CN110727989B - Structural fatigue strength analysis method, device and computer readable storage medium - Google Patents
Structural fatigue strength analysis method, device and computer readable storage medium Download PDFInfo
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Abstract
The invention provides a finite element analysis method, an analysis device and a computer readable storage medium for structural fatigue strength, which have small calculation amount and accurate calculation result. The method is used for analyzing the fatigue strength of the structure of the railway locomotive component under a plurality of working conditions and generating a finite element model of the analysis object; based on stress calculation of a node of the finite element model under each working condition in the specified working conditions, obtaining the maximum principal stress and the minimum principal stress of each node of the finite element model under all working conditions; and based on the maximum main stress and the minimum main stress, calculating average stress and stress amplitude, and judging whether the fatigue strength of the analysis object meets the safety requirement or not through a Goldman fatigue limit diagram.
Description
Technical Field
The present invention relates to the field of finite element analysis of fatigue strength of a structure of a railroad locomotive component, and more particularly, to a method and apparatus for finite element analysis of fatigue strength of a structure of a railroad locomotive component, and a computer-readable storage medium.
Background
Railway rolling stock is taken as a main transportation means, and has the advantages of large transportation capacity, low energy consumption, low transportation cost, safety and convenience, and is popular in society. With the continuous increase of the running speed and the load of a train, in order to improve the performance of a locomotive, the working load and the vibration impact energy of a bearing structure are reduced, and the bearing structure of the locomotive is designed by adopting a lightweight technology successively. With frequent occurrence of fatigue failure events of heavy loads and speed increasing and quasi-high speed and high speed train bearing structures at home and abroad, the problem of fatigue reliability of railway rolling stock structures becomes more and more prominent. On the basis of developing material fatigue theory research, various countries in the world widely develop engineering assessment methods of structural fatigue strength suitable for actual conditions of the country. Therefore, the method for rapidly and effectively analyzing the structural fatigue strength of the locomotive components can ensure safe operation of the locomotive and greatly improve the research and development capability of new products of enterprises.
In the prior art, in a finite element method for analyzing the fatigue strength of a locomotive component structure, a load and a constraint corresponding to each of a plurality of working conditions are generally superimposed and applied to an analysis object at the same time, then stress components of each node are calculated, and the maximum principal stress, the minimum principal stress, the average stress and the stress amplitude of each node are calculated according to the obtained stress components, and then fatigue strength analysis is performed by using a goodman curve. In the prior art, the load and the constraint corresponding to the superposition of each working condition are applied to each node, and because the load and the constraint are vectors, the magnitude of the load and the constraint obtained after the superposition may be smaller than that of the load and the constraint under a certain working condition, so that the maximum principal stress, the minimum principal stress, the average stress and the stress amplitude obtained in the prior art cannot truly reflect the stress condition of the component structure, for example, the condition that the maximum principal stress obtained after a plurality of working conditions are superposed is smaller than the first principal stress under a certain working condition exists, and thus the inaccuracy of the fatigue strength analysis is caused. Moreover, in case a subsequent increase of the operating conditions is required, it is difficult to simply superimpose the operating conditions by means of the solutions of the prior art.
In addition, when fatigue strength analysis is performed on a locomotive component structure, when a plurality of members exist in an analysis object, there are cases where geometric models of the plurality of members of the analysis object are respectively established, and then the geometric models of the plurality of members are combined, so that overlapping geometric boundaries exist in the obtained combined geometric model of the analysis object, and problems such as large calculation amount, calculation errors, inaccurate calculation results and the like are likely to occur in subsequent processes such as meshing, load and constraint application, calculation and the like.
In the past, when fatigue strength analysis is performed on a locomotive component structure, there is a case where a plurality of members to be analyzed are respectively meshed, then the meshed members are combined together, and a weld joint is created, and in this case, mesh joint contact pairs exist between bodies or faces where the meshed members are in contact with each other. If finite element analysis is performed on such grid nodes in the prior art, firstly, the process of applying load and constraint to the grid nodes becomes complex, the operation amount increases, and secondly, the stress between the contact pairs obtained after calculation becomes incoherent, and the actual stress condition of the analysis object cannot be reflected.
