CN102175511A - Method and system for estimating material property - Google Patents
Method and system for estimating material property Download PDFInfo
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- CN102175511A CN102175511A CN 201010607995 CN201010607995A CN102175511A CN 102175511 A CN102175511 A CN 102175511A CN 201010607995 CN201010607995 CN 201010607995 CN 201010607995 A CN201010607995 A CN 201010607995A CN 102175511 A CN102175511 A CN 102175511A
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Abstract
The invention relates to a method for estimating material property, and the method comprises the following steps: acquiring the actual transformation displacement of a tested material through a mechanical experiment under a specific working condition; according to a preset property parameter of the tested material, acquiring the simulated transformation displacement of the tested material by utilizing the computer aided engineering to simulate the mechanical experiment under the specific working condition; comparing the simulated transformation displacement with the actual transformation displacement, thereby acquiring the actual property parameter of the tested material; and according to the actual property parameter of the tested material, acquiring the working property of the tested material under various working conditions by utilizing the computer aided engineering to simulate the mechanical experiment under other working conditions. The invention relates to the method for estimating the material property. The system and method for estimating the material property provided by the invention can be used for accurately acquiring the property parameter of the material through experiment and computer aided engineering simulation and performing the simulation test for various working conditions according to the property parameter of the material, thereby avoiding the defect of huge test work load caused by retesting the material property under the condition of the change of the tested working condition.
Description
Technical field
The present invention relates to the material evaluation field, more particularly, relate to a kind of material property appraisal procedure and system by the area of computer aided The Realization of Simulation.
Background technology
Has certain difference between the nominal parameter in the common actual engineering in employed material property parameter and the manual of standards, this is because most engineering materials belongs to compound substance, the difference of its material internal microcosmic component has directly determined the macro-mechanical property of whole material to change, especially material and alloy material etc. after some founding materialses, the thermal treatment, the proportioning of interior microscopic component is subjected to influences such as external process, environmental factor and causes the macro-mechanical property significant difference.Along with the high-precision development trend of machine industry, the modern precision lathe is more and more higher to the accuracy requirement of the performance parameter value of material, very important for micron-sized distortion, because the performance parameter of material has directly determined the mechanical behavior of material, therefore for the structure of whole lathe assembly, especially the accuracy of large-scale component guaranteed performance parameter is most important.
In actual production, we can do testing of materials to every batch of supplied materials, but test all is the performance with actual condition checking material, can accurately not judge the accurate material property of every batch of supplied materials, and the focus that precision machine tool industry master pays close attention to is to form machine part in the distortion that is subjected to part under the tension and compression bending composite condition, destroy, problems such as unstability, operating loading in the face of lengthy and tedious complexity, type of attachment and thousand becomes ten thousand structural forms, the change of any operating mode all may need supplied materials is carried out the requirement that material properties test judges whether to satisfy new operating mode again, and substantive test work meeting brings great burden to manufacturing industry like this.
Summary of the invention
The technical problem to be solved in the present invention is, need carry out material properties test when changing again and cause the huge defective of test job burden at the test operating mode of prior art, provide a kind of and accurately obtain material property parameter with computer-aided engineering emulation by experiment, in the material property appraisal procedure and the system of the simulation test that carries out various operating modes by material property parameter.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of material property appraisal procedure, obtain the practical distortion displacement of test material comprising step: S1, by the Experiments of Machanics under the specific operation; S2, according to the performance parameter of the test material of setting, obtain the emulation deformation displacement of described test material by the Experiments of Machanics under the described specific operation of computer-aided engineering emulation; S3, described practical distortion displacement and described emulation deformation displacement are compared, the deviation of practical distortion displacement and described emulation deformation displacement is less than standard value as described, thinks that then the performance parameter of test material of described setting is the actual performance parameter of described test material; The deviation overgauge value of practical distortion displacement and described emulation deformation displacement as described then changes the performance parameter of the test material of described setting, returns step S2; S4, according to the actual performance parameter of described test material, obtain the serviceability of described test material under each operating mode by the Experiments of Machanics under other operating modes of computer-aided engineering emulation.
