CN105740550B - The emulation mode of fastening connection piece in belt anchorage point intensive analysis - Google Patents
The emulation mode of fastening connection piece in belt anchorage point intensive analysis Download PDFInfo
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- CN105740550B CN105740550B CN201610070427.8A CN201610070427A CN105740550B CN 105740550 B CN105740550 B CN 105740550B CN 201610070427 A CN201610070427 A CN 201610070427A CN 105740550 B CN105740550 B CN 105740550B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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Abstract
The invention discloses a kind of emulation modes of fastening connection piece in belt anchorage point intensive analysis, divide this method comprises: fastening connection piece to be carried out to grid model as a whole to obtain physical grid unit；Involucrum is carried out to the outer surface of fastening connection piece to handle to create shell unit；Cross section is created at connecting rod, and pre-tight stress is applied to cross section；Beam element is created to the mounting hole of connecting rod and each connector；Relationship is welded according to the actual welding information creating of the connector on the attaching nut and vehicle body of fastening connection piece；The shell unit creation first of shell unit and each connector to fastening connection piece is from contact, and the beam element creation second of the mounting hole of the beam element and each connector to connecting rod contacts certainly, to simulate the interaction situation between fastening connection piece and connector.This method can more actually simulate the welding relationship and interaction of the pretensioning effect of fastening connection piece, fastening connection piece and connector in belt anchorage point intensive analysis.
Description
Technical field
The present invention relates to fastening connection pieces in automobile technical field more particularly to a kind of belt anchorage point intensive analysis
Emulation mode.
Background technique
GB 14167-2013 " car belt installation fixed point, the fixed dot system of ISOFIX and upper drawstring fixed point " is
One important indicator of vehicle passive safety is the project of conducting a compulsory examination of vehicle bulletin test, for any a vehicle,
It all must be special consideration should be given to.The regulation is to ensure that safety belt can provide enough guarantors to occupant during high velocity impact
Shield, applied load is very high to Structural strength calls, and therefore, effective research method is all constantly sought by major automobile factory
Its structural strength is improved, so being just particularly important in simulation analysis of the design phase to its structural strength.Pass through finite element
Method simulation test procedure, finds the problem, and solves the problems, such as ahead of time in the design phase, avoids a large amount of actual tests, saves
Development cost shorten the development cycle.
In the case where bearing fixed point test load, the intensity of belt anchorage point must assure that safety belt must not be from peace
Dress fixed point falls off, but allows to install fixed point and its peripheral region generation permanent deformation or crackle, stipulated that top is effective
The forward direction displacement of fixed point must not exceed certain range.Safety belt installs fixed point generally by the way of bolt-connection, and
Common failure mode is exactly bolt location due to bolt hole stress deformation in belt anchorage point test, and material is caused to tear
Or bolt is deviate to lead to test failure from hole.In simulation analysis in the related art, accurate it cannot but simulate
The deformation pattern of bolt peripheral structure thus greatly reduces the accuracy of belt anchorage point Strength Simulation result.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
Purpose is to propose a kind of emulation mode of fastening connection piece in belt anchorage point intensive analysis, which can be serious
The welding relationship and fastening connection piece and connection of the real pretensioning effect for simulating fastening connection piece, fastening connection piece and connector
The interaction of part improves the accuracy of belt anchorage point Strength Simulation result.
To achieve the goals above, it is fastenedly connected in the belt anchorage point intensive analysis of first aspect present invention embodiment
The emulation mode of part, the fastening connection piece are described imitative to clamp the connector on the connector and vehicle body on safety belt
True method the following steps are included: carry out grid model division for the fastening connection piece, to obtain physical grid list as a whole
Member；Involucrum processing is carried out to the outer surface of the fastening connection piece, with the outer surface of the fastening connection piece create one layer with
The corresponding shell unit of the physical grid unit；At the connecting rod of the fastening connection piece create cross section, and along perpendicular to
The direction of the cross section applies pre-tight stress to the cross section, to simulate the pretensioning effect of the fastening connection piece；To institute
Connecting rod creation beam element is stated, and beam element is created to the mounting hole of each connector；According to the connection of the fastening connection piece
Attaching nut described in the actual welding information creating of connector on nut and the vehicle body and the connector on the vehicle body it
Between welding relationship；The shell unit creation first of shell unit and each connector to the outer surface of the fastening connection piece connects certainly
Touching, and the beam element creation second of the mounting hole of the beam element and each connector to the connecting rod contacts certainly, to simulate
State the interaction situation between fastening connection piece and the multiple connector.
