CN103278387A - Method for measuring parameters of flexible composite material combining finite element software simulation and experiment - Google Patents
Method for measuring parameters of flexible composite material combining finite element software simulation and experiment Download PDFInfo
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Abstract
The invention discloses a method for measuring parameters of a flexible composite material combining finite element software simulation and experiment, belonging to the technical field of measuring parameters of materials by experiment. The method comprises the following steps of: cooperatively utilizing an experimental method and finite element software on the basis of a Digital Image Correlation (DIC) technology, measuring the full-field three-dimensional deformation of a flexible composite material test specimen with unknown material properties under a working condition through the DIC, performing finite element software simulation on the experiment of the test specimen under the working condition, comparing the simulation result of the finite element software with the result of the test specimen displayed by a digital image in a real experiment, and the material parameters of the test specimen input in the finite element software are true values if the simulation result of the finite element software is identical with the true result of the test specimen displayed by the digital image. The method can be used for more accurately and quickly measuring the parameters of the material and determining the material properties. The method disclosed by the invention is simple to operate, strong in repeatability, high in reliability and capable of more accurately measuring the material parameters of the flexible composite material.
Description
Technical field
The invention belongs to measuring material parameter technical field, relate to the method for measuring of a kind of flexible composite material parameter.
Background technology
Flexible composite with distinct advantages is more and more used in numerous fields such as Aero-Space, civil engineering work, mechanical engineering, automobile engineering, energy project and medical science, correspondingly increased the demand of flexible composite and structural design thereof and evaluation, and the material parameter data are bases of these demands accurately.An object lesson of flexible composite: fiber-reinforced films.Compare with common film, fiber-reinforced films is to be embedded with in the middle of the film laterally, or fiber longitudinally, perhaps all is embedded with fiber (fabric enhanced film) at both direction, to improve the material mechanical performance of film.
The principle of DIC is to use black-white CCD camera shooting testee at surface image stressed or the temperature distortion process, compares the image after being out of shape afterwards again and is out of shape preceding reference image, and then obtain three direction displacements of each coordinate points on the testee surface
Or strain
Can obtain tens thousand of extremely hundreds thousand of above data points with the DIC method, just as stick same number of dummy strain rule on the testee surface.Therefore, we can just obtain the deformation data of the whole audience in measurement once.
The finite element software analogue technique can be carried out virtual experimental, real test specimen in the laboratory is carried out modeling in software that is:, is the film of a rectangle such as test specimen, just can draw a rectangle in finite element software; Material properties with film is given to this rectangle by software then, and this rectangle just can have been treated as real film like this; Operating mode that real film is suffered imposes on software by software and sets up model at last, finds the solution the result that just can arrive simulated experiment by software.
When the character of material own is simple, as isotropic material, its material parameter comprises an elastic modulus E, a shear modulus G, a Poisson ratio v.Design better simply experiment and just can record material parameter.But flexible composite is owing to constitute complexity, and material parameter is numerous, needs the experiment of the various complexity of design to measure each parameter of material respectively usually, and the workload of experiment is very big; And when the character of material itself is not well predicted, even the related experimental methods that material parameter is decided in tie-in all can't design.At this moment, just can unite the simulation of experimental technique and finite element software, use the digital picture correlation technique that the test specimen after testing is carried out 3 D deformation and measure, from digital picture, obtain the true strain data of test specimen, as the displacement of all directions
, the line strain of all directions
Deng; By finite element software this experiment is simulated, from the result of simulation gained, also can obtain the deformation data of test specimen.
By adjusting the material parameter of test specimen model in the finite element model, make the deformation result of simulation move closer to the true strain result of test specimen in the experiment of digital picture reflection, determine the material parameter of flexible composite test specimen.
Summary of the invention
Mensuration at the flexible composite material parameter, the present invention proposes a kind of for the method for measuring of flexible composite material parameter, that is: based on the flexible composite material parameter assay method of the associating experiment measuring of digital picture correlation technique and finite element software simulation.