In addition, at present, when fatigue strength analysis is performed on a locomotive component structure, weld joints are usually required to be created, so that the problems of complex modeling, large operation amount, limitation by grid cell types and the like exist.
Disclosure of Invention
The present invention has been made in view of the above-described problems.
The invention aims to provide a finite element analysis method for the fatigue strength of a railway locomotive component structure, which can solve the problems that the maximum principal stress, the minimum principal stress, the average stress and the stress amplitude obtained after the load and the constraint of each working condition are overlapped in the prior art can not truly reflect the stress condition of the component structure, and the working conditions are difficult to be simply overlapped when the working conditions are required to be added later.
Another object of the present invention is to provide a method for finite element analysis of fatigue strength of a structure of a railway locomotive component, which can solve the problems of large calculation amount, calculation errors, inaccurate calculation results, etc. in the prior art, which are caused by a geometric model of an analysis object obtained by combining geometric models of a plurality of components.
The invention further aims to provide a finite element analysis method for the fatigue strength of the structure of the railway locomotive component, which can solve the problems that in the prior art, the process of applying load and constraint to grid nodes is complicated and the operation amount is increased due to the need of creating weld joints, the stress between contact pairs obtained after calculation becomes incoherent, the real stress condition of an analysis object cannot be reflected, and the like.
A first aspect of the present invention is a method for finite element analysis of structural fatigue strength for analyzing structural fatigue strength of a railroad locomotive component under a plurality of specified conditions, comprising the steps of: generating a finite element model of the analysis object; based on stress calculation of each node of the finite element model under each working condition in the specified working conditions, obtaining the maximum principal stress and the minimum principal stress of each node of the finite element model under all working conditions; and based on the maximum main stress and the minimum main stress, calculating average stress and stress amplitude, and judging whether the fatigue strength of the analysis object meets the safety requirement or not through a Goldman fatigue limit diagram.
According to the method for finite element analysis of the fatigue strength of the structure of the railway locomotive component, which is disclosed by the invention, the analysis can be carried out according to the stress conditions of the analysis object under each working condition of the specified working conditions respectively instead of the stress conditions after all the specified working conditions are overlapped, so that the comprehensive stress conditions of the analysis object can be truly reflected, and according to the method, multi-working condition overlapping can be easily carried out without adding excessive operation amount, and the method has the advantages of simplicity, small required operation amount and high analysis efficiency.
Preferably, the specified working conditions are all working conditions applied to the analysis object.
According to the invention, the stress conditions of the analysis object under all working conditions can be considered, and the comprehensive stress condition of the analysis object can be reflected more truly.
Preferably, generating the finite element model of the analysis object comprises: establishing the geometric model of the analysis object in a mode of sharing geometric boundaries, and meshing the geometric model to generate a finite element model of the analysis object.
Preferably, generating the finite element model of the analysis object comprises: establishing the geometric model of the analysis object, and meshing the geometric model in a mode of sharing grid nodes to generate a finite element model of the analysis object.
According to the invention, the optimization is performed when the geometric model is created or the grids are divided, so that the number of grid nodes required to be divided can be reduced, and the method has the advantages of being simple, small in required operation amount and high in analysis efficiency. Moreover, the invention does not need to create weld joints and is not limited by the type of grid cells.
Preferably, based on stress calculation of each node of the finite element model under each of the specified working conditions, the calculating the maximum principal stress and the minimum principal stress of each node of the finite element model under all the working conditions includes: and respectively calculating a group of principal stresses of each node of the finite element model according to each working condition in the specified working conditions, wherein the group of principal stresses comprises a first principal stress, a second principal stress and a third principal stress, the largest first principal stress in the first principal stresses in all groups is taken as the largest principal stress, the smallest third principal stress in the third principal stresses in all groups is taken as the smallest principal stress, and the sign representing the tensile and compression state of each principal stress is unchanged.
According to the invention, the maximum stress range of each node in the finite element model of the analysis object is considered, namely, in a group of principal stresses known in the prior art, the magnitude relation of the three principal stresses is that the first principal stress is equal to or greater than the second principal stress is equal to or greater than the third principal stress, so that the maximum first principal stress in all the group of principal stresses is selected as the maximum principal stress, and the minimum third principal stress in all the group of principal stresses is selected as the minimum principal stress, thereby obtaining the fatigue strength analysis with the highest safety.
