CN112903471A - Aging modulus analysis method and system for material containing uniform pores - Google Patents
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Abstract
The invention relates to a method and a system for analyzing aging modulus of a material containing uniform pores. The analysis method and the analysis system are based on the general design idea of off-line detection and a sequence policy, after image data of an A-type characterization test piece at a specific aging temperature, damage data of a B-type characterization test piece after stretching at the specific aging temperature and damage data of a C-type characterization test piece after stretching at the specific aging temperature are respectively obtained, two damage degradation reference moduli are respectively obtained according to the obtained data, then the aging modulus of a uniform pore-containing high polymer material is determined according to the modulus fitting result of the two damage degradation reference moduli, and the analysis requirement of the uniform pore-containing material aging modulus with chemical degradation and damage degradation of the uniform pore material stored in the aging modulus is further completed.
Description
Technical Field
The invention relates to the technical field of molecular material detection, in particular to a method and a system for analyzing aging modulus of a material containing uniform pores.
Background
The polyurethane polymer material has the advantages of high plasticity, high specific strength and the like, and the polymer material subjected to uniform porosity treatment such as foaming and the like can further regulate and control the mechanical property and the thermodynamic property in a large range, and is widely applied to the national defense fields of solid missiles, space shuttles and the like and the national economic industries of modern buildings, oil pipelines, electronic chips and the like.
For the use scenes of protection of space equipment, encapsulation of electronic chips and the like, the penetration of sensitive media such as moisture, oxygen and the like exists in the service environment containing the uniform pore high polymer material; this penetration generally accelerates the chain scission of the material molecular network, causing chemical degradation of the material modulus; the chain scission of the material molecular network usually accompanies the structural evolution of the original pores, thereby bringing about the damage and the degradation of the material modulus. In microscopic finite element structure research, the chemical degradation and damage degradation of the modulus under medium catalysis need to be stripped, so that integrity analysis of the packaging material of the protective coating is supported and analyzed, and system function failure or fault is avoided.
The existing modulus analysis method mainly comprises an off-line experimental analysis method based on a characteristic test piece loading test and an on-line continuous analysis method based on nondestructive testing.
In an experimental analysis method represented by GJB1585A-2004 polyurethane rigid foam plastics, a test piece with a certain configuration is required to be prepared to carry out loading such as stretching, shearing and the like, and the equivalent data of the modulus is obtained by processing data such as loading, deformation and the like. Under the support of accelerated aging methods such as GB/T9640-2008 'accelerated aging test method for soft and hard foam composite materials', equivalent data of modulus under a certain aging section can be obtained through the processes of test piece preparation, accelerated aging and test analysis. Under the off-line experimental analysis method, the preparation and the loading test of a test piece are both carried out on a macroscopic scale, the equivalent data of the modulus is mixed with two parts of chemical degradation and damage degradation, the stripping of the two types of degradation is not supported in principle, the continuous analysis of the aging process cannot be completed, and the credible data of the whole aging process is difficult to provide.
In order to obtain the influence rule of damage characteristics such as uniform pores, microcracks and the like on the modulus, researchers develop technologies such as a representative volume unit, a periodic boundary condition, an electromechanical impedance model and the like under the theoretical framework of damage mechanics, and establish the corresponding relation between information such as the uniform pore characteristic size, the volume fraction and the like and the macroscopic modulus through the structural expression of material characteristics. The method takes the online nondestructive detection technologies such as acoustic emission counting, electromechanical impedance analysis and the like as the core, and continuously analyzes the equivalent data of the modulus under the support of means such as microscopic finite element analysis, parameter inversion and the like; due to the limited detection depth and depth direction resolving power of the nondestructive detection technology, the method has the limitations of insufficient damage characteristic identification precision and low damage degradation analysis quantification degree, and can not identify the influence of chemical degradation.