In material property appraisal procedure of the present invention, the practical distortion displacement when practical distortion displacement when described practical distortion displacement comprises described test material pressurized and described test material resilience; Deformation displacement when the deformation displacement when described emulation deformation displacement comprises the test material pressurized of emulation and the test material resilience of described emulation; Described performance parameter is elastic modulus, yield stress and Poisson ratio.
In material property appraisal procedure of the present invention, described step S2 comprises step: S21, set up limited element calculation model according to the Experiments of Machanics under the described specific operation; The performance parameter of S22, setting test material; S23, the performance parameter that loads described limited element calculation model and described test material in computer-aided engineering are carried out the emulation deformation displacement that emulation obtains described test material.
In material property appraisal procedure of the present invention, described step S22 is the nonlinear elasticity plastic material for test material as described, then sets the performance parameter of described test material according to engineering experience; Test material is a resilient material as described, then sets the performance parameter of described test material according to linear elasticity contact theory and small deformation hypothesis.
In material property appraisal procedure of the present invention, described step S23 comprises: S231, the performance parameter that loads described limited element calculation model and described test material in computer-aided engineering are carried out emulation; S232, utilize majorized function to obtain the emulation deformation displacement of described test material according to simulation result.
The invention still further relates to a kind of material property evaluating system, comprising: experiment test module: be used for obtaining the practical distortion displacement of test material by the Experiments of Machanics under the specific operation; Emulation testing module: be used for performance parameter, obtain the emulation deformation displacement of described test material by the Experiments of Machanics under the described specific operation of computer-aided engineering emulation according to the test material of setting; Parameter acquisition module: be used for described practical distortion displacement and described emulation deformation displacement are compared, the deviation of practical distortion displacement and described emulation deformation displacement is less than standard value as described, thinks that then the performance parameter of test material of described setting is the actual performance parameter of described test material; The deviation overgauge value of practical distortion displacement and described emulation deformation displacement as described then changes the performance parameter of the test material of described setting, returns described emulation testing module and handles; And application module: be used for actual performance parameter, obtain the serviceability of described test material under each operating mode by the Experiments of Machanics under other operating modes of computer-aided engineering emulation according to described test material.
In material property evaluating system of the present invention, the practical distortion displacement when practical distortion displacement when described practical distortion displacement comprises described test material pressurized and described test material resilience; Deformation displacement when the deformation displacement when described emulation deformation displacement comprises the test material pressurized of emulation and the test material resilience of described emulation; Described performance parameter is elastic modulus, yield stress and Poisson ratio.
In material property evaluating system of the present invention, described emulation testing module comprises: the modelling unit: be used for setting up limited element calculation model according to the Experiments of Machanics under the described specific operation; Setup unit: the performance parameter that is used to set test material; And simulation unit: be used for carrying out the emulation deformation displacement that emulation obtains described test material in the performance parameter of computer-aided engineering described limited element calculation model of loading and described test material.
In material property evaluating system of the present invention, test material is the nonlinear elasticity plastic material as described, then sets the performance parameter of described test material according to engineering experience; Test material is a resilient material as described, then sets the performance parameter of described test material according to linear elasticity contact theory and small deformation hypothesis.
In material property evaluating system of the present invention, described simulation unit comprises: the emulation subelement: be used for carrying out emulation in the performance parameter of computer-aided engineering described limited element calculation model of loading and described test material; And optimization subelement: be used for utilizing majorized function to obtain the emulation deformation displacement of described test material according to simulation result.