The emulation mode of fastening connection piece in belt anchorage point intensive analysis according to an embodiment of the present invention, can pacify
Welding entirely with the pretensioning effect, fastening connection piece and connector for more actually simulating fastening connection piece in fastened point intensity analysis
The interaction of relationship and fastening connection piece and connector fastens when more truly reproducing belt anchorage point strength test
Connector peripheral structure deformation pattern, improves the accuracy of vehicle simulation test operating condition in security performance development process, from
And helps to save vehicle security energy development cost and shorten the development cycle.
In one embodiment of the invention, the fastening connection piece includes bolt and the attaching nut, wherein described
Bolt includes bolt head and the connecting rod.
In one embodiment of the invention, the physical grid unit is the physical grid unit based on hexahedron.
In one embodiment of the invention, the pre-tight stress σ is obtained by following formula:
Mt=K × Po × d,
σ=Po/S,
Wherein, σ indicates that the pre-tight stress, Mt indicate pre-fastening moment, and force coefficient is tightened in K expression, and Po indicates pretightning force, d
Indicate that screw thread nominal diameter, S indicate the area of the cross section at the connecting rod.
In one embodiment of the invention, the shell unit of the fastening connection piece, the beam element of the connecting rod and institute
The beam element for stating the mounting hole of connector is sky material beam element, wherein the sky material is MAT9 material.
In one embodiment of the invention, the material of the physical grid unit is metal MAT24 material.
In one embodiment of the invention, the pre-tight stress is preset by calling first in finite element analysis tool
Crucial word command is applied.
In one embodiment of the invention, the welding relationship between the connector on the attaching nut and the vehicle body
By calling the second preset keyword order in finite element analysis tool to be created.
In one embodiment of the invention, described first is pre- by the third in calling finite element analysis tool from contact
If crucial word command is created, described second passes through the 4th default key in the calling finite element analysis tool from contact
Word command is created.
Detailed description of the invention
Fig. 1 is the emulation mode of fastening connection piece in belt anchorage point intensive analysis according to an embodiment of the invention
Flow chart；
Fig. 2 is the overall structure diagram of bolt simulation model according to an embodiment of the invention；
Fig. 3 is the when m- stress curve schematic diagram of tools for bolts ' pretension accord to a specific embodiment of that present invention；
Fig. 4 is the beam element of the beam element of connecting rod accord to a specific embodiment of that present invention and the mounting hole of connector
Schematic diagram；
Fig. 5 is MAT24 used by the physical grid unit of fastening connection piece accord to a specific embodiment of that present invention
The load-deformation curve schematic diagram of material.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
The emulation of fastening connection piece in the belt anchorage point intensive analysis of the embodiment of the present invention is described with reference to the accompanying drawing
Method.
Fig. 1 is the emulation mode of fastening connection piece in belt anchorage point intensive analysis according to an embodiment of the invention
Flow chart.Wherein, fastening connection piece is to clamp the connector on the connector and vehicle body on safety belt.What installation took
Connector can be one or more, and the connector on vehicle body is also possible to one or more.
As shown in Figure 1, in the belt anchorage point intensive analysis of the embodiment of the present invention fastening connection piece emulation mode, packet
Include following steps:
Fastening connection piece is carried out grid model division by S1 as a whole, to obtain physical grid unit.
In one embodiment of the invention, fastening connection piece includes bolt and the attaching nut that is used cooperatively with bolt,
Wherein, bolt includes bolt head and connecting rod.
Specifically, bolt grid model is divided according to practical bolt arrangement first: simple process is carried out to practical bolt, it will
Bolt head, screw rod (i.e. connecting rod) and attaching nut divide as a whole, are divided into the entity based on hexahedron
Grid cell, cell size about 4mm.Wherein, Fig. 2 show the overall structure diagram of bolt simulation model.
Involucrum is carried out to bolt entirety outer surface, i.e., creates one layer in bolt outer surface and passes through node with physical grid unit
The shell unit that fusion (one of finite element analysis connection method) is attached.