Aiming at the problem that the chemical degradation can not be identified by the two methods, a sequential coupling analysis method of an oxygen dissipation diffusion-catalytic aging mode and a silicon rubber molecular network fracture mode is constructed by taking non-porous silicon rubber as an object, and a method for calibrating data by means of characteristic element fault sampling analysis and the like is provided. The technology is characterized by the combined application of experimental tests and numerical simulation, solves the difficult problem of continuous analysis of the chemical degradation process under the catalysis of a medium, but does not cover the damage degradation process corresponding to pores.
In summary, the prior art fails to address the need for concurrent analysis of chemical degradation and damage degradation of materials containing uniform porosity.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method and a system for analyzing the aging modulus of a material containing uniform pores.
In order to achieve the purpose, the invention provides the following scheme:
a method for analyzing aging modulus of a material containing uniform pores, comprising:
obtaining an A type characterization test piece, a B type characterization test piece and a C type characterization test piece; the A-type characterization test piece is a micro-focus tomography test piece containing uniform pores; the B-type characterization test piece is a tensile test piece containing uniform pores; the C-type characterization test piece is a tensile test piece without pores;
respectively acquiring image data of the A-type characterization test piece at a specific aging temperature, damage data of the B-type characterization test piece after stretching at the specific aging temperature, and damage data of the C-type characterization test piece after stretching at the specific aging temperature;
determining a first damage degradation reference modulus according to the damage data of the B-type characterization test piece after being stretched at a specific aging temperature and the damage data of the C-type characterization test piece after being stretched at a specific aging temperature;
fitting the first damage degradation reference modulus to obtain a first modulus fitting result;
acquiring deformation data;
determining a second damage degradation reference modulus according to the image data of the A-type characterization test piece at a specific aging temperature;
fitting the second damage degradation reference modulus to obtain a second modulus fitting result;
and obtaining the aging modulus of the polymer material containing uniform pores according to the first modulus fitting result and the second modulus fitting result.
Preferably, the obtaining a type a characterization test piece, a type B characterization test piece, and a type C characterization test piece further includes:
and respectively preparing p groups of the A-type characterization test pieces, p groups of the B-type characterization test pieces and p groups of the C-type characterization test pieces by using the same batch of raw materials.
Preferably, the acquiring of the image data of the a-type characterization test piece at a specific aging temperature specifically includes:
selecting an aging temperature according to the technical requirements of a hot air accelerated aging test of the high polymer material;
according to the hot air accelerated aging rule of the high polymer material, uniformly selecting q equivalent aging moments in the maximum life cycle of the A-type characterization test piece;
putting p groups of the A-type characterization test pieces into hot air acceleration test equipment with the selected aging temperature, and sequentially taking out each group of the A-type characterization test pieces according to q equal aging moments;
respectively carrying out micro-focus tomography on the p groups of the A type characterization test pieces to obtain scanning images;
and performing three-dimensional reconstruction on the scanned image to obtain image data of the A-type characterization test piece at a specific aging temperature.
Preferably, the obtaining of the damage data of the B-type characterization test piece after stretching at a specific aging temperature specifically includes:
putting p groups of B type characterization test pieces into hot air accelerated test equipment with the aging temperature, and sequentially taking out each group of B type characterization test pieces according to q equal aging moments;
and respectively carrying out tensile property tests on the p taken out groups of B type characterization test pieces, and then taking the tensile property mean value of each group of B type characterization test pieces to obtain the damage data of the B type characterization test pieces after being stretched at a specific aging temperature.
Preferably, the obtaining of the damage data of the C-type characterization test piece after stretching at a specific aging temperature specifically includes:
putting p groups of C-type characterization test pieces into hot air accelerated test equipment with the aging temperature, and sequentially taking out each group of C-type characterization test pieces according to q equal aging moments;
and respectively carrying out tensile property tests on the p groups of the C-type characterization test pieces, and then taking the tensile property mean value of each group of the C-type characterization test pieces to obtain the damage data of the C-type characterization test pieces after being stretched at a specific aging temperature.
Preferably, the acquiring deformation data further comprises:
importing the data into structural finite element analysis software, and generating a grid after specific treatment; the specific treatment comprises geometric repair;
determining modulus and Poisson ratio according to technical specifications of high polymer materials, inputting the modulus and the Poisson ratio into the structural finite element analysis software, applying periodic boundary conditions and unit loads, setting solving parameters, and performing finite element analysis to obtain deformation data.