Implement material property appraisal procedure of the present invention and system, has following beneficial effect: accurately obtain material property parameter with computer-aided engineering emulation by experiment, carry out the simulation test of various operating modes again by material property parameter, need carry out material properties test when having avoided the test operating mode to change again and cause the huge defective of test job burden.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the process flow diagram of first preferred embodiment of material property appraisal procedure of the present invention;
Fig. 2 is the process flow diagram of step S2 of second preferred embodiment of material property appraisal procedure of the present invention;
Fig. 3 is the process flow diagram of step S2 of the 3rd preferred embodiment of material property appraisal procedure of the present invention;
Fig. 4 is the structural representation of first preferred embodiment of material property evaluating system of the present invention;
Fig. 5 is the structural representation of second preferred embodiment of material property evaluating system of the present invention;
Fig. 6 is the structural representation of the 3rd preferred embodiment of material property evaluating system of the present invention;
Fig. 7 is the proving installation synoptic diagram of the Experiments of Machanics under the specific operation of the present invention;
Fig. 8 is the simulator synoptic diagram of the Experiments of Machanics under the specific operation of the present invention;
Fig. 9 is the comparison diagram of the test result of the test result of Fig. 7 device and Fig. 8 simulator.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
In the process flow diagram of first preferred embodiment of material property appraisal procedure of the present invention shown in Figure 1, described material property appraisal procedure starts from step 100, subsequently, to next step 101, obtain the practical distortion displacement of test material by the Experiments of Machanics under the specific operation; Subsequently, to next step 102,, obtain the emulation deformation displacement of described test material by the Experiments of Machanics under the described specific operation of computer-aided engineering emulation according to the performance parameter of the test material of setting; Subsequently, to next step 103, described practical distortion displacement and described emulation deformation displacement are compared, the deviation of practical distortion displacement and described emulation deformation displacement is less than standard value as described, thinks that then the performance parameter of test material of described setting is the actual performance parameter of described test material; The deviation overgauge value of practical distortion displacement and described emulation deformation displacement as described then changes the performance parameter of the test material of described setting, returns step 102; Subsequently, to next step 104,, obtain the serviceability of described test material under each operating mode by the Experiments of Machanics under other operating modes of computer-aided engineering emulation according to the actual performance parameter of described test material; Last method ends at step 105.This material property appraisal procedure is accurately obtained material property parameter with computer-aided engineering emulation by experiment, carry out the simulation test of various operating modes again by material property parameter, the superiority of the method is: the actual performance parameter that not only can obtain material, and can intuitively obtain the stress deformation situation of structure, the rationality that the simultaneous verification material is selected need be carried out material properties test again and be caused the huge defective of test job burden when having avoided the test operating mode to change.
As the preferred embodiment of material property appraisal procedure of the present invention, the practical distortion displacement when practical distortion displacement when described practical distortion displacement comprises described test material pressurized and described test material resilience; Deformation displacement when the deformation displacement when described emulation deformation displacement comprises based on the test material pressurized of simulation result and the test material resilience of described emulation; Described performance parameter is elastic modulus, yield stress and Poisson ratio.Deformation displacement by easy observation carries out the mechanical test under the specific operation, and by with the real performance parameter that relatively obtains material of emulation testing data, make and to carry out emulation testing under other various operating modes according to these real performance parameters, draw the serviceability of test material under various operating modes.
Process flow diagram at the step S2 of second preferred embodiment of material property appraisal procedure of the present invention shown in Figure 2; The step S2 of described material property appraisal procedure starts from step 200, subsequently, to next step 201, sets up limited element calculation model according to the Experiments of Machanics under the described specific operation; Subsequently, to next step 202, set the performance parameter of test material; Subsequently, to next step 203, the performance parameter that loads described limited element calculation model and described test material in computer-aided engineering is carried out the emulation deformation displacement that emulation obtains described test material; Last method ends at step 204.In the CAD modeling environment, set up the entire assembly model corresponding with the Experiments of Machanics under the specific operation; afterwards model is imported the computer-aided engineering pre-processing module; assembly is consistent in the finite element model of guaranteeing in the emulated computing environment to be set up and the actual test, gives material initial performance parameter for test material simultaneously.Finite element simulation calculates whole process and mainly comprises pre-treatment, calculates and to find the solution and restrain debugging and aftertreatment three parts.Especially note guaranteeing that realistic model has identical mechanical environment with actual test sample.After the convergence debugging, enter post-processing module and obtain and change curve like the actual test class.
As the preferred embodiment of material property appraisal procedure of the present invention, described step S22 is the nonlinear elasticity plastic material for test material as described, then sets the performance parameter of described test material according to engineering experience; Test material is a resilient material as described, then sets the performance parameter of described test material according to linear elasticity contact theory and small deformation hypothesis.The performance parameter that the test material of guaranteeing initial setting up is set like this is more accurate, reduces the adjustment to the starting condition of emulation testing.