In one embodiment of the invention, wherein the corresponding part of the connecting rod in physical grid unit is along connection
The axial direction of bar is row's solid element.
That is, the connecting rod means suitable in physical grid unit is divided into row's entity along screw rod axial direction
Unit, i.e. corresponding two nodes of connection bar part, to improve the subsequent accuracy for applying pre-tight stress.
In one embodiment of the invention, the material of physical grid unit is using in finite element analysis tool LS-DYNA
Metal material MAT24 material.
S2 carries out involucrum processing to the outer surface of fastening connection piece, with the outer surface of fastening connection piece create one layer with
The corresponding shell unit of physical grid unit.
Specifically, involucrum is carried out to the outer surface of fastening connection piece entirety, i.e., creates one layer in fastening connection piece outer surface
Merge what (node fusion refers to one of finite element analysis connection method) be attached by node with physical grid unit
Shell unit.
In addition, also creating shell unit for each connector that fastening connection piece is clamped.
In one embodiment of the invention, shell unit is using the empty material MAT9 material in LS-DYNA.
S3 creates cross section at the connecting rod of fastening connection piece, and applies along the direction perpendicular to cross section to cross section
Add pre-tight stress, to simulate the pretensioning effect of fastening connection piece.
Specifically, the general purpose of bolt-connection is that two or more connectors are clamped together.Chucking power
It is realized by applying torque to bolt head and nut, the mechanical advantage of spanner and screw thread makes it possible to tensile bolt head and nut
Between bolt part (also referred to as screw rod, i.e., connecting rod described in the text), this produces pulling force in bolt, the pulling force quilt
Referred to as pretightning force.Therefore before any other power is applied to bolt-connection, it be there is.Pretightning force by bolt head,
Nut and any gasket being likely to occur are transmitted on the connector matched, so for more accurate simulating Safety band fixed point
Strength test need to add pretightning force to bolt.
In one embodiment of the invention, pre-tight stress σ is obtained by following formula:
Mt=K × Po × d N.m,
σ=Po/S,
Wherein, σ indicates that pre-tight stress, Mt indicate pre-fastening moment, and force coefficient is tightened in K expression, and Po indicates pretightning force, and d is indicated
Screw thread nominal diameter, the area of the cross section at S connecting rod for indication.
In one particular embodiment of the present invention, K=0.24 can be obtained by being tabled look-up according to bolt situation；And safe strap bolt is pre-
Clamp force square is generally 45 ± 5N.m of standard value, and the diameter of bolt is generally 10mm, so bolt pretightening Po are as follows:
Po=45N.m/0.24/10mm=45 × 1000N.mm/0.24/10mm=18750N,
So, the pre-tight stress of the cross section of connecting rod are as follows:
σ=Po/S=Po/ π/r/r=18750N/ π/5mm/5mm=238.8N/mm2=238.8MPa,
σ=240MPa can be taken.
In one embodiment of the invention, pre-tight stress is by calling the in finite element analysis tool first default key
Word command is applied.
Wherein, the first preset keyword order is the initial cross-section stress keyword in finite element analysis tool LS-DYNA
Order * INITIAL_STRESS_SECTION.
Specifically, using LS-DYNA method, a cross section is created at screw rod, using crucial word command * INITIAL_
STRESS_SECTION, applies the pre-tight stress of σ=240MPa by the cross section, and direction is tight to simulate perpendicular to cross section
Be connected the pretensioning effect of fitting, wherein tools for bolts ' pretension when m- stress curve as shown in figure 3, the chronomere in Fig. 3 is ms,
Unit of stress is GPa.
S4 creates beam element to connecting rod, and creates beam element to the mounting hole of each connector.
In one embodiment of the invention, the beam element of the mounting hole of the beam element of connecting rod and each connector is
Empty material beam element, wherein empty material is MAT9 material.
Specifically, bolt hole (i.e. mounting hole) periphery of screw rod (i.e. connecting rod) outer surface and each connector is created respectively
Beam element is built, using the empty material MAT9 material of LS-DYNA.Wherein, the beam of the mounting hole of the beam element and connector of connecting rod
Unit as shown in figure 4, in Fig. 4 the vertical line connecting rod for indication of arrow meaning beam element, the horizontal direction of arrow meaning in Fig. 4
Circle indicates the beam element of the mounting hole of connector.
