CN103364261A - Method for determining constitutive model parameters of material at ultrahigh strain rate - Google Patents
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Abstract
The invention discloses a method for determining constitutive model parameters of a material at an ultrahigh strain rate, and belongs to the technical field of material characterization, test and numerical analysis. The method comprises the following steps of: acquiring stress strain curves of the material at a low strain rate and a high strain rate through a tension test and a Hopkinson pressure bar test, and reversely optimizing the constitutive model parameters by taking the stress strain curves at different strain rates as a target so as to obtain the optimized constitutive model parameters; performing laser shock peening on the surface of the material, performing surface profile and residual stress test on the material, performing laser shock peening numerical simulation under the boundary condition of actual laser shock parameters, performing spatial statistics on a numerical simulation residual stress value according to a spatial range determined by an X-ray diffraction stress, and reversely optimizing the constitutive model parameters again by taking the deformation quantity and a residual stress test value of an actual surface strengthening region as a target to so as obtain the final constitutive model parameters. The method is high in universality and applicable to a general metal material.
Description
Technical field
The invention belongs to material sign, test and numerical analysis techniques field, be specifically related to a kind of method of measuring Parameters of constitutive model under the material Under High Strain speed.
Background technology
Material tensile test refers to bearing under the axial tension load, measures the test of material behavior, therefrom obtains than the stress-strain diagram under the low strain rate condition.Hopkinson pressure bar test is a kind of, method that mode that utilize high-speed impact obtain material under high strain rate dynamic mechanical response curve theoretical based on the one-dimensional stress ripple.Surface profiler is to measure by the slippage of the contact pilotage of instrument and material surface, thereby obtains the material surface pattern.The X ray stress determination refers to homogeneous X-ray bundle that X-ray diffractometer launches certain wavelength to material surface, and the Bragg diffraction law during according to the material diffraction is measured the unrelieved stress in material or component surface certain limit and the degree of depth.
Laser impact intensified is a kind of employing short pulse (ns level), high-peak power density (GW/cm
2Level) laser irradiation metal surface; make the absorption protective seam absorbing laser energy of metal surface coating and the fiery gas evaporation occurs; produce the plasma shock wave of high pressure, utilize the mechanics effect of shock wave to make material that Under High Strain speed (10 occur under shock wave
6s
-1) dynamic response, make the generation refinement of skin-material microstructure and form high numerical value residual compressive stress, thus the antifatigue of Effective Raise material, the anticorrosive and performance such as resistance to wear.High numerical value residual compressive stress under the normal temperature behind the laser-impact plays decisive role to the raising of material property, therefore the residual stress distribution after impacting by the numerical prediction material laser, can optimize laser impact intensified process program, more directly effectively improve the performance of material.
The accuracy of Parameters of constitutive model is the key of exosyndrome material mechanics response characteristic under differently strained rate conditions.Because the characteristics of Under High Strain speed cause existing means of testing can't directly obtain under the Under High Strain speed bill of materials to stress-strain relation in the laser impact intensified process, be difficult to obtain the Parameters of constitutive model of material under Under High Strain speed, and then can't accurately characterize the stress-strain relation of material under the Under High Strain speed, cause the error of unrelieved stress prediction under the existing rate Related Constitutive Model parameter commonly used, therefore unrelieved stress field distribution after can't Accurate Prediction laser impact intensified needs a kind of mensuration to be suitable for the method for the Parameters of constitutive model under the Under High Strain speed.
Summary of the invention
The object of the present invention is to provide a kind of method of measuring Parameters of constitutive model under the material Under High Strain speed, the method can be by Measurement of Material Mechanical Performance under the differently strained speed, obtain the mechanical property result of material under differently strained rate conditions, obtain the Parameters of constitutive model of material under Under High Strain speed by oppositely optimizing again.