Process flow diagram at the step S2 of the 3rd preferred embodiment of material property appraisal procedure of the present invention shown in Figure 3; The step S2 that states the material property appraisal procedure starts from step 300, subsequently, to next step 301, sets up limited element calculation model according to the Experiments of Machanics under the described specific operation; Subsequently, to next step 302, set the performance parameter of test material; Subsequently, to next step 303, carry out emulation in the performance parameter that in computer-aided engineering, loads described limited element calculation model and described test material; Subsequently, to next step 304, utilize majorized function to obtain the emulation deformation displacement of described test material according to simulation result; Last method ends at step 305.Utilize majorized function to guarantee the rational performance parameter of material,, therefore open asymmetric solver and strengthen convergence owing to there is plastic material to participate in calculating; For guaranteeing result's accuracy, considered the influence of gravity factor in the calculating in addition.
The invention still further relates to a kind of material property evaluating system, in the structural representation of first preferred embodiment of material property evaluating system of the present invention shown in Figure 4, described material property evaluating system comprises experiment test module 1, emulation testing module 2, parameter acquisition module 3 and application module 4, and experiment test module 1 is used for obtaining by the Experiments of Machanics under the specific operation practical distortion displacement of test material; Emulation testing module 2 is used for the performance parameter according to the test material of setting, and obtains the emulation deformation displacement of described test material by the Experiments of Machanics under the described specific operation of computer-aided engineering emulation; Parameter acquisition module 3 is used for described practical distortion displacement and described emulation deformation displacement are compared, the deviation of practical distortion displacement and described emulation deformation displacement is less than standard value as described, thinks that then the performance parameter of test material of described setting is the actual performance parameter of described test material; The deviation overgauge value of practical distortion displacement and described emulation deformation displacement as described then changes the performance parameter of the test material of described setting, returns described emulation testing module 2 and handles; Application module 4 is used for the actual performance parameter according to described test material, obtains the serviceability of described test material under each operating mode by the Experiments of Machanics under other operating modes of computer-aided engineering emulation.The parameter acquisition module 3 of this material property evaluating system test module 1 and emulation testing module 2 is by experiment accurately obtained material property parameter, application module 4 carries out the simulation test of various operating modes again by material property parameter, the superiority of this system is: the actual performance parameter that not only can obtain material, and can intuitively obtain the stress deformation situation of structure, the rationality that the simultaneous verification material is selected need be carried out material properties test again and be caused the huge defective of test job burden when having avoided the test operating mode to change.
As the preferred embodiment of material property evaluating system of the present invention, the practical distortion displacement when practical distortion displacement when described practical distortion displacement comprises described test material pressurized and described test material resilience; Deformation displacement when the deformation displacement when described emulation deformation displacement comprises the test material pressurized of emulation and the test material resilience of described emulation; Described performance parameter is elastic modulus, yield stress and Poisson ratio.Deformation displacement by easy observation carries out the mechanical test under the specific operation, and by with the real performance parameter that relatively obtains material of emulation testing data, make and to carry out emulation testing under other various operating modes according to these real performance parameters, draw the serviceability of test material under various operating modes.
In the structural representation of second preferred embodiment of material property evaluating system of the present invention shown in Figure 5, emulation testing module 2 comprises modelling unit 21, setup unit 22 and simulation unit 23, and modelling unit 21 is used for setting up limited element calculation model according to the Experiments of Machanics under the described specific operation; Setup unit 22 is used to set the performance parameter of test material; Simulation unit 23 is used for carrying out the emulation deformation displacement that emulation obtains described test material in the performance parameter of computer-aided engineering described limited element calculation model of loading and described test material.The entire assembly model corresponding with the Experiments of Machanics under the specific operation set up in modelling unit 21 in the CAD modeling environment; simulation unit 23 imports the computer-aided engineering pre-processing module with model afterwards; assembly is consistent in the finite element model of guaranteeing in the emulated computing environment to be set up and the actual test, and 22 pairs of test materials of setup unit are given material initial performance parameter simultaneously.Finite element simulation calculates whole process and mainly comprises pre-treatment, calculates and to find the solution and restrain debugging and aftertreatment three parts.Especially note guaranteeing that realistic model has identical mechanical environment with actual test sample.After the convergence debugging, enter post-processing module and obtain and change curve like the actual test class.
