CN102410957A - Test sample and method for testing performance parameters of pipe under complex stress state - Google Patents
Test sample and method for testing performance parameters of pipe under complex stress state Download PDFInfo
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- CN102410957A CN102410957A CN2011102092748A CN201110209274A CN102410957A CN 102410957 A CN102410957 A CN 102410957A CN 2011102092748 A CN2011102092748 A CN 2011102092748A CN 201110209274 A CN201110209274 A CN 201110209274A CN 102410957 A CN102410957 A CN 102410957A
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Abstract
The invention relates to a test sample and method for testing performance parameters of a pipe under the complex stress state. A common uniaxial tension arc-shaped test sample is processed into an arc-shaped test sample with an elliptical hole. The center line of a long shaft of the elliptical hole is in superposition with a center line in the length direction of the uniaxial tension arc-shaped test sample; and the center of the circle of the elliptical hole is in superposition with the center of the shape of the arc-shaped tension test sample with the elliptical hole. Two sections of pipe compressed test samples are cut out along the axial direction of the pipe to be tested. The verticality of the cross section of each pipe compressed test sample to the axial line of the pipe is 0.08-0.1, and the degree of roughness of the cross section of each pipe compressed test sample is 0.8-0.2. The tension testing is performed on the arc-shaped tension test sample with the elliptical hole, the axial compression testing is performed on the pipe compressed test samples, the lateral compression testing is performed on the pipe compressed test samples and reverse engineering is further performed on obtained force-displacement data, thereby testing the performance parameters of the pipe under the complex stress state.By adopting the whole set of test sample for testing the performance parameters of the pipe under the complex stress state and the testing method, the testing precision and the efficiency of the performance parameters of the pipe are improved.
Description
Technical field
The present invention relates to a kind of sample and method of testing that is used for mechanical properties of tubular goods parameter under the testing complex stress state in the tube plastic forming technical field.
Background technology
The tubing member has obtained increasingly extensive attention and application owing to can satisfy an urgent demand to aspects such as product lightweight, Strengthening and Toughening in high-tech sectors such as automobile, aerospaces.Tubing is in forming processes such as hydraulic expanding-forming and numerical control bending; Its plastic flow and deformational behavior are very complicated; The complex stress that tubing receives two-way drawing/press loads; And in order to formulate reasonable technological and to realize the accurate values modeling analysis, pressing for acquisition can reflect accurately that tubing is two-way and draw/material property parameter under the compressive stress state.
At present; The pipe performance parameter acquiring method mainly comprises traditional unilateral stretching, hoop stretching (patent: " pipe hoop stress tensility testing method "; 1865906), cross stretching (patent: " a kind of test specimen of realizing two-way tension and compression coupling stress state through unilateral stretching " open (bulletin) number:; Open (bulletin) number: 101430263) and hydraulic expanding-forming (patent: " hydraulic expanding-forming threeway supercharging device " discloses (bulletin) number: 201783556U).Traditional piping material unilateral stretching sample designs according to State Standard of the People's Republic of China's " metal material tensile test at room temperature method " GB/T228-2002; The sample two ends are retained parts; The distorted area of test is in the middle part; Thereby method of testing is to make it under unidirectional tensile stress state, produce distortion to obtain the response of unilateral stretching plasticity until fracture, and this method can't obtain to reflect that tubing draws in the complicacy of actual plastic forming process/mechanical property characteristic under the compressive stress state; The hoop tensile sample is that intercepted length is the annulus of 1～50mm from the tubing; To have the inwall that first semi-round bar and second semi-round bar with ring specimen internal diameter same diameter pass ring specimen then; The two ends of first semi-round bar link to each other with the last anchor clamps of material stretch test machine through second connector; The two ends of second semi-round bar link to each other with the lower clamp of material stretch test machine through second connector; Stretching makes ring specimen generation stretcher strain obtain the Erichsen test data, and in process of the test, there are the accuracy of frictional influence data in annular sample and semi-round bar; And need measure the different test mould of Design and Machining to different size tubing, its testing cost is higher; The outline of cross tensile sample is octagon, is symmetrical set two circular holes at the two ends than long central axis of sample, is used to load the anchor clamps of cupping machine; Be symmetrical set four holes that seamlessly transit in the central area of sample, make the centre of sample present the right-angled intersection shape, two surfaces up and down at right-angled intersection position, sample central area are through the polishing attenuation; Its test method also is to stretch through common cupping machine to obtain ess-strain; Because the right-angled intersection position is thin and yielding, receives the plane stress strain regime, can obtain the plane plasticity response; The right-angled intersection sample needs special shape design and processing; Its cost of manufacture is high, and the deflection of cross part is difficult to confirm that the result is accurate inadequately in output in the process of the test; The sample of hydraulic expanding-forming is one section pipe with certain-length; Its supercharging device comprises shaping die, end mould, vane pump and pipeline up and down; Its mould and equipment are comparatively special; Defective such as have that mould structure is complicated, testing cost is high, test performance difficulty and material parameter are difficult to confirm, and can only obtain the thick anisotropy index of minor caliber pipe.