The present invention is achieved through the following technical solutions:
A kind of method of measuring Parameters of constitutive model under the material Under High Strain speed may further comprise the steps:
1) according to basic mechanical performance parameter and the existing Parameters of constitutive model of detected materials, gives initial value A to detected materials
0, detected materials is carried out tension test, obtain the stress-strain diagram of material under low strain rate; Detected materials is carried out Hopkinson pressure bar test, obtain the stress-strain diagram of material under high strain rate;
2) detected materials is carried out the stress-strain diagram that tension test obtains and be made as optimization aim 1, detected materials is carried out the stress-strain diagram that Hopkinson pressure bar test obtains be made as optimization aim 2, and according to optimization aim 1 and optimization aim 2, oppositely optimization meets the Parameters of constitutive model A of stress-strain diagram under low, the high strain rate
1
3) with A
1Initial parameter as laser impact intensified numerical simulation, and with the boundary condition of laser impact intensified test parameters as numerical evaluation, carry out corresponding laser impact intensified numerical simulation, calculate unrelieved stress spatial simulation result and surface deformation analog result, and according to the spatial dimension of X-ray diffraction stress determination, the residual-stress value of logarithm value simulation is carried out spatial statistics;
4) detected materials is carried out X ray stress determination test, obtain the residual-stress value of material after laser impact intensified as optimization aim 3, detected materials is carried out the surface topography testing experiment, obtain the surface deformation amount of material after laser impact intensified as optimization aim 4, and with optimization aim 3 and optimization aim 4 as the optimization aim under the Under High Strain speed, unrelieved stress spatial simulation result and surface deformation analog result that the described laser impact intensified numerical simulation calculation of step 3) obtains are oppositely optimized the outcome parameter A of last optimization constitutive model
2, namely obtain the Parameters of constitutive model of material under Under High Strain speed.
Step 2), 4) described reverse optimization is by contrasting numerical result and actual measured results under the existing Parameters of constitutive model, recycling is carried out repeatedly interpolation, iteration based on the reverse optimization tool of the MATLAB of least square approximation to Parameters of constitutive model, until reach the stop condition of least-squares algorithm, thereby the material constitutive model parameter of the realistic mechanical property of optimization.
Compared with prior art, the present invention has following useful technique effect:
The present invention at first obtains the stress-strain diagram of material under low, high strain rate by tension test and Hopkinson pressure bar test, stress-strain diagram under the differently strained speed of test gained carries out the reverse optimization of Parameters of constitutive model as target, Parameters of constitutive model after obtaining to optimize first; Then material surface is carried out laser impact intensified processing, and material carried out the test of surface profile and unrelieved stress, under the boundary condition of practical laser impact parameter, carry out laser impact intensified numerical simulation, spatial dimension according to the X-ray diffraction stress determination, the residual-stress value of logarithm value simulation is carried out spatial statistics, deformation quantity and unrelieved stress test value take the real surface strengthening region carries out the reverse optimization of Parameters of constitutive model again as target at last, obtains final Parameters of constitutive model.The inventive method has the following advantages:
1, carries out the method for spatial statistics by the logarithm value analog result, laser impact intensified unrelieved stress numerical prediction value and X-ray diffraction measured value are organically connected;
2, simultaneously with the deformation quantity behind the material laser shock peening and residual stress distribution as the Parameters of constitutive model optimization aim, material dynamic performance has higher precision under the Under High Strain speed characterizing to make location parameter;
3, can remedy inaccurate, the correct defective of the dynamic mechanical response process of exosyndrome material under Under High Strain speed of existing rate Related Constitutive Model parameter;
4, this method of measuring Parameters of constitutive model under the Under High Strain has preferably versatility, goes for the common metal material.
Description of drawings
Fig. 1 is laser impact intensified testing program figure, presses among the figure 9 light spot laser shocks orders of 1～9, and the facula position after obtaining impacting distributes;
Fig. 2 is the surface deformation testing scheme after laser impact intensified;
Fig. 3 is the unrelieved stress testing scheme after laser impact intensified;
Fig. 4 is the process flow diagram that Parameters of constitutive model is measured under the Under High Strain speed of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with concrete drawings and Examples, and the explanation of the invention is not limited.
Referring to Fig. 3, the present invention measures the method for Parameters of constitutive model under the material Under High Strain speed, may further comprise the steps:
1) according to basic mechanical performance parameter and the existing Parameters of constitutive model of detected materials, gives initial value A to detected materials
0, detected materials is carried out tension test, obtain material at quasistatic low strain rate (10
-4～10
-1s
-1) under stress-strain diagram; Detected materials is carried out Hopkinson pressure bar test, obtain material at high strain rate (10
2～10
4s
-1) under stress-strain diagram;
2) detected materials is carried out the stress-strain diagram that tension test obtains and be made as optimization aim 1, detected materials is carried out the stress-strain diagram that Hopkinson pressure bar test obtains be made as optimization aim 2, and according to optimization aim 1 and optimization aim 2, oppositely optimization meets the Parameters of constitutive model A of stress-strain diagram under low, the high strain rate
1
3) with A
1Initial parameter as laser impact intensified numerical simulation, and with the boundary condition of laser impact intensified test parameters as numerical evaluation, carry out corresponding laser impact intensified numerical simulation, calculate unrelieved stress spatial simulation result and surface deformation analog result, and according to the spatial dimension of X-ray diffraction stress determination, the residual-stress value of logarithm value simulation is carried out spatial statistics;
4) detected materials is carried out X-ray stress determination test, obtain the residual-stress value of material after laser impact intensified as optimization aim 3, detected materials is carried out the surface topography testing experiment, obtain the surface deformation amount of material after laser impact intensified as optimization aim 4, and with optimization aim 3 and optimization aim 4 as Under High Strain speed (〉 10
5s
-1) under optimization aim, to the described laser impact intensified numerical simulation calculation of step 3) obtain unrelieved stress spatial simulation result and the reverse optimization of carrying out Parameters of constitutive model of surface deformation analog result, the outcome parameter A of last optimization constitutive model
2, namely obtain the Parameters of constitutive model of material under Under High Strain speed.