As the preferred embodiment of material property evaluating system of the present invention, test material is the nonlinear elasticity plastic material as described, then sets the performance parameter of described test material according to engineering experience; Test material is a resilient material as described, then sets the performance parameter of described test material according to linear elasticity contact theory and small deformation hypothesis.The performance parameter that the test material of guaranteeing initial setting up is set like this is more accurate, reduces the adjustment to the starting condition of emulation testing.
In the structural representation of the 3rd preferred embodiment of material property evaluating system of the present invention shown in Figure 6, simulation unit 23 comprises emulation subelement 231 and optimizes subelement 232 that emulation subelement 231 is used for carrying out emulation in the performance parameter of computer-aided engineering described limited element calculation model of loading and described test material; Optimizing subelement 232 is used for utilizing majorized function to obtain the emulation deformation displacement of described test material according to simulation result.Optimize subelement 232 and utilize majorized function to guarantee that emulation subelement 231 obtains the rational performance parameter of material,, therefore open asymmetric solver and strengthen convergence owing to there is plastic material to participate in calculating; For guaranteeing result's accuracy, considered the influence of gravity factor in the calculating in addition.
The present invention is a kind of method and system that calculates to determine material macro-mechanical property parameter by computer-aided engineering, utilize the innate advantage of simulation calculation to remedy the defective of Experiment on Engineering Testing, when guaranteeing reliability of material, reduced experimental cost, shortened the R﹠D cycle.
Technical scheme of the present invention is to measure the mechanical behavior of homogeneous body with physical method, special frock realizable force sensor and displacement transducer data synchronization by the simulation specific operation are gathered, thereby obtain the practical distortion displacement of material, further this material experiment is finally obtained the actual mechanical property parameters of material in conjunction with the finite element simulation calculation, specific implementation process is as follows:
1, design Experiments of Machanics frock is finished loading experiment.
The aim of this experiment frock design is to finish the compressive strain experiment of test specimen by the slow loading of feed mechanism, this frock has been carried the synchro measure of power and displacement data, press down displacement data and contact counter-force data in test process, writing down simultaneously, therefore carried force transducer and displacement transducer and terminal feedback system.
2, standard test exemplar processing.
The supporting body of compressive strain experiment is promptly tested exemplar, be generally and be convenient to test experiments and simulation calculation is made into master body, its shape can be cylindrical rod or rectangular stripe shape, should tentatively judge the magnitude of its opposing moment of flexure simultaneously according to the mechanical property of measure and monitor the growth of standing timber material, for avoiding loading the cross section moment of inertia that difficulty is answered the primary Calculation material, determine the rational macro-size of exemplar.
3, the exemplar displacement loads test and result's output.
Utilize self-control manual loading device to carry out the quasistatic process of slow loading simulation test specimen pressurized; Utilize power acquisition system and force transducer to gather force signal; Utilize displacement acquisition system and displacement transducer to gather the exemplar distortion.The discrete points data of each self terminal output is handled, obtained contacting counter-force with displacement changing curve.
4, finite element modeling and initial mechanical parametric assumption.
In the CAD modeling environment, set up the assembly 3D model corresponding with test experiments; afterwards the 3D model is imported the computer-aided engineering pre-processing module; assembly is consistent in the finite element model of guaranteeing in the emulated computing environment to be set up and the actual test, needs give material initial performance parameter according to engineering experience for test material simultaneously.
5, finite element simulation calculates and aftertreatment as a result.
Finite element simulation calculates whole process and mainly comprises pre-treatment, calculates and to find the solution and restrain debugging and aftertreatment three parts.Especially notice that applying of border condition such as the power of pre-treatment and displacement load should guarantee that realistic model has identical mechanical environment with actual test sample.After the convergence debugging, enter post-processing module and obtain contacting counter-force with displacement changing curve with like the actual test class.
6, the actual mechanical property of material is determined in mechanics parameter optimization.
Finite element simulation result and actual test data are compared, choose corresponding optimization aim function, when satisfying given objective function, both change curves can obtain the actual performance parameter value of material, if do not satisfy, the change original hypothesis, the whole above-mentioned solution procedure that circulates satisfies optimal conditions until given material property parameter, stops calculating.