Therefore; There are restrictions such as sample design and processed complex, testing cost height and test result be inaccurate in sample and the method for testing that more than is used for the test material performance parameter; Need to seek and a kind ofly can be used for testing tubing and draw/sample and the method for testing of performance parameter under the compressive stress in complicacy; Make the acquisition of pipe performance parameter more convenient effectively, this is that the moulding precision machining of current tubing efficiently is shaped and makes the key issue that presses for solution.
Summary of the invention
Can not accurately obtain the performance parameter of tubing under complex stress condition in order to overcome the sample and the method for testing that exist in the prior art comprehensively; Thereby influence the problem of design of tubing plastic forming process and forming process analysis of finite element by numerical simulation precision, the present invention proposes a kind of sample and method of testing that is used for pipe performance parameter under the testing complex stress state.
The present invention is processed with ellipse hole on unilateral stretching arc sample commonly used, form band elliptical aperture arc tensile sample; The major axis of the elliptical aperture on the described band elliptical aperture arc tensile sample is 2.5～5mm, and minor axis is 1.5～3mm; The center line of the elliptical aperture major axis on the described band elliptical aperture arc tensile sample and the central lines of being with elliptical aperture arc tensile sample length direction; The center of circle of said elliptical aperture overlaps with the centre of form of band elliptical aperture arc tensile sample.
The invention allows for the method for pipe performance parameter under a kind of testing complex stress state, may further comprise the steps:
Step 3, test sample.Test process comprises the extension test of band elliptical aperture arc tensile sample, the axial compression test of tubing compression sample and the lateral compression test of tubing compression sample, and its detailed process does.
The test of I band elliptical aperture arc tensile sample.Band elliptical aperture arc tensile sample is clamped on the anchor clamps of cupping machine, with vertical extensometer clamping on sample.Through the displacement tensile sample of cupping machine upper grip, the loading velocity of cupping machine is 3mm/min.Stretching distance is the distance of initial position when breaking with elliptical aperture arc tensile sample of cupping machine upper grip.Obtain power-displacement data in the drawing process, till sample is broken.
The axial compression test of II tubing compression sample.Through cupping machine a tubing compression sample is done the axial compression test.Through the displacement compression sample of cupping machine upper grip, test is carried out along the axis of pipeline section sample, and compression distance is 70mm, and loading velocity is 3mm/min.Obtain power-displacement data in the axial compression process.
The lateral compression test of III tubing compression sample.Through cupping machine another tubing compression sample is done the lateral compression test.The axis normal of compression direction and sample, compression distance are 85mm, and loading velocity is 3mm/min.Obtain power-displacement data in the lateral compression process.
Power-the displacement data that obtains in the extension test of I with band elliptical aperture arc tensile sample, set up power-transposed matrix [Y] with three groups of power-displacement datas that obtain in the axial compression test of tubing compression sample and the lateral compression test.