Wherein, the empty material beam element created to the mounting hole of connecting rod and connector, the diameter of beam element are set
Set pattern then are as follows: be subject between the beam element of connecting rod and the beam element of mounting hole and do not penetrate, the beam element of connecting rod with
Connecting rod solid element is attached in connection rod outer surface by node fusion, the beam element of mounting hole and the shell list of connector
Member is attached on mounting hole periphery by node fusion.
S5, according to the actual welding information creating attaching nut of the connector on the attaching nut and vehicle body of fastening connection piece
Welding relationship between the connector on vehicle body.
In one embodiment of the invention, the welding relationship between the connector on attaching nut and vehicle body passes through calling
The second preset keyword order in finite element analysis tool is created.
Wherein, the second preset keyword order is that key word command * CONSTRAINED_ is welded in the pressure in LS-DYNA
GENERALIZED_WELD。
Specifically, it for automotive safety strap bolt, usually by nut-welding on vehicle body, is then installed again.?
That is the connector on attaching nut and vehicle body is welded to together, it, will be on safety belt by bolt when safety belt is installed
Connector and vehicle body on connector clamp.It is therefore desirable to according to the actual welding information of welded nut and connector, butt welding
Connected nut and connector create welding relationship.
More specifically, according to the actual welding information of the connector on welded nut and vehicle body, using the * of LS-DYNA
CONSTRAINED_GENERALIZED_WELD method is created.
The shell unit creation first of S6, shell unit and each connector to the outer surface of fastening connection piece contact certainly, and
The mounting hole of beam element and each connector to connecting rod beam element creation second from contact, with simulate fastening connection piece with
Interaction situation between connector.
In one embodiment of the invention, it first is closed from contact by calling the third in finite element analysis tool to preset
Key word command is created, and second is created from contact by the 4th preset keyword order in calling finite element analysis tool
It builds.
Wherein, the order of third preset keyword is that the face in LS-DYNA contacts key word command * CONTACT_ certainly
AUTOMATIC_SINGLE_SURFACE；4th preset keyword order is common from the crucial word command * of contact in LS-DYNA
CONTACT_AUTOMATIC_GENERAL。
Specifically, contact relation setting, i.e. the shell list in fastening connection piece outer surface are carried out using finite element analysis tool
The shell unit of first and all connectors creates one from contacting, to the beam element and each connector mounting hole of connection rod outer surface
Beam element create one from contact.
It is connect certainly more specifically, the shell unit of shell unit and all connectors to fastening connection piece outer surface creates one
Touching, is created, simulation is fastenedly connected using the * CONTACT_AUTOMATIC_SINGLE_SURFACE method in LS-DYNA
The interaction of part and connector；The beam element of beam element and all connector mounting holes to connection rod outer surface creates one
From contact, created using the * CONTACT_AUTOMATIC_GENERAL method in LS-DYNA, to simulate fastening connection piece
With the interaction of connector.
In addition, it is necessary to which explanation, MAT9 material parameter above are set as conventional arrangement；The entity of fastening connection piece
The load-deformation curve of MAT24 material used by grid cell uses the load-deformation curve of actually used material,
Wherein, load-deformation curve is as shown in Figure 5.
By with real train test Comparative result, it was demonstrated that, can be calibrated using the simulation method of the embodiment of the present invention
The practical distortion mode of true simulation bolt peripheral structure in belt anchorage point strength test, effectively improves vehicle in safety
The accuracy of simulation test operating condition during performance development, and it is easy to use, simulation precision is high, effectively save computing resource,
Improve finite element stimulation efficiency.
The emulation mode of fastening connection piece through the foregoing embodiment can be established in belt anchorage point intensive analysis
Play bolt model, fully consider bolt pretightening apply, bolt and connector welding relationship and bolt and connector it is mutual
Effect, bolt peripheral structure deformation pattern when more truly reproducing belt anchorage point strength test are belt anchorage point
The accuracy of Strength Simulation result is laid a good foundation.Meanwhile this emulation mode exploitativeness is strong, it is made to be applied to safety belt
It is possibly realized in fastened point intensity simulation analysis model, helps to save vehicle security energy development cost and shortens exploitation week
Phase.