Specific embodiment below by material property appraisal procedure of the present invention illustrates above-mentioned embodiment of the present invention:
The objective of the invention is to calculate the mechanical property parameters that the mode that combines quantizes test material by compressive strain experiment and computer-aided engineering.For choosing of material as long as online elastic range and all not limiting in the metal initial plastic yielding stage, can choose any homemade master body tests, implementation process is not limited to arbitrary process of experiment and emulation, but from experiment and the process of the mutual verification of emulation, obtain the true apparent mechanical properties parameter of material, significant for strength design of components and fail-safe analysis.
1, tool structure design and master body are made
The experiment frock is mainly finished the synchronous acquisition of mechanical test experiment contact force data and displacement data, structure division as shown in Figure 7, whole test system comprises working pressure axle 71, hand feeding mechanism 72, manual positioning mechanism 74, test portion 75, piezoelectric quartz force sensor 73, displacement transducer 77 and supporting mechanism 76, wherein piezoelectric quartz sensor 73 is respectively applied for to measure to contact counter-force and press down displacement with displacement transducer 77 and also can passes through system terminal record test data separately, the special test portion 75 of this test is a ZL104 cylinder bar, sectional dimension φ 20mm, length 200mm.
2, master body compressive strain test experiments and data preparation.
In the test process, test portion 75 is placed on the supporting mechanism 76, and guarantee that test portion 75 center lines are vertical with working pressure axle 71 center lines, make tested test portion 75 tops and bottom just be contacted with piezoelectric quartz force sensor 73 and displacement transducer 77 respectively, the displacement that presses down by manual positioning mechanism 74 and hand feeding mechanism 72 control piezoelectric quartz force sensors 73, test portion 75 produces flexural deformation behind the following pressure contact force that is continued to increase, afterwards deformation displacement is passed to the displacement transducer 77 of bottom contact, so in pressing down deformation process, can synchro measure displacement and time and the time dependent data of power by piezoelectric quartz force sensor 73 and displacement transducer 77.According to above-mentioned experimental data, further data processing cancellation time variable therefore can be in the hope of the data and curves of contact counter-force with the discrete sampling point of change in displacement.
3, finite element modeling and original material parametric assumption.
Carry out for the mode that the emulation of material experiment adopts displacement to load, owing to do not consider the influence of materials rate correlativity, and loading procedure is very slow, has therefore ignored time factor, belongs to the category of static analysis.The model entity structure is set up in the CAD environment, remove to import the computer-aided engineering pre-processing module behind the redundancy section, limited element calculation model as shown in Figure 8, total comprises test material 81, pressure head 82 and bottom support 83 3 parts.Test exemplar material is a cast aluminium 104, because exemplar real material parameter may there were significant differences with nominal value, therefore need its mechanical property parameters is carried out original hypothesis, this simulation process hypothesis elasticity modulus of materials E is 6.9E+5Mpa, Poisson ratio v is 0.3, yield stress 230Mpa.
4, finite element method (fem) analysis and aftertreatment as a result
Calculating test material 81 with identical load mode in computer-aided engineering emulation is being subjected to pressure head 82 differences and is pressing down stress deformation situation under the displacement, the Stress Field Distribution in plastic yield zone particularly, wherein experimental data can be used as the input of simulation calculation on the one hand, can contrast with the simulation calculation result on the other hand, utilize majorized function to determine the rational mechanics parameter of material.Therefore this simulation analysis is opened asymmetric solver and is strengthened convergence owing to there is plastic material to participate in calculating.For guaranteeing result's accuracy, considered the influence of gravity factor in the calculating in addition.
Simulation calculation is to pressure head 82 simulation with test material 81 interaction one-period processes, comprises Stress Field Distribution situation and unrelieved stress size in the stress deformation situation of test material 81 in the process of pressing down and the springback process.Displacement during this simulation calculation process is tested with reality loads and is consistent, calculate when pressing down displacement and stop for 1mm, calculating is in the promptly different constantly stress deformation situations that press down test material 81 under the displacement of difference, in the springback process, because process is not slowly considered the influence of time factor, still is considered as static process, along with displacement of pressing head is oppositely withdrawn, the test portion stress deformation constantly reduces, same calculating in the promptly different constantly stress deformation situations that press down test material 81 under the displacement of difference.