The analog matrix of II computing power-displacement [Y0]: the finite element model of setting up the extension test of band elliptical aperture arc tensile sample; Set up the finite element model of the axial compression test of tubing compression sample; Set up the finite element model of the lateral compression test of tubing compression sample.
The initial parameter of described three finite element models is respectively: band elliptical aperture arc tensile sample adopts unilateral stretching, and tubing compression sample adopts axial compression and lateral compression respectively.When said sample was adopted unilateral stretching or axial compression or lateral compression, initial power and displacement were 0, and loading velocity is 3mm/min.The amount of tension of band elliptical aperture arc tensile sample is to be with the drawing crack of elliptical aperture arc tensile sample, and the axial compression amount of tubing compression sample is 70mm, and the lateral compression amount of tubing compression sample is 85mm.
The original material parameter of said three samples is respectively strength factor K, hardenability value n and thick anisotropy index r, and this strength factor K, hardenability value n and thick anisotropy index r are through the one directional tensile test acquisition of unilateral stretching arc sample commonly used in the prior art.
Utilize the explicit finite element of ABAQUS that the finite element model of the lateral compression test of the finite element model of the axial compression test of the finite element model of the extension test of band elliptical aperture arc tensile sample, tubing compression sample and tubing compression sample is carried out analog computation, obtain the analog matrix [Y of three groups of power-displacements
0].
III is to three groups of power-shift simulation matrix [Y
0] be optimized calculating respectively:
Confirm objective function.Through formula Φ=∑ (Y-Y
0)
2W
iObtain objective function Φ.Wherein, W
iBe weighting coefficient, its span is 0.001～0.01.Φ is the function desired value.
Set Φ
kOptimal objective value for objective function.Optimal objective value Φ with desired value Φ and objective function
kCompare: if Φ≤Φ
kSet up, obtain power-displacement data [Y respectively
0'], counter asking calculated end.If Φ≤Φ
kBe false, then adopt optimized Algorithm such as genetic algorithm that original material parameter K, n, the r of the II in the step 4 carried out parameter optimization.With the original material parameter K after optimizing, n, r original material parameter as the II in the step 4; Set up the finite element model of lateral compression test of finite element model and tubing compression sample of axial compression test of finite element model, the tubing compression sample of the extension test of band elliptical aperture arc tensile sample once more, and to three groups of power-displacement [Y
0] be optimized calculating, up to Φ≤Φ
k, counter asking calculated end, finally obtains pipe performance parameter under the complex stress condition.
The folk prescription that the material parameter that common atresia arc tensile sample extension test obtains only shows the specimen length direction is to the tension strain; The complicacy that can't obtain meeting in the moulding process of tubing is drawn/compressive stress; The unreasonable analog result that makes is inaccurate owing to the original material parameter is provided with to cause follow-up bending pipes finite element analogy, can't objectively respond tubing actual flexion process.The band elliptical aperture arc tensile sample of the present invention's design is to beat elliptical aperture in the heart at the row of common atresia arc tensile sample, forces sample stress in drawing process to be concentrated and produces the plane stress strain; Tubing compression sample is the direct pipeline section of intercepting from the tubing, and the compression through axial or side direction produces complicated compression stress strain.The band elliptical aperture arc tensile sample test of the present invention's design is to load through unilateral stretching; Can induce the elliptical aperture skirt materials and produce the plane stress strain; The major axis of elliptical aperture and the dead in line of sample simultaneously; Have bigger range of strain compared with circular hole, resulting material parameter meets the suffered plane stress strain attribute in the bending pipes outside in the moulding process of tubing more; The test of the tubing compression sample of the present invention's design is the compression-loaded through axial or side direction; The axial compression test of tubing compression sample is through sample is carried out the simple physics axial compression; Force tubular product sample to produce the compression unstability; Can produce fold after the sample compression unstability, progressively compression-loaded bending pipes inboard unstability in the process of unstability and the tube plastic forming is wrinkling similar by initial compression zero condition for this; The lateral compression test of tubing compression sample is to flatten through sample being carried out the simple physics side direction; Tubing compression sample lateral compression test plastic yield the best part concentrates on the center section of the lateral compression direction of tubular product sample; In plastic history; This a part of neutral line outside receives tension, the inboard compression chord of neutral line, and the place, summit receives two-way tension.