Preferably, based on the stress calculation of each node of the finite element model under each of the specified working conditions, the calculating the maximum principal stress and the minimum principal stress of each node of the finite element model under all the working conditions includes: calculating a set of principal stresses for each of the nodes of the finite element model, the set of principal stresses including a first principal stress, a second principal stress, and a third principal stress, respectively, for each of the specified conditions; taking the direction of the largest first principal stress in the first principal stress of all groups of principal stresses of each node as a first reference direction, taking the direction of the largest second principal stress in the second principal stress of all groups of principal stresses of each node as a second reference direction, respectively projecting the first principal stress, the second principal stress and the third principal stress in a group of principal stresses under each working condition to the first reference direction and the second reference direction, respectively calculating the stress ranges after projection in the first reference direction and the second reference direction, respectively, determining the largest stress range in all stress ranges, taking the principal stress with the largest code value in the largest stress range as the largest principal stress, and taking the stress projection value with the smallest code value in the largest stress range as the smallest principal stress.
According to the invention, the stress conditions under all working conditions are considered, the comprehensive stress condition of the analysis object can be truly reflected, and the fatigue strength analysis of the structure of the stress object can be more accurately carried out.
Preferably, the stress component and the set of principal stresses of each node under each of the specified conditions are automatically extracted by a secondary development plug-in.
According to the invention, the automatic extraction of data can be realized by developing the special plug-in for the second time.
Preferably, the fatigue strength risk area is checked by a secondary development plug-in display analysis object stress cloud map based on the stress amplitude and the average stress of each node of the finite element model.
According to the invention, visual display of analysis results can be realized through secondary development of the special plug-in.
A second aspect of the present invention is a finite element analysis device for analyzing fatigue strength of a structure of a railroad locomotive component under a plurality of working conditions, comprising: a first module that generates a finite element model of the analysis object; the second module is used for calculating the maximum principal stress and the minimum principal stress of each node of the finite element model under all working conditions based on the stress calculation of each node of the finite element model under each working condition in the specified working conditions; and the third module is used for calculating average stress and stress amplitude based on the maximum principal stress and the minimum principal stress, and judging whether the fatigue strength of the analysis object meets the safety requirement or not through a Goldmann fatigue limit diagram.
A third aspect of the present invention is a computer readable storage medium having stored thereon a computer program for analyzing fatigue strength of a structure of a railroad locomotive component under a plurality of operating conditions under execution of a processor of the computer program, the computer program when executed by the processor implementing the steps of: generating a finite element model of the analysis object; based on stress calculation of each node of the finite element model under each working condition in the specified working conditions, obtaining the maximum principal stress and the minimum principal stress of each node of the finite element model under all working conditions; and based on the maximum main stress and the minimum main stress, calculating average stress and stress amplitude, and judging whether the fatigue strength of the analysis object meets the safety requirement or not through a Goldman fatigue limit diagram.
According to the invention of the second aspect and the third aspect of the present invention, in analyzing the fatigue strength of the structure of the railway locomotive component, the stress condition of the analysis object under each working condition can be analyzed, the comprehensive stress condition of the analysis object can be truly reflected, and the multiplex condition superposition can be easily performed without additionally increasing excessive calculation amount, so that the method has the advantages of simplicity, small required calculation amount and high analysis efficiency.
Drawings
Fig. 1 is a schematic flow chart of an embodiment of the present invention.
FIG. 2 is a schematic diagram of a finite element model shared mesh node of an embodiment of the present invention.
Fig. 3 is a schematic diagram of a stress cloud after secondary development of an embodiment of the invention.
Fig. 4A to 4C are schematic diagrams for calculating maximum stress and minimum stress according to another embodiment of the present invention.
Wherein reference numerals are as follows:
1: mounting plate
2: board board
3: bending plate
Detailed Description
The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which specific embodiments of the invention are shown, and in which it is evident that the embodiments shown are shown, by way of illustration only, in one, but not all embodiments of the invention. The present invention is not to be construed as limited in any way by the embodiments set forth herein, and all other embodiments, which can be made by those of ordinary skill in the art without undue burden, are intended to be within the scope of the present invention.