5, simulation calculation data and test data contrast.
We have obtained the raw data of material property by experiment respectively with two kinds of means of emulation from the above mentioned, obtaining data by piezoelectric quartz force sensor 73 and displacement transducer 77 on the one hand obtains based on the power of testing indirectly with displacement changing curve, by being simplified, the experiment tool structure sets up corresponding finite element model on the other hand, carry out simulation calculation, aftertreatment is as a result obtained power based on numerical simulation with displacement changing curve, now two curve datas are compared as shown in Figure 9, emulation and experimental result curve are made up of the data of discrete point.By calculating the degree of agreement of two curves, the result shows that experimental result and simulation result have finally obtained coincideing, thereby the mechanical property parameters that can prove our original hypothesis has been represented the true mechanical characteristic of this lot sample spare material.
6, material mechanical parameters optimization is analyzed
If the result and the practical test result significant difference of simulation calculation in the above-mentioned steps 5, the not real actual performance parameter of reacting this batch supplied materials of mechanical property parameters that then shows our original hypothesis, therefore need to adjust original hypothesis according to engineering experience, again carry out FEM (finite element) calculation, compare with experimental result once more by aftertreatment as a result, constantly this process of circulation reaches identical until simulation result and experimental result.In the process of this parameter optimization, can judge the degree of agreement of two result curve according to following objective function (1), if deviation thinks then that greater than given standard value two curves degree are bad, needing to adjust parameter recomputates, if deviation is smaller or equal to standard value, represent that then two curves are good, can determine final mechanical property parameters.
Wherein i is for choosing the discrete data number,
Be the experiment test contact force,
Be the simulation result contact force, the objective function here choose and choosing of sampled point can be decided according to actual conditions, generally can choose the other types objective function voluntarily for common yield behavior typical curve, the sampled point of obviously choosing is many more, and the curves degree is good more.
For resilient material, can not determine the initial performance parameter of material in addition,, then can determine the material initial parameter according to linear elasticity contact theory and small deformation hypothesis if the frock pressure head is partly become steel ball according to engineering experience, shown in the following formula (2):
Wherein, F is a pressure, and δ is the pressure head depth of cup, and R is the steel ball radius, for concerning that we can obtain the apparent elastic modulus of material between isotropic material body modulus of shearing and the elastic modulus, shown in the following formula (3):
E＝2G(1+υ) (3)
Wherein, υ is a Poisson ratio, for incompressible material υ=0.5.
7, the authentic material mechanical property parameters obtains.
As mentioned above, the present invention utilizes emulation mode that the identical experiment physical process has been carried out Static Calculation, if making simulation calculation result and experimental result reach, the original material parameter of selecting in the emulation coincide, it is the mechanical property that material property has truly reflected this batch supplied materials, then original hypothesis meets the demands, promptly determined the genuine property of this material, calculating for follow-up other operating loading is that stiffness of structural member, intensity, fail-safe analysis provide numerical basis.Otherwise misfit if test and putting the result, then need utilize the degree of agreement of objective function judged result according to engineering experience or correlation theory change original hypothesis, and this process of repetitive cycling, till obtaining suitable material property parameter.Original hypothesis to the AL104 material in this simulation calculation example is that elastic modulus E is 6.9E+5Mpa, Poisson ratio v is 0.3, yield stress 230Mpa, reached well identical with the material experiment result, therefore can determine the material mechanical performance of this batch supplied materials, for subsequent members design provides the significant in value foundation.
The above only is embodiments of the invention; be not so limit claim of the present invention; every equivalent structure transformation that utilizes instructions of the present invention and accompanying drawing content to be done, or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (10)
1. a material property appraisal procedure is characterized in that, comprises step:
S1, obtain the practical distortion displacement of test material by the Experiments of Machanics under the specific operation;
S2, according to the performance parameter of the test material of setting, obtain the emulation deformation displacement of described test material by the Experiments of Machanics under the described specific operation of computer-aided engineering emulation;
S3, described practical distortion displacement and described emulation deformation displacement are compared, the deviation of practical distortion displacement and described emulation deformation displacement is less than standard value as described, thinks that then the performance parameter of test material of described setting is the actual performance parameter of described test material; The deviation overgauge value of practical distortion displacement and described emulation deformation displacement as described then changes the performance parameter of the test material of described setting, returns step S2;
S4, according to the actual performance parameter of described test material, obtain the serviceability of described test material under each operating mode by the Experiments of Machanics under other operating modes of computer-aided engineering emulation.