Induce different stress-strain states through the band elliptical aperture arc tensile sample of the present invention's design and the physical test loading of simply drawing/press of the common cupping machine of tubing compression sample process; Meet the complex stress in the moulding process of tubing more; And then, can obtain a kind of pipe performance parameter under the testing complex stress-strain state that is used for through inverse problem of parameter.The sample and the method for testing of pipe performance parameter will further improve the precision and the efficient of pipe performance parameter testing under a whole set of testing complex stress-strain state.
Description of drawings
Fig. 1 is an atresia arc tensile sample front view;
Fig. 2 is a band elliptical aperture arc tensile sample front view;
Fig. 3 is a band elliptical aperture arc tensile sample vertical view;
Fig. 4 is the elliptical aperture enlarged drawing on the band elliptical aperture arc tensile sample;
Fig. 5 is a band elliptical aperture arc tensile sample 3-D view;
Fig. 6 is a tubing compression sample three-dimensional plot;
Fig. 7 is band elliptical aperture arc tensile sample test philosophy figure, and wherein, F is the holding force of mould holding sample, and N is the pulling force of die drawn sample; As shown in the figure, lower chuck is equipped with mould on the testing machine, and F is the clamping force that mould imposes on band elliptical aperture arc tensile sample bare terminal end, guarantees that sample sample bare terminal end and mould in drawing process do not produce skidding; N is the pulling force of die drawn sample, and mould clamps the back with sample and moves along the sample axis direction, reaches the effect that sample is stretched;
Fig. 8 is axial compression test philosophy figure, and wherein, F is that the testing machine compressed platform is to compression sample applied pressure; As shown in Figure 8, compression verification is to carry out in the compression test district of testing machine, relies on the compressed platform of testing machine itself that sample is compressed successfully, and the F that is narrated is that the compressed platform of testing machine is to compressing the sample applied pressure;
Fig. 9 is lateral compression test philosophy figure, and wherein, F is that the testing machine pressing plate is to compression sample applied pressure;
Figure 10 is the process flow diagram of pipe performance parameter test method under the complex stress condition;
Figure 11 is band elliptical aperture arc tensile sample test meridional stress cloud atlas and legend;
Figure 12 is band elliptical aperture arc tensile sample test transverse stress cloud atlas and legend;
The stress cloud atlas and the legend of peripheral force when Figure 13 is 1.5s;
The stress cloud atlas and the legend of axial force when Figure 14 is 1.5s;
Plastic strain cloud atlas and legend when Figure 15 is 1.5s;
Figure 16 is axial compression plastic strain analog result cloud atlas and legend;
Figure 17 is the stress cloud atlas and the legend of lateral compression peripheral force when 20s;
Figure 18 is the stress cloud atlas and the legend of lateral compression transverse force when 20s;
Figure 19 is lateral compression plastic strain cloud atlas and legend when 20s;
Figure 20 lateral compression plastic strain analog result cloud atlas and legend.Wherein:
1. the centre of form 2. elliptical apertures 3. elliptical aperture inwalls 4. focuses 5. major axis
6. minor axis 7. tubing compress sample cross
Embodiment
The present invention is a kind of sample that is used for pipe performance parameter under the testing complex stress state, realizes pipe performance parameter under the testing complex stress state through band elliptical aperture arc tensile sample and tubing compression sample.Described band elliptical aperture arc tensile sample is to obtain after unilateral stretching arc sample commonly used in the prior art is improved; Described tubing compression sample is the pipeline section along tubing axis direction to be tested intercepting.The caliber D that tests tubing of the present invention is 30～200mm; Be processed with an ellipse hole on the used unilateral stretching arc sample, and the major axis of said ellipse hole is 2.5～5mm, minor axis is 1.5～3mm; Tubing compression sample is that edge tubing axis direction intercepted length to be tested is the pipeline section of 100mm.The present invention is that 100mm, major axis are that 3mm, minor axis are 2mm with the caliber D of tubing to be tested, and the compression specimen length is that 100mm is an example, and practical implementation process of the present invention is described.