The flexible composite material parameter assay method of uniting experiment and finite element software simulation based on the digital picture correlation technique of the present invention, need one group of experiment of design, need finite element software, need DIC technology and products thereof CCD camera, the VIC3D/2D system comprises the steps:
1, makes speckle at test specimen, determine several unique points at test specimen then, carry out mark;
2, according to the character of test specimen self, for test specimen designs one group of experiment, experiment condition will guarantee that material deformation is subjected to each parameter influence;
3, take the digital picture on test specimen surface in the experimentation by DIC;
4, with finite element software above-mentioned experiment is simulated, the material parameter that test specimen is initial, rule of thumb value is set or with reference to the data setting in the list of references;
5, the digital picture of finite element software being simulated test piece deformation in the captured experiment of the deformation pattern of gained and step 3 compares, adjust the material parameter of test specimen in the finite element, the deformation pattern that makes finite element software simulate gained moves closer to the digital picture of test piece deformation in the experiment;
6, after deformation pattern that dual mode obtains is close, set up the function of mould of the difference of the dual mode gained deformation data that can describe selected unique point place, when the material parameter of adjusting finite element model made functional value less than a particular value, the material parameter of finite element model was exactly the authentic material parameter of test specimen.
The present invention is based on DIC digital picture correlation technique and unite utilization experimental technique and finite element software, record the whole audience 3 D deformation of flexible composite test specimen under a kind of operating mode of material character the unknown by DIC, and the finite element software simulation is carried out in the test under this operating mode to this test specimen.The deformation result of finite element software simulation and the real deformation result of test specimen of digital picture demonstration are compared, when the legitimate reading of the test specimen that shows when the simulation gained result of finite element and digital picture coincide, the test specimen model of in finite element software, importing material parameter be exactly the real material parameter of test specimen.Can be more accurate, measure the parameter of material more efficiently, determine material character.The present invention is simple to operate, and is repeatable strong, reliability height, material parameter that can more accurate mensuration flexible composite.Determine to have very important meaning for the material parameter of flexible composite.
Description of drawings
Fig. 1 is for to carry out biaxial stretch-formed experiment to test specimen;
Fig. 2 is the digital picture of test piece deformation in the experiment that obtains with the DIC technology;
Fig. 3 is the displacement diagram of ABAQUS simulation twin shaft stretching experiment gained Y-direction;
Fig. 4 is for using Origin software to the data comparison diagram on simulation gained data and the digital picture.
Embodiment
Embodiment one: the flexible composite material parameter assay method of uniting experiment and finite element software simulation based on the digital picture correlation technique comprises the steps:
1, according to the character of test specimen self, for test specimen designs one group of experiment, experiment condition will guarantee that material deformation is subjected to each parameter influence.
The experimental design principle is that operating mode is wanted simply, can avoid like this because the artificial systematic error that the design of operating mode is caused still will guarantee under the designed operating mode, and the mechanical behavior of material is subjected to the combined influence of the material parameter of measuring and monitoring the growth of standing timber.Be orthotropic material as material, its material parameter need be measured E
1, E
2, E
3, v
12, v
13, v
23, G
1, G
2, G
3
Because DIC distinguishes different points by the different gray scales of each point of recognition object surface, therefore before experiment, make speckle on the test specimen surface earlier.Make speckle two kinds of ways are arranged usually: earlier at test specimen surface spray one deck white paint, again at the pitch-dark formation speckle of white paint surface spray one deck; Perhaps form speckle on the white paint surface with black pen point point.
Also to choose the several unique points that will carry out two kinds of deformation data contrasts, carry out mark.
Choosing of the lip-deep unique point of test specimen will disperse as far as possible, in order to avoid inevitable systematic error is amplified.Unique point can not be chosen very little, otherwise can influence measuring accuracy.
2, take the digital picture on testee surface in the experimentation by DIC, digital picture not only can reflect various deformation patterns, can also obtain the various deformation datas at needed unique point place.
3, with finite element software above-mentioned experiment is simulated, the material parameter of initial test specimen, rule of thumb value is determined or with reference to the data setting in the list of references.
4, digital picture and the deformation data of finite element software being simulated test piece deformation in the experiment that the deformation data of gained and image and step 2 take compares:
Contrast the deformation pattern that dual mode obtains earlier, adjust the material parameter of test specimen in the finite element, the deformation pattern that makes finite element software simulate gained moves closer to the digital picture of test piece deformation in the experiment.
After deformation pattern that dual mode obtains is close, adjust the material parameter of test specimen in the finite element, make the deformation data of unique point place finite element software simulation gained approach in the experiment deformation data at respective point place on the digital picture.