2. material property appraisal procedure according to claim 1 is characterized in that, the practical distortion displacement when practical distortion displacement when described practical distortion displacement comprises described test material pressurized and described test material resilience; Deformation displacement when the deformation displacement when described emulation deformation displacement comprises the test material pressurized of emulation and the test material resilience of described emulation; Described performance parameter is elastic modulus, yield stress and Poisson ratio.
3. material property appraisal procedure according to claim 1 is characterized in that, described step S2 comprises step:
S21, set up limited element calculation model according to the Experiments of Machanics under the described specific operation;
The performance parameter of S22, setting test material;
S23, the performance parameter that loads described limited element calculation model and described test material in computer-aided engineering are carried out the emulation deformation displacement that emulation obtains described test material.
4. material property appraisal procedure according to claim 3 is characterized in that, described step S22 is the nonlinear elasticity plastic material for test material as described, then sets the performance parameter of described test material according to engineering experience; Test material is a resilient material as described, then sets the performance parameter of described test material according to linear elasticity contact theory and small deformation hypothesis.
5. material property appraisal procedure according to claim 3 is characterized in that, described step S23 comprises:
S231, the performance parameter that loads described limited element calculation model and described test material in computer-aided engineering are carried out emulation;
S232, utilize majorized function to obtain the emulation deformation displacement of described test material according to simulation result.
6. a material property evaluating system is characterized in that, comprising:
Experiment test module (1): be used for obtaining the practical distortion displacement of test material by the Experiments of Machanics under the specific operation;
Emulation testing module (2): be used for performance parameter, obtain the emulation deformation displacement of described test material by the Experiments of Machanics under the described specific operation of computer-aided engineering emulation according to the test material of setting;
Parameter acquisition module (3): be used for described practical distortion displacement and described emulation deformation displacement are compared, the deviation of practical distortion displacement and described emulation deformation displacement is less than standard value as described, thinks that then the performance parameter of test material of described setting is the actual performance parameter of described test material; The deviation overgauge value of practical distortion displacement and described emulation deformation displacement as described then changes the performance parameter of the test material of described setting, returns described emulation testing module (2) and handles; And
Application module (4): be used for actual performance parameter, obtain the serviceability of described test material under each operating mode by the Experiments of Machanics under other operating modes of computer-aided engineering emulation according to described test material.
7. material property evaluating system according to claim 6 is characterized in that, the practical distortion displacement when practical distortion displacement when described practical distortion displacement comprises described test material pressurized and described test material resilience; Deformation displacement when the deformation displacement when described emulation deformation displacement comprises the test material pressurized of emulation and the test material resilience of described emulation; Described performance parameter is elastic modulus, yield stress and Poisson ratio.
8. material property evaluating system according to claim 6 is characterized in that, described emulation testing module (2) comprising:
Modelling unit (21): be used for setting up limited element calculation model according to the Experiments of Machanics under the described specific operation;
Setup unit (22): the performance parameter that is used to set test material; And
Simulation unit (23): be used for carrying out the emulation deformation displacement that emulation obtains described test material in the performance parameter of computer-aided engineering described limited element calculation model of loading and described test material.
9. material property evaluating system according to claim 8 is characterized in that, test material is the nonlinear elasticity plastic material as described, then sets the performance parameter of described test material according to engineering experience; Test material is a resilient material as described, then sets the performance parameter of described test material according to linear elasticity contact theory and small deformation hypothesis.
10. material property evaluating system according to claim 8 is characterized in that, described simulation unit (23) comprising:
Emulation subelement (231): be used for carrying out emulation in the performance parameter of computer-aided engineering described limited element calculation model of loading and described test material; And
Optimize subelement (232): be used for utilizing majorized function to obtain the emulation deformation displacement of described test material according to simulation result.
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