Present embodiment is a kind of sample that is used for pipe performance parameter under the testing complex stress state.The tubing of being tested is the 6061-O aluminium-alloy pipe, and specification is Φ 100 * 1.5mm.
Present embodiment is realized pipe performance parameter under the testing complex stress state through band elliptical aperture arc tensile sample and tubing compression sample.Described band elliptical aperture arc tensile sample is to obtain after unilateral stretching sample commonly used in the prior art is improved; Described tubing compression sample is the pipeline section along tubing axis direction to be tested intercepting.The described band elliptical aperture of present embodiment arc tensile sample is ellipse hole of processing on the unilateral stretching sample centre of form, and the major axis of this ellipse hole is 3mm, and minor axis is 2mm; Tubing compression sample is that edge tubing axis direction intercepted length to be tested is the pipeline section of 100mm.The center line of the elliptical aperture major axis on the described band elliptical aperture arc tensile sample and the central lines of being with elliptical aperture arc tensile sample length direction; The center of circle of said elliptical aperture overlaps with the centre of form of band elliptical aperture arc tensile sample
The test process of present embodiment may further comprise the steps:
Drilling on the unilateral stretching arc sample commonly used in the prior art.Mark the centre of form 1 of unilateral stretching arc sample with normal line method.With the described centre of form 1 is that the center of circle major axis 5 that on sample, draws is that 3mm, minor axis 6 are the ellipse of 2mm.The parallel axes of long axis of ellipse 5 and sample.With the centre of form 1 is that the circular hole less than ellipse short shaft 6 is bored in the center of circle, is used for the tungsten filament of threading cutting; Go out elliptical aperture 2 through the line cutting processing.With sand paper elliptical aperture inwall 3 is polished smooth, require roughness to reach 0.8～0.2.
Adopting the method for line cutting, is the pipeline section of 100mm along tubing axial direction to be tested intercepting two segment length, obtains two tubing compression samples.Described tubing compression sample cross 7 is 0.08～0.1 with the verticality of tube's axis, and the roughness of tubing compression sample cross 7 is 0.8～0.2, and tubing compression sample surfaces externally and internally can not have defectives such as cut, sand holes.
Step 3, test sample.
Test process comprises extension test, axial compression test and lateral compression test, and its detailed process is:
The test of I band elliptical aperture arc tensile sample.The extension test of band elliptical aperture arc is on cupping machine, to carry out.Band elliptical aperture arc tensile sample is clamped on the anchor clamps of cupping machine, with vertical extensometer clamping on sample.Displacement tensile sample through the cupping machine upper grip.Stretching displacement be the initial position of cupping machine upper grip when breaking with elliptical aperture arc tensile sample apart from obtaining power-displacement data in the drawing process, till sample is broken.In the test, the loading velocity of cupping machine is 3mm/min.The force transducer inner through testing machine dynamically shows tensile force, through the displacement of vertical extensometer demonstration sample marking distance section, through the power-displacement data of 30 pairs/second of testing machine automatic signal acquisition system collections.
The axial compression test of II tubing compression sample.Through cupping machine a tubing compression sample is done the axial compression test.Through the displacement compression sample of cupping machine upper grip, test is carried out along the axis of pipeline section sample, and the compression distance of tubing compression sample is 70mm, and loading velocity is 3mm/min; Obtain power-displacement data in the axial compression process.Dynamically show force of compression through testing machine internal forces sensor,, gather power-displacement data of 30 pairs/second, be compressed 70mm until sample through testing machine automatic signal acquisition system through the displacement of displacement transducer demonstration sample marking distance section.
The lateral compression test of III tubing compression sample.Through cupping machine another tubing compression sample is done the lateral compression test.The axis normal of compression direction and sample, the compression distance of tubing compression sample is 85mm; Loading velocity is 3mm/min; Obtain power-displacement data in the lateral compression process.Dynamically show force of compression through testing machine internal forces sensor,, gather power-displacement data of 30 pairs/second, be compressed 85mm until sample through testing machine automatic signal acquisition system through the displacement of displacement transducer demonstration sample marking distance section.