Hereinafter, a finite element analysis method for analyzing the fatigue strength of a structure of a railroad locomotive component under a plurality of working conditions will be described by taking as an example a finite element analysis method for fatigue strength of a structure of a locomotive calculus removing and sand scattering device. Fig. 1 is a schematic flow chart of the above embodiment of the present invention, and fig. 2 is a schematic diagram of a finite element model shared mesh node of the above embodiment of the present invention.
As shown in fig. 2, the locomotive stone-removing and sand-spreading device in the present embodiment is configured as an analysis object composed of three members, i.e., a mounting plate 1, a plate 2, and a bending plate 3.
Referring to fig. 1, the present embodiment includes the steps of:
a first step of generating a finite element model of a structure of a locomotive stone-removing and sand-spreading device as an analysis object, the finite element model including a plurality of nodes.
In specific implementation, the geometric models of the three components of the mounting plate 1, the plate 2 and the bending plate 3 can be established in advance, then the geometric models of the three components are combined together in a shared boundary mode, the geometric model of the analysis object is established, and then the geometric is subjected to grid division, so that the finite element model of the analysis object is generated.
Examples of the manner of sharing the boundary include the following two embodiments.
In one embodiment, a geometric model of the analysis object is built in a manner of sharing geometric boundaries, and then the geometric model is subjected to grid division to generate a finite element model of the analysis object. Specifically, when the geometric model is built, a plurality of bodies may be taken as a whole to build such that there is no contact pair between each body, for example, there is generally a pair of contact surfaces between the two bodies when connecting the plate 2 and the bent plate 3, but in this embodiment, only one of the contact surfaces is reserved as a surface boundary shared by the two bodies, for example, there is a pair of contact lines when connecting the two surfaces, only one of the contact lines is reserved as a line boundary shared by the two surfaces, and so on. The manner of sharing boundaries between various geometric elements, including volumes, planes, lines, points, not specifically recited, is also common. Then, the geometric model without contact pairs is subjected to grid division, so that the finally obtained finite element model is free of contact pairs, namely, repeated grid nodes are not present, the operation amount can be reduced, and the analysis efficiency can be improved.
In another embodiment, a geometric model of the analysis object is established, and the geometric model is meshed in a mode of sharing the mesh nodes, so that a finite element model of the analysis object is generated. Specifically, geometric models of three members of the mounting plate 1, the plate 2 and the bending plate 3 are established in advance, the geometric models of the three members are combined together in a usual manner, that is, contact pairs still exist in the geometric model at this time, and then grids are divided in a manner of sharing grid nodes, so as to generate a finite element model of an analysis object. As a method of sharing the mesh node, for example, as shown in fig. 2, when the plate 2 and the bending plate 3 are connected, a pair of contact surfaces are present, and the mesh node is shared between the pair of contact surfaces. The manner of sharing the mesh node boundaries between various geometric elements, including volumes, planes, lines, points, not specifically recited, is also common. Therefore, the finally obtained finite element model has no contact pairs, namely no repeated grid nodes, so that the operation amount can be reduced, and the analysis efficiency can be improved.
And a second step of calculating the maximum principal stress and the minimum principal stress of each node of the finite element model under all working conditions based on the stress calculation of each node of the finite element model under each working condition in the appointed working conditions.
In specific implementation, the locomotive stone-removing and sand-spreading device as the analysis object has a plurality of working conditions, and when the finite element analysis of fatigue strength is performed, a specified working condition can be selected for analysis, for example, the specified working condition can be all working conditions applied to the analysis object, can be other working conditions after the working conditions which do not influence or have weak influence on the analysis object are eliminated, and can be a specific working condition specified by an analysis personnel.
Different working conditions correspond to different loads and/or constraints, the loads and constraints corresponding to each working condition are respectively applied to the finite element model of the analysis object, and stress components of each node of the finite element model under each working condition are respectively calculated, wherein the stress components comprise sigma x 、σ y 、σ z 、τ xy 、τ yz 、τ zx A set of principal stresses for each node of the finite element model under each operating condition is then determined from the stress components, the set of principal stresses including a first principal stress sigma 1 Second principal stress sigma 2 Third principal stress sigma 3 Wherein σ is 1 ≥σ 2 ≥σ 3 And includes signs representing the pull-down state of each principal stress.