Step 2) and 4) described reverse optimization is by contrasting numerical result and actual measured results under the existing Parameters of constitutive model, recycling is carried out repeatedly interpolation, iteration based on the reverse optimization tool of the MATLAB of least square approximation to Parameters of constitutive model, until reach the stop condition of least-squares algorithm, thereby the material constitutive model parameter of the realistic mechanical property of optimization.
The present invention specifically adopts the TC4 titanium alloy material to process and test, and material surface carries out laser impact intensified processing as shown in Figure 1, and surface profile test and unrelieved stress are tested as shown in Figure 2, and the concrete steps of location parameter are:
1) TC4 materials processing is become the standard tensile sample, respectively 10
-3s
-1, 10
-2s
-1, 10
-1s
-1Carry out tension test under the strain rate, utilize the displacement time-histories of digital speckle systematic survey observation station, process obtaining the stress-strain diagram of material under differently strained speed;
2) TC4 materials processing is become the sample of 5 * Φ 5, utilize the Hopkinson pressure bar test test material 10
3s
-1Stress-strain diagram under the strain rate;
3) according to the laser impact intensified scheme of Fig. 1 (the laser-impact parameter: energy is 6J, wavelength 1064nm, pulsewidth 20ns, power density is 4.24GW/cm
2, hot spot is the round hot spot of Φ 4mm, the hot spot overlapping rate is 50%) the TC4 titanium alloy surface is strengthened; In order to make required test point as far as possible few, be rotational symmetry or symmetric form with laser-impact hot spot layout design generally;
4) according to surface deformation and the unrelieved stress testing scheme of Fig. 2 and Fig. 3, effects on surface carries out the profile test, therefrom draws a little 1～5 deformation quantity; Test point 1～12 in effects on surface and cross section is carried out the X ray stress determination.Wherein, point 1～5 is surface profile and unrelieved stress test point, and point 5～12 is unrelieved stress test point on the degree of depth;
5) with existing Parameters of constitutive model A
0Be reference, by step 1), 2) in to obtain strain rate be 10
-3s
-1, 10
-2s
-1, 10
-1s
-1, 10
3s
-1Under stress-strain diagram be optimization aim, utilize based on the reverse optimization tool of the MATLAB of least square approximation, obtain to be suitable for the model parameter A under low, the high strain rate
1With A
1The Parameters of constitutive model of material during as laser impact intensified numerical simulation, calculate surface deformation amount and residual-stress value under the practical laser shock peening parameter, and according to the X ray measurement range unrelieved stress is carried out spatial statistics, again the strengthening region surface deformation amount that measures in the step 4) and residual-stress value as reverse optimization aim, deformation quantity and the residual-stress value of contrast test test and numerical simulation, utilize based on the reverse optimization tool of the MATLAB of least square approximation, acquisition TC4 titanium alloy is suitable for the Parameters of constitutive model A under the Under High Strain speed
2
In sum, the present invention is by Measurement of Material Mechanical Performance under the differently strained speed, obtain the mechanical property result of material under differently strained rate conditions, obtain the material constitutive model parameter by reverse Optimal Fitting at last, thereby the unrelieved stress field distribution after exactly exosyndrome material dynamic response process, and then Accurate Prediction is laser impact intensified.
The present invention carries out the method for spatial statistics by the logarithm value analog result, laser impact intensified unrelieved stress numerical prediction value and X-ray diffraction measured value are organically connected, the target of simultaneously deformation quantity behind the material laser shock peening and residual stress distribution being optimized as Parameters of constitutive model, make location parameter material dynamic performance under sign Under High Strain speed have higher precision, this method has preferably versatility, goes for the common metal material.