The anti-essence of asking of material parameter is to ask the material parameter of tubing is counter through optimized Algorithm, and the power-displacement data that analog result obtained of the finite element model that the finite element model of the finite element model of the extension test of feasible band elliptical aperture arc tensile sample, the axial compression test of tubing compression sample and the lateral compression of tubing compression sample are tested approaches test findings.The described anti-process of asking is following:
Three groups of power-displacement datas that obtain in the lateral compression test of I with the axial compression test of the extension test of band elliptical aperture arc tensile sample, tubing compression sample and tubing compression sample are set up power-transposed matrix [Y] respectively;
Analog matrix [the Y of II computing power-displacement
0]: utilize ABAQUS software to set up the axial compression test finite element model of the extension test finite element model of band elliptical aperture arc tensile sample, tubing compression sample and the lateral compression test finite element model of tubing compression sample.To be with elliptical aperture arc tensile sample to carry out unilateral stretching, and tubing compressed sample carry out axial compression and lateral compression respectively.
The initial parameter of described three finite element models is respectively: will be with elliptical aperture arc tensile sample to carry out unilateral stretching, and tubing compressed sample carry out axial compression and lateral compression respectively.When said sample was adopted unilateral stretching or axial compression or lateral compression, initial power and displacement were 0, and loading velocity is 3mm/min; The amount of tension of band elliptical aperture arc tensile sample is to be with the drawing crack of elliptical aperture arc tensile sample, and the axial compression amount of tubing compression sample is 70mm, and the lateral compression amount of tubing compression sample is 85mm.
The original material parameter of said three samples is respectively strength factor K, hardenability value n and thick anisotropy index r, and this strength factor K, hardenability value n and thick anisotropy index r are through the one directional tensile test acquisition of unilateral stretching arc sample commonly used in the prior art.
Utilize the explicit finite element of ABAQUS that the finite element model of the lateral compression test of the finite element model of the axial compression test of the finite element model of the extension test of band elliptical aperture arc tensile sample, tubing compression sample and tubing compression sample is carried out analog computation, obtain the analog matrix [Y of three groups of power-displacements
0].
III is to three groups of power-shift simulation matrix [Y
0] be optimized calculating respectively:
Confirm objective function.Through formula Φ=∑ (Y-Y
0)
2W
iObtain objective function Φ; Wherein, W
iBe weighting coefficient, its span is 0.001～0.01, and Φ is the function desired value.
Set Φ
kOptimal objective value for objective function.Optimal objective value Φ with desired value Φ and objective function
kCompare: if Φ≤Φ
kSet up, obtain power-displacement data [Y respectively
0'], counter asking calculated end.If Φ≤Φ
kBe false, then adopt optimized Algorithm such as genetic algorithm that original material parameter K, n, the r of the II in the step 4 carried out parameter optimization; With the original material parameter K after optimizing, n, r original material parameter, utilize ABAQUS software to set up elliptical aperture stretching, axial compression and three finite element models of lateral compression once more, and be [Y three groups of power-displacements as the II in the step 4
0] be optimized calculating, up to Φ≤Φ
k, counter asking calculated end.In the present embodiment, through to three groups of power-shift simulation matrix [Y
0] carry out four suboptimization calculating, finally obtain pipe performance parameter under the complex stress condition.
Table 1: the pipe performance parameter under the two-way tensile stress state (corresponding band elliptical aperture arc tensile sample extension test result)
Table 2: the pipe performance parameter under the compressive stress state (corresponding tubing compression sample axial compression test result)
Table 3: the pipe performance parameter under the compressive stress state (corresponding tubing compression sample lateral compression test result)
Annotate: K representes strength of materials coefficient, and n representes the material hardenability value, and r representes the thick anisotropy index of material
Claims (3)
1. a sample that is used for pipe performance parameter under the testing complex stress state is characterized in that, on unilateral stretching arc sample commonly used, is processed with ellipse hole, forms band elliptical aperture arc sample; The major axis of the elliptical aperture on the described band elliptical aperture arc sample is 2.5～5mm, and minor axis is 1.5～3mm; The center line of the elliptical aperture major axis on the described band elliptical aperture arc sample and the central lines of being with elliptical aperture arc sample length direction; The center of circle of said elliptical aperture overlaps with the centre of form of band elliptical aperture arc sample.