In conclusion in the belt anchorage point intensive analysis of the embodiment of the present invention fastening connection piece emulation mode, can
More actually to simulate the pretensioning effect, fastening connection piece and connector of fastening connection piece in belt anchorage point intensive analysis
Welding relationship and fastening connection piece and connector interaction, more truly reproduce belt anchorage point strength test
When fastening connection piece peripheral structure deformation pattern, improve vehicle in security performance development process simulation test operating condition it is accurate
Property, to help to save vehicle security energy development cost and shorten the development cycle.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (8)
1. the emulation mode of fastening connection piece in a kind of belt anchorage point intensive analysis, which is characterized in that described to be fastenedly connected
For part to clamp the connector on the connector and vehicle body on safety belt, the fastening connection piece includes bolt and connection spiral shell
It is female, wherein the bolt includes bolt head and connecting rod, the emulation mode the following steps are included:
The fastening connection piece is subjected to grid model division as a whole, to obtain physical grid unit；
Involucrum processing is carried out to the outer surface of the fastening connection piece, with the outer surface of the fastening connection piece create one layer with
The corresponding shell unit of the physical grid unit；
Cross section is created at the connecting rod of the fastening connection piece, and along the direction perpendicular to the cross section to described transversal
Face applies pre-tight stress, to simulate the pretensioning effect of the fastening connection piece；
Beam element is created to the connecting rod, and beam element is created to the mounting hole of each connector；
Connect according to actual welding information creating of the attaching nut of the fastening connection piece with the connector on the vehicle body
Welding relationship between connector on connected nut and the vehicle body；
The shell unit creation first of shell unit and each connector to the outer surface of the fastening connection piece contacts certainly, and to institute
The beam element creation second of the beam element of connecting rod and the mounting hole of each connector is stated from contacting, to be fastenedly connected described in simulation
Interaction situation between part and connector.
2. the emulation mode of fastening connection piece in belt anchorage point intensive analysis as described in claim 1, which is characterized in that
The physical grid unit is the physical grid unit based on hexahedron.
3. the emulation mode of fastening connection piece in belt anchorage point intensive analysis as described in claim 1, which is characterized in that
The pre-tight stress σ is obtained by following formula:
Mt=K × Po × d,
σ=Po/S,
Wherein, σ indicates that the pre-tight stress, Mt indicate pre-fastening moment, and force coefficient is tightened in K expression, and Po indicates pretightning force, and d is indicated
Screw thread nominal diameter, S indicate the area of the cross section at the connecting rod.
4. the emulation mode of fastening connection piece in belt anchorage point intensive analysis as described in claim 1, which is characterized in that
The beam element of the mounting hole of the shell unit of the fastening connection piece, the beam element of the connecting rod and the connector is sky material
Expect beam element, wherein the sky material is MAT9 material.
5. the emulation mode of fastening connection piece in belt anchorage point intensive analysis as described in claim 1, which is characterized in that
The material of the physical grid unit is metal MAT24 material.
6. the emulation mode of fastening connection piece in belt anchorage point intensive analysis as described in claim 1, which is characterized in that
The pre-tight stress is by calling the first preset keyword order in finite element analysis tool to be applied.
7. the emulation mode of fastening connection piece in belt anchorage point intensive analysis as described in claim 1, which is characterized in that
Welding relationship between connector on the attaching nut and the vehicle body is by calling second in finite element analysis tool
Preset keyword order is created.
8. the emulation mode of fastening connection piece in belt anchorage point intensive analysis as described in claim 1, which is characterized in that
Described first is created from contact by the third preset keyword order in calling finite element analysis tool, and described second certainly
Contact is by calling the 4th preset keyword order in the finite element analysis tool to be created.
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| CN107563085A (en) * | 2017-09-12 | 2018-01-09 | 国电联合动力技术有限公司 | The finite element modeling method and strength assessment method of a kind of high-strength bolt attachment structure |
| CN111324981A (en) * | 2020-02-19 | 2020-06-23 | 上汽大众汽车有限公司 | Finite element modeling method for modal calculation of safety belt retractor |
| CN111444654B (en) * | 2020-04-07 | 2022-04-01 | 中国汽车工程研究院股份有限公司 | Virtual simulation method for judging bolt fracture under collision working condition |
| CN111695277A (en) * | 2020-05-15 | 2020-09-22 | 中国第一汽车股份有限公司 | Simulation method of hot-melting self-tapping joint |
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