In addition, in the present embodiment, the stress component σ of each node under each of the specified conditions may be automatically extracted by the secondary development plug-in x 、σ y 、σ z 、τ xy 、τ yz 、τ zx A set of principal stresses.
The present invention provides two embodiments, but is not limited to the following, when calculating the maximum principal stress and the minimum principal stress of each node of the finite element model under all conditions based on the stress calculation of each node of the finite element model under each of the specified conditions.
In one embodiment, as an analytical pairThe structure of the stone-removing and sand-spreading device of the locomotive is provided with a plurality of working conditions, for convenience of explanation, the conditions of the designated working conditions are taken as working condition 1 and working condition 2, and a group of principal stresses obtained by a certain node under the working condition 1 comprise a first principal stress sigma 11 Second principal stress sigma 12 Third principal stress sigma 13 The set of principal stresses obtained by the node under condition 2 includes a first principal stress sigma 21 Second principal stress sigma 22 Third principal stress sigma 23 Wherein, if sigma 11 ＞σ 21 、σ 13 ＞σ 23 Then sigma is taken 11 Maximum principal stress sigma of the node under all working conditions max Sigma is calculated as 23 As the minimum principal stress sigma of the node under all conditions min . It should be noted that the sign of the pull-press state representing each principal stress is always unchanged.
In another embodiment, the locomotive stone-removing and sand-spreading device as the analysis object has a plurality of working conditions, and for convenience of explanation, the conditions of working condition 1 and working condition 2 are designated. The main stress of a certain node obtained under the working condition 1 is sigma 11 、σ 12 Sigma (sigma) 13 The main stress of the node obtained under the working condition 2 is sigma 21 、σ 22 Sigma (sigma) 23 . Assuming that σ in the first principal stress under all specified (here two) conditions of the node 11 Is the maximum first principal stress sigma 1max And all of the second principal stresses σ under the specified (here two) operating conditions 12 Is the maximum second principal stress sigma 2max . At this time, the maximum first principal stress sigma 1max (i.e. sigma) 11 ) Takes the direction of the maximum second principal stress sigma as the first reference direction 2max (i.e. sigma) 12 ) Is used as a second reference direction.
Then, for this node, a set of principal stresses σ under regime 1 11 、σ 12 、σ 13 Set of principal stresses sigma for condition 2 21 、σ 22 、σ 23 Projected to the first reference direction and the second reference direction respectively, and calculated on the first baseAnd the stress range after projection in the quasi-direction and the second reference direction, wherein the sign of the pulling and pressing state representing each main stress is unchanged in the projection process.
Since the principal stresses within a set of principal stresses are perpendicular to each other, a set of principal stresses σ under condition 1 11 、σ 12 、σ 13 A set of principal stresses sigma under condition 2 21 、σ 22 、σ 23 At the maximum first principal stress sigma respectively 1max (i.e. sigma) 11 ) The projection of the direction of (a) is sigma 11 、0、0、σ’ 21 、σ’ 22 、σ’ 23 Obviously, the maximum value in the set of projections is σ 1max (i.e. sigma) 11 ) In addition, compare 0, sigma' 21 、σ’ 22 、σ’ 23 After which it is assumed that sigma' 23 The value of (2) is smallest, the projection range of each stress in the first reference direction is (sigma' 23 ,σ 11 ). Similarly, a set of principal stresses σ under condition 1 11 、σ 12 、σ 13 A set of principal stresses sigma under condition 2 21 、σ 22 、σ 23 At the maximum second principal stress sigma respectively 2max (i.e. sigma) 12 ) Projection of direction of 0, sigma 12 、0、σ” 21 、σ” 22 、σ” 23 Obviously, the maximum value in the set of projections is σ 2max (i.e. sigma) 12 ) In addition, compare 0, sigma' 21 、σ” 22 、σ” 23 Thereafter assume σ' 21 The projection range of each stress in the second reference direction is (sigma' 21 ,σ 12 )。
Assume that is (sigma' 21 ,σ 12 ) Is greater than (sigma' 21 ,σ 12 ) Will (sigma' 21 ,σ 12 ) Determining as the largest projection range of the projection ranges of stresses in the two reference directions, at this time, σ 12 Determining the maximum principal stress sigma of the node under all working conditions max Sigma is' 21 Determining the minimum principal stress sigma of the node under all working conditions min 。
And thirdly, based on the maximum principal stress and the minimum principal stress, calculating average stress and stress amplitude, and judging whether the fatigue strength of the analysis object meets the safety requirement or not through a Goldman fatigue limit diagram.