2. the method through pipe performance parameter under the said sample testing complex stress condition of claim 1 is characterized in that, may further comprise the steps:
Step 1, preparation band elliptical aperture arc sample; The roughness of said elliptical aperture inwall is 0.8～0.2;
Step 2, preparation tubing compression sample; Along tubing axial direction to be tested intercepting two segment length is the pipeline section of 100mm, obtains two tubing compression samples; The verticality of described tubing compression sample cross and tube's axis is 0.08～0.1, and the roughness of tubing compression sample cross is 0.8～0.2;
Step 3, test sample; Test process comprises the extension test of band elliptical aperture arc tensile sample, the axial compression test of tubing compression sample and the lateral compression test of tubing compression sample, and its detailed process is:
The test of I band elliptical aperture arc tensile sample; Band elliptical aperture arc tensile sample is clamped on the anchor clamps of cupping machine, with vertical extensometer clamping on sample; Through the displacement tensile sample of cupping machine upper grip, the loading velocity of cupping machine is 3mm/min; Stretching distance is the distance of initial position when breaking with elliptical aperture arc tensile sample of cupping machine upper grip; Obtain power-displacement data in the drawing process, till sample is broken;
The axial compression test of II tubing compression sample; Through cupping machine a tubing compression sample is done the axial compression test; Through the displacement compression sample of cupping machine upper grip, test is carried out along the axis of pipeline section sample, and compression distance is 70mm, and loading velocity is 3mm/min; Obtain power-displacement data in the axial compression process;
The lateral compression test of III tubing compression sample; Through cupping machine another tubing compression sample is done the lateral compression test; The axis normal of compression direction and sample, compression distance are 85mm, and loading velocity is 3mm/min; Obtain power-displacement data in the lateral compression process;
Step 4, the counter of material parameter asked; Ask the material parameter of tubing is counter through finite element analogy, make stretching, axial compression and three power-displacement datas that finite element analogy obtained of lateral compression approach test findings; The described anti-process of asking is following:
Power-the displacement data that obtains in the extension test of I with band elliptical aperture arc tensile sample, set up power-transposed matrix [Y] with three groups of power-displacement datas that obtain in the axial compression test of tubing compression sample and the lateral compression test;
Analog matrix [the Y of II computing power-displacement
0]: the finite element model of setting up the extension test of band elliptical aperture arc tensile sample; Set up the finite element model of the axial compression test of tubing compression sample; Set up the finite element model of the lateral compression test of tubing compression sample;
The initial parameter of described three finite element models is respectively: band elliptical aperture arc tensile sample adopts unilateral stretching, and tubing compression sample adopts axial compression and lateral compression respectively; When said sample was adopted unilateral stretching or axial compression or lateral compression, initial power and displacement were 0, and loading velocity is 3mm/min; The amount of tension of band elliptical aperture arc tensile sample is to be with the drawing crack of elliptical aperture arc tensile sample, and the axial compression amount of tubing compression sample is 70mm, and the lateral compression amount of tubing compression sample is 85mm;
The original material parameter of said three samples is respectively strength factor K, hardenability value n and thick anisotropy index r, and this strength factor K, hardenability value n and thick anisotropy index r are through the one directional tensile test acquisition of unilateral stretching arc sample commonly used in the prior art;
Utilize the explicit finite element of ABAQUS that the finite element model of the lateral compression test of the finite element model of the axial compression test of the finite element model of the extension test of band elliptical aperture arc tensile sample, tubing compression sample and tubing compression sample is carried out analog computation, obtain the analog matrix [Y of three groups of power-displacements
0];
III is to three groups of power-shift simulation matrix [Y
0] be optimized calculating respectively:
Confirm objective function; Through formula Φ=∑ (Y-Y
0)
2W
iObtain objective function Φ; Wherein, W
iBe weighting coefficient, its span is 0.001～0.01; Φ is the function desired value;
Set Φ
kOptimal objective value for objective function; Optimal objective value Φ with desired value Φ and objective function
kCompare: if Φ≤Φ
kSet up, obtain power-displacement data [Y respectively
0'], counter asking calculated end; If Φ≤Φ
kBe false, then adopt optimized Algorithm such as genetic algorithm that original material parameter K, n, the r of the II in the step 4 carried out parameter optimization; With the original material parameter K after optimizing, n, r original material parameter as the II in the step 4, set up elliptical aperture stretching, axial compression and three finite element models of lateral compression once more, and to three groups of power-displacement [Y
0] be optimized calculating, up to Φ≤Φ
k, counter asking calculated end, finally obtains pipe performance parameter under the complex stress condition.