5, the function of the mould of one of the design difference that can describe selected unique point place dual mode gained deformation data (as the face outer displacement), function can be as the case may be by user oneself design, its principle of design is to enable reflection comprehensively to be used for the difference of comparative test result and analog result.Functional value is that two groups of data are imported in this function and can be calculated, and when this functional value during less than the value of a setting, can think that the material parameter that sets has approached real material parameter to a certain extent.This setting value neither be fixed, can set a bigger value earlier in actual applications, such as 0.1, after the material parameter of adjustment model makes functional value less than 0.1, for the material parameter that makes model more near the actual value of material, will turn setting value down, such as 0.02, continue the material parameter of adjustment model like this, make functional value less than 0.02.At this moment resulting material parameter is just more near real material parameter.
In the method, because the material properties of the test specimen of simulating is unknown, we can only or consult the approximate range that document obtains its material properties by experience.So the material parameter that institute's established model is given is inaccurate, finite element analogy result of experiment and the real deviation to some extent of testing, namely the True Data of Mo Ni deformation data and experiment has a deviation, and when the material properties of giving and actual value deviation are big, deformation data and the true strain data meeting deviation of simulation gained are bigger, this both can find out by the digital picture of DIC system gained and the deformation result figure contrast of finite element software simulation gained, the function of the mould of difference that also can be by characterizing two kinds of deformation datas reflects, and the discrete point of two kinds of deformation datas can also be fitted to two curves respectively under same coordinate system.By adjusting the setting of test specimen material parameter in the finite element, make the difference of the true strain of the shown test specimen of distortion that finite element software simulation shows and digital picture in testing as far as possible little, institute's setting parameter just is considered to the material parameter of flexible composite test specimen in the finite element like this.
Embodiment two: the material parameter with orthotropic material is determined as example, introduces the assay method to the flexible composite material parameter of uniting experiment and finite element software based on the digital picture correlation technique:
1, makes speckle at the test specimen of orthotropic material, determine 10 unique points of relatively disperseing at test specimen, carry out mark, this test specimen is carried out one group of biaxial stretch-formed experiment (as Fig. 1).
2, take the digital picture (as Fig. 2) on test specimen surface in the experimentation by DIC.
3, simulate above-mentioned biaxial stretch-formed experiment with ABAQUS, the selection material model is orthotropy, original material parameter (E
1, E
2, E
3, v
12, v
13, v
23, G
1, G
2, G
3) earlier rule of thumb value is determined or with reference to the data setting in the list of references (as Fig. 3).
4, the digital picture of test piece deformation compares in the deformation pattern of ABAQUS being simulated gained and the experiment, if both have notable difference, material parameter to the ABAQUS model is carried out coarse adjustment, and the deformation pattern that makes ABAQUS simulate gained moves closer to the digital picture of test piece deformation in the experiment.When dual mode gained deformation pattern is similar, carry out the parameter fine setting, the deformation data (step 5-7) at respective point place on the digital picture during the deformation data that makes unique point place finite element software simulate gained approaches and tests.
5, extract the real displacement of each Y-direction of 10 unique points on the digital picture of testing test specimen
(subscript exp represents it is the deformation data of experiment gained).
6, established one group of material parameter (being that step 4 is carried out the material parameter that coarse adjustment obtains for the last time), through the calculating of finite element software ABAQUS, the displacement of the respective point Y-direction on the finite element analogy gained result is
(being designated as mod represents it is finite element analogy gained deformation data down), input function in MATLAB software
, and give function with two groups of data assignment
7, constantly adjust the material parameter of ABAQUS model, carry out the operation of the 5th step repeatedly, utilize MATLAB software to calculate
Value.When
The time, the material parameter of ABAQUS model is exactly the authentic material parameter of test specimen.
Also can two groups of data fittings be become curve with Origin software, adjust the material parameter of establishing in the ABAQUS model repeatedly, make unique point fits on the ABAQUS model curve gradually with the experiment digital picture on the curve that fits to of the test specimen characteristic point data that shows overlap (as Fig. 4).
Embodiment three: present embodiment is determined as example with the material parameter of anisotropic material, introduces the assay method to the flexible composite material parameter of uniting experiment and finite element software based on the digital picture correlation technique:
1, makes speckle at the test specimen of anisotropic material, determine 15 unique points of relatively disperseing at test specimen, carry out mark, this test specimen is carried out one group draw-bend-turn round coupling experiment.