Obtaining the maximum principal stress sigma of a certain node under all working conditions according to the method of the second step max And the minimum principal stress sigma of the node under all working conditions min Thereafter, the average stress sigma of the node is calculated m Wherein σ is m ＝(σ max +σ min )/2；
And, calculate the stress amplitude sigma of the node a Wherein σ is a ＝(σ max -σ min )/2。
And (3) for each grid node, obtaining the maximum principal stress, the minimum principal stress, the average stress and the stress amplitude of each node for all working conditions according to the method.
Finally, based on the obtained average stress and stress amplitude of each node, judging whether the fatigue strength of the analysis object meets the safety requirement or not by utilizing the Goldman fatigue limit diagram.
In particular implementation, the average stress σ of each node obtained in the third step may be based on m Stress amplitude sigma a The stress cloud image to be analyzed is displayed by the secondary development plug-in to view the fatigue strength risk region, and for example, the stress cloud image shown in fig. 3 is obtained, and by viewing fig. 3, it can be easily determined that the portion where the stress is greatest in the locomotive stone removing and sanding device of the present embodiment is the end of one through hole in the plate 2.
In addition, in another embodiment of the present invention, the present invention relates to a fatigue strength analysis device for a structure of a railroad car component, wherein the processing performed in each functional module in the device corresponds to the content described in the finite element analysis method concerning the fatigue strength of the structure of the railroad car component, and the description thereof is omitted herein.
In addition, in another embodiment of the present invention, a computer-readable storage medium has stored thereon a computer program that, when executed by a processor of a computer, analyzes the fatigue strength of a structure of a railroad locomotive component under a plurality of working conditions according to the content described in the finite element analysis method regarding the fatigue strength of a structure of a railroad locomotive component, and specific processing steps are not described herein.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It is to be understood that the invention is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (9)
1. A method for finite element analysis of structural fatigue strength, comprising the steps of:
generating a finite element model of the analysis object;
based on stress calculation of each node of the finite element model under each working condition in the specified working conditions, obtaining the maximum principal stress and the minimum principal stress of each node of the finite element model under all working conditions; and
based on the maximum principal stress and the minimum principal stress, average stress and stress amplitude are obtained, whether the fatigue strength of the analysis object meets the safety requirement is judged through a Goldman fatigue limit diagram,
based on stress calculation of each node of the finite element model under each working condition in the specified working conditions, the obtaining of the maximum principal stress and the minimum principal stress of each node of the finite element model under all working conditions comprises:
for each of the specified conditions, separately calculating a set of principal stresses for each of the nodes of the finite element model, the set of principal stresses including a first principal stress, a second principal stress, and a third principal stress,
taking the direction of the largest first principal stress in the first principal stress of all groups of principal stresses of each node as a first reference direction, taking the direction of the largest second principal stress in the second principal stress of all groups of principal stresses of each node as a second reference direction, respectively projecting the first principal stress, the second principal stress and the third principal stress in a group of principal stresses under each working condition to the first reference direction and the second reference direction, respectively calculating the stress ranges after projection in the first reference direction and the second reference direction, respectively, determining the largest stress range in all stress ranges, taking the principal stress with the largest code value in the largest stress range as the largest principal stress, and taking the stress projection value with the smallest code value in the largest stress range as the smallest principal stress.
2. The method of finite element analysis of structural fatigue strength according to claim 1, wherein the specified operating conditions are all operating conditions applied to the analysis object.
3. The method of finite element analysis of structural fatigue strength according to claim 1, wherein generating a finite element model of the analysis object includes:
establishing a geometric model of the analysis object in a mode of sharing geometric boundaries, and performing grid division on the geometric model to generate a finite element model of the analysis object.
4. The method of finite element analysis of structural fatigue strength according to claim 1, generating a finite element model of the analysis object comprising:
and establishing a geometric model of the analysis object, and meshing the geometric model in a mode of sharing grid nodes to generate a finite element model of the analysis object.