3. like the said a kind of sample that is used for pipe performance parameter under the testing complex stress state of claim 2, it is characterized in that, on the unilateral stretching arc sample, during drilling, mark the centre of form of unilateral stretching arc sample with normal line method; With the described centre of form is that the center of circle is oval on sample.
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| CN103698212A (en) * | 2013-12-24 | 2014-04-02 | 哈尔滨工业大学 | Method for directly measuring circumferential normal anisotropy coefficient of pipe |
| CN103954505A (en) * | 2014-05-19 | 2014-07-30 | 哈尔滨工业大学 | Method for testing nonlinear constitutive relationship of composite laminates in thickness direction |
| RU2525153C1 (en) * | 2013-03-21 | 2014-08-10 | Российская Федерация, от имени которой выступает Министерство промышленности и торговли Российской Федерации (Минпромторг России) | Reference sample with monitored distribution of stresses through thickness |
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| CN110763568A (en) * | 2019-11-28 | 2020-02-07 | 大连理工大学 | Method for determining thickness anisotropy coefficient of pipe in any direction |
| CN110763567A (en) * | 2019-11-28 | 2020-02-07 | 大连理工大学 | Method for measuring thickness anisotropy coefficient and yield stress of pipe in any direction |
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| CN107478475B (en) * | 2017-07-25 | 2019-11-08 | 东北大学 | A kind of design method of the simple tension sample of the poor thick plate mechanics behavior of characterization rolling |
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| CN108507876A (en) * | 2018-04-03 | 2018-09-07 | 江苏科泰检测技术服务有限公司 | Aluminum steel composite material mechanical properties detection method |
| CN110333137A (en) * | 2019-08-16 | 2019-10-15 | 西北工业大学 | A kind of thin-walled plate tube material compression performance test sample, fixture and method |
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| CN110763568B (en) * | 2019-11-28 | 2021-05-07 | 大连理工大学 | Method for determining thickness anisotropy coefficient of pipe in any direction |
| RU2792195C1 (en) * | 2022-08-19 | 2023-03-20 | Федеральное автономное учреждение "Центральный аэрогидродинамический институт имени профессора Н.Е. Жуковского" (ФАУ "ЦАГИ") | Method for determining the effect of preliminary plastic deformation on the fatigue resistance of the material |
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Application publication date: 20120411 Assignee: Jiangsu New Hengji Special Equipment Co., Ltd. Assignor: Northwestern Polytechnical University Contract record no.: 2015320000218 Denomination of invention: Test sample and method for testing performance parameters of pipe under complex stress state Granted publication date: 20140402 License type: Exclusive License Record date: 20150415 |
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Effective date of registration: 20200611 Address after: The famous 211200 Nanjing Road, Jiangsu District of Lishui Province Shi Jiu Zhen No. 1 Patentee after: JIANGSU NEW HENGJI SPECIAL EQUIPMENT Co.,Ltd. Address before: 710072 Xi'an friendship West Road, Shaanxi, No. 127 Patentee before: Northwestern Polytechnical University |