2, take the digital picture on test specimen surface in the experimentation.
3, with above-mentioned the drawing of ABAQUS simulation-bend-turn round coupling experiment, selections material model is anisotropy, and the original material parameter rule of thumb is worth definite earlier or with reference to the data setting in the list of references.
4, the digital picture of test piece deformation compares in the deformation pattern of ABAQUS being simulated gained and the experiment; Constantly adjust the material parameter of ABAQUS model, the deformation pattern that makes ABAQUS simulate gained moves closer to the digital picture of test piece deformation in the experiment.When dual mode gained deformation pattern is similar, carry out the parameter fine setting.
5, extract the strain of each directions X of 15 unique points on the digital picture of testing test specimen
6, established one group of material parameter after, the strain of respective point directions X is on the ABAQUS model
, input function in MATLAB software
, and give function with two groups of data assignment
7, constantly adjust the material parameter of ABAQUS model, carry out the operation of the 6th step repeatedly, utilize MATLAB software to calculate
Value.When
The time, the material parameter of ABAQUS model is exactly the authentic material parameter of test specimen.
Embodiment four: present embodiment is determined as example with the material parameter of anisotropic material, introduces the assay method to the flexible composite material parameter of uniting experiment and finite element software based on the digital picture correlation technique:
1, makes speckle at the test specimen of anisotropic material, determine 15 unique points of relatively disperseing at test specimen, carry out mark, this test specimen is carried out one group draw-bend-turn round coupling experiment.
2, take the digital picture on test specimen surface in the experimentation.
3, with above-mentioned the drawing of ABAQUS simulation-bend-turn round coupling experiment, selections material model is anisotropy, and the original material parameter rule of thumb is worth definite earlier or with reference to the data setting in the list of references.
4, the digital picture of test piece deformation compares in the deformation pattern of ABAQUS being simulated gained and the experiment; Constantly adjust the material parameter of ABAQUS model, the deformation pattern that makes ABAQUS simulate gained moves closer to the digital picture of test piece deformation in the experiment.When dual mode gained deformation pattern is similar, carry out the parameter fine setting.
5, extract the strain of each directions X of 15 unique points on the digital picture of testing test specimen
6, established one group of material parameter after, the strain of respective point directions X is on the ABAQUS model
, with two groups of data importings in the Origin drawing software, shown two curves of Origin.Curve A is formed by the strain value match on the unique point directions X on the test specimen that experimentizes, and curve B is formed by the strain match on the corresponding unique point directions X on the finite element model.
7, constantly adjust the material parameter of ABAQUS model, carry out the 6th step operation repeatedly, when curve B during infinitely near curve A, the material parameter of ABAQUS model is exactly the authentic material parameter of test specimen.
Claims (3)
1. unite finite element software simulation and the flexible composite material parameter method for measuring of testing for one kind, it is characterized in that described method step is as follows:
(1) makes speckle at test specimen, determine several unique points at test specimen then, carry out mark;
(2) according to the character of test specimen self, for test specimen designs one group of experiment, experiment condition will guarantee that material deformation is subjected to each parameter influence;
(3) take the digital picture on test specimen surface in the experimentation by DIC;
(4) with finite element software above-mentioned experiment is simulated, the material parameter of initial test specimen, rule of thumb value is determined or with reference to the data setting in the list of references;
(5) digital picture of finite element software being simulated test piece deformation in the captured experiment of the deformation pattern of gained and step 3 compares, adjust the material parameter of test specimen in the finite element, the deformation pattern that makes finite element software simulate gained moves closer to the digital picture of test piece deformation in the experiment;
(6) after deformation pattern that dual mode obtains is close, set up the function of mould of the difference of the dual mode gained deformation data that can describe selected unique point place, when the material parameter of adjusting finite element model made functional value less than a particular value, the material parameter of finite element model was exactly the authentic material parameter of test specimen.
2. associating finite element software simulation according to claim 1 and the flexible composite material parameter method for measuring of testing, the way that it is characterized in that described making speckle is: earlier at test specimen surface spray one deck white paint, again at the pitch-dark formation speckle of white paint surface spray one deck.
3. associating finite element software simulation according to claim 1 and the flexible composite material parameter method for measuring of testing, the way that it is characterized in that described making speckle is: at test specimen surface spray one deck white paint, form speckle on the white paint surface with black pen point point more earlier.
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Application publication date: 20130904 |