Claims (2)
1. a method of measuring Parameters of constitutive model under the material Under High Strain speed is characterized in that, may further comprise the steps:
1) according to basic mechanical performance parameter and the existing Parameters of constitutive model of detected materials, give initial value A for the detected materials Parameters of constitutive model
0, detected materials is carried out tension test, obtain the stress-strain diagram of material under low strain rate; Detected materials is carried out Hopkinson pressure bar test, obtain the stress-strain diagram of material under high strain rate;
2) detected materials is carried out the stress-strain diagram that tension test obtains and be made as optimization aim 1, detected materials is carried out the stress-strain diagram that Hopkinson pressure bar test obtains be made as optimization aim 2, and according to optimization aim 1 and optimization aim 2, oppositely optimization meets the Parameters of constitutive model A of stress-strain diagram under low, the high strain rate
1
3) with A
1Parameters of constitutive model as laser impact intensified numerical simulation, and with the boundary condition of laser impact intensified test parameters as numerical evaluation, carry out corresponding laser impact intensified numerical simulation, calculate unrelieved stress spatial simulation result and surface deformation analog result, and according to the spatial dimension of X-ray diffraction stress determination, the residual-stress value of logarithm value simulation is carried out spatial statistics;
4) detected materials is carried out X ray stress determination test, obtain the residual-stress value of material after laser impact intensified as optimization aim 3, detected materials is carried out the surface topography testing experiment, obtain the surface deformation amount of material after laser impact intensified as optimization aim 4, and with optimization aim 3 and optimization aim 4 as the optimization aim under the Under High Strain speed, unrelieved stress spatial simulation result and surface deformation analog result that the described laser impact intensified numerical simulation calculation of step 3) obtains are oppositely optimized the outcome parameter A of last optimization constitutive model
2, namely obtain the Parameters of constitutive model of material under Under High Strain speed.
2. a kind of method of measuring Parameters of constitutive model under the material Under High Strain speed according to claim 1, it is characterized in that, step 2), 4) described reverse optimization is by contrasting numerical result and actual measured results under the existing Parameters of constitutive model, recycling is carried out repeatedly interpolation, iteration based on the reverse optimization tool of the MATLAB of least square approximation to Parameters of constitutive model, until reach the stop condition of least-squares algorithm, thereby the material constitutive model parameter of the realistic mechanical property of optimization.
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| CN107290215A (en) * | 2017-06-23 | 2017-10-24 | 中国矿业大学 | A kind of Forecasting Methodology for coated fabric membrane material viscoelasticity constitutive behavior |
| CN107305174A (en) * | 2016-04-20 | 2017-10-31 | 中国特种设备检测研究院 | A kind of material stress strains the numerical representation method method and system of constitutive relation |
| CN107589001A (en) * | 2017-09-08 | 2018-01-16 | 吉林大学 | A kind of material impact experimental method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102135480A (en) * | 2010-12-17 | 2011-07-27 | 北京理工大学 | System and method for performing impact loading on micro test piece and measuring dynamic mechanical property |
| JP2011196884A (en) * | 2010-03-19 | 2011-10-06 | Keihin Corp | Simulation device of creep deformation characteristic |
| CN102313677A (en) * | 2011-08-31 | 2012-01-11 | 湖南大学 | Detection method for identifying dynamic mechanical property parameter of different area materials in weld joint |
| WO2013042600A1 (en) * | 2011-09-19 | 2013-03-28 | 日本電気株式会社 | Stress-strain relation simulation method, stress-strain relation simulation system, and stress-strain relation simulation program which use chaboche model |
-
2013
- 2013-07-09 CN CN201310287333.2A patent/CN103364261B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011196884A (en) * | 2010-03-19 | 2011-10-06 | Keihin Corp | Simulation device of creep deformation characteristic |
| CN102135480A (en) * | 2010-12-17 | 2011-07-27 | 北京理工大学 | System and method for performing impact loading on micro test piece and measuring dynamic mechanical property |
| CN102313677A (en) * | 2011-08-31 | 2012-01-11 | 湖南大学 | Detection method for identifying dynamic mechanical property parameter of different area materials in weld joint |
| WO2013042600A1 (en) * | 2011-09-19 | 2013-03-28 | 日本電気株式会社 | Stress-strain relation simulation method, stress-strain relation simulation system, and stress-strain relation simulation program which use chaboche model |
Non-Patent Citations (1)
| Title |
|---|
| 鲁世红，何宁: "高应变速率下Al-Mg-Sc合金压缩变形的流变方程", 《中国有色金属学报》, vol. 18, no. 5, 31 May 2008 (2008-05-31), pages 897 - 902 * |
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| CN107290215B (en) * | 2017-06-23 | 2019-05-21 | 中国矿业大学 | A kind of prediction technique for coated fabric membrane material viscoelasticity constitutive behavior |
| CN107589001A (en) * | 2017-09-08 | 2018-01-16 | 吉林大学 | A kind of material impact experimental method |
| CN107589001B (en) * | 2017-09-08 | 2020-12-29 | 吉林大学 | Material impact experiment method |
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