5. The method of claim 1, wherein the calculating the maximum principal stress and the minimum principal stress of each node of the finite element model under all conditions based on the stress calculation of each node of the finite element model under each of the specified conditions, respectively, comprises:
and respectively calculating a group of principal stresses of each node of the finite element model according to each working condition in the specified working conditions, wherein the group of principal stresses comprises a first principal stress, a second principal stress and a third principal stress, the largest first principal stress in the first principal stresses in all groups is taken as the largest principal stress, the smallest third principal stress in the third principal stresses in all groups is taken as the smallest principal stress, and the sign representing the tensile and compression state of each principal stress is unchanged.
6. The method of finite element analysis of structural fatigue strength according to claim 1, wherein the stress component and a set of principal stresses for each node under each of the specified conditions are automatically extracted by a secondary development plug-in.
7. The method of finite element analysis of structural fatigue strength according to claim 1, wherein the fatigue strength risk area is viewed by a secondary development plug-in display analysis object stress cloud based on the stress amplitude and average stress of each node of the finite element model.
8. A finite element analysis device for structural fatigue strength, comprising:
a first module for generating a finite element model of the analysis object;
the second module is used for calculating the maximum principal stress and the minimum principal stress of each node of the finite element model under all working conditions based on the stress calculation of each node of the finite element model under each working condition in the specified working conditions; and
a third module for obtaining average stress and stress amplitude based on the maximum principal stress and the minimum principal stress, judging whether the fatigue strength of the analysis object meets the safety requirement through a Goldman fatigue limit diagram,
based on stress calculation of each node of the finite element model under each working condition in the specified working conditions, the obtaining of the maximum principal stress and the minimum principal stress of each node of the finite element model under all working conditions comprises:
for each of the specified conditions, separately calculating a set of principal stresses for each of the nodes of the finite element model, the set of principal stresses including a first principal stress, a second principal stress, and a third principal stress,
taking the direction of the largest first principal stress in the first principal stress of all groups of principal stresses of each node as a first reference direction, taking the direction of the largest second principal stress in the second principal stress of all groups of principal stresses of each node as a second reference direction, respectively projecting the first principal stress, the second principal stress and the third principal stress in a group of principal stresses under each working condition to the first reference direction and the second reference direction, respectively calculating the stress ranges after projection in the first reference direction and the second reference direction, respectively, determining the largest stress range in all stress ranges, taking the principal stress with the largest code value in the largest stress range as the largest principal stress, and taking the stress projection value with the smallest code value in the largest stress range as the smallest principal stress.
9. A computer readable storage medium having stored thereon a computer program for analyzing fatigue strength of a structure of a railroad locomotive component under execution of a processor of the computer, the computer program when executed by the processor performing the steps of:
generating a finite element model of the analysis object;
based on stress calculation of each node of the finite element model under each working condition in the specified working conditions, obtaining the maximum principal stress and the minimum principal stress of each node of the finite element model under all working conditions; and
based on the maximum principal stress and the minimum principal stress, average stress and stress amplitude are obtained, whether the fatigue strength of the analysis object meets the safety requirement is judged through a Goldman fatigue limit diagram,
based on stress calculation of each node of the finite element model under each working condition in the specified working conditions, the obtaining of the maximum principal stress and the minimum principal stress of each node of the finite element model under all working conditions comprises:
for each of the specified conditions, separately calculating a set of principal stresses for each of the nodes of the finite element model, the set of principal stresses including a first principal stress, a second principal stress, and a third principal stress,
taking the direction of the largest first principal stress in the first principal stress of all groups of principal stresses of each node as a first reference direction, taking the direction of the largest second principal stress in the second principal stress of all groups of principal stresses of each node as a second reference direction, respectively projecting the first principal stress, the second principal stress and the third principal stress in a group of principal stresses under each working condition to the first reference direction and the second reference direction, respectively calculating the stress ranges after projection in the first reference direction and the second reference direction, respectively, determining the largest stress range in all stress ranges, taking the principal stress with the largest code value in the largest stress range as the largest principal stress, and taking the stress projection value with the smallest code value in the largest stress range as the smallest principal stress.
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