Preferably, the aging modulus of the uniform pore containing polymeric material is edama (t):
Edama(t)＝(E_D(t)+E_Dd(t))/2；
wherein E _ D (t) is the first modulus fitting result, and E _ Dd (t) is the second modulus fitting result.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the aging modulus analysis method for the material containing the uniform pores is based on the general idea of off-line detection and a sequence policy, after image data of an A-type characterization test piece at a specific aging temperature, damage data of a B-type characterization test piece after stretching at the specific aging temperature and damage data of a C-type characterization test piece after stretching at the specific aging temperature are respectively obtained, two damage degradation reference moduli are respectively obtained according to the obtained data, then the aging modulus of the high polymer material containing the uniform pores is determined and obtained according to the modulus fitting result of the two damage degradation reference moduli, and the analysis requirement of the aging modulus of the material containing the uniform pores, in which the chemical degradation and the damage degradation of the uniform pore material are stored, is further completed.
In addition, the invention also provides an aging modulus analysis system of the material containing the uniform pores, which corresponds to the aging modulus analysis method of the material containing the uniform pores, and the analysis system comprises:
the characterization test piece acquisition module is used for acquiring an A-type characterization test piece, a B-type characterization test piece and a C-type characterization test piece; the A-type characterization test piece is a micro-focus tomography test piece containing uniform pores; the B-type characterization test piece is a tensile test piece containing uniform pores; the C-type characterization test piece is a tensile test piece without pores;
the data acquisition module is used for respectively acquiring image data of the A-type characterization test piece at a specific aging temperature, damage data of the B-type characterization test piece after stretching at the specific aging temperature and damage data of the C-type characterization test piece after stretching at the specific aging temperature;
the first damage degradation reference modulus determining module is used for determining a first damage degradation reference modulus according to damage data of the B-type characterization test piece after stretching at a specific aging temperature and damage data of the C-type characterization test piece after stretching at a specific aging temperature;
the first modulus fitting result determining module is used for fitting the first damage degradation reference modulus to obtain a first modulus fitting result;
the deformation data acquisition module is used for acquiring deformation data;
the second damage degradation reference modulus determining module is used for determining a second damage degradation reference modulus according to the image data of the A-type characterization test piece at the specific aging temperature;
the second modulus fitting result determining module is used for fitting the second damage degradation reference modulus to obtain a second modulus fitting result;
and the aging modulus determining module is used for obtaining the aging modulus of the high polymer material containing uniform pores according to the first modulus fitting result and the second modulus fitting result.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flow chart of a method for analyzing an aging modulus of a material containing uniform pores according to the present invention;
FIG. 2 is a schematic structural diagram of an aging modulus analysis system for a material containing uniform pores provided by the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a method and a system for analyzing the aging modulus of a material containing uniform pores, so as to meet the analysis requirement of the aging modulus of the material containing uniform pores, which is combined with the chemical degradation and damage degradation of the material containing uniform pores.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a flow chart of an aging modulus analysis method for a material containing uniform pores according to the present invention, and as shown in fig. 1, the aging modulus analysis method for a material containing uniform pores includes:
step 100: and obtaining an A-type characterization test piece, a B-type characterization test piece and a C-type characterization test piece. The A-type characterization test piece is a micro-focus tomography test piece containing uniform pores. The type B characterization test piece is a tensile test piece containing uniform pores. Type C characterizes the test piece as a tensile test piece without voids.
The preparation process of the A-type characterization test piece, the B-type characterization test piece and the C-type characterization test piece is as follows:
and respectively preparing p groups of A type characterization test pieces, p groups of B type characterization test pieces and p groups of C type characterization test pieces by using the same batch of raw materials. Specifically, the raw materials of the same batch are fed at one time to prepare a micro-focus tomography test piece (A type characterization test piece) containing uniform pores, a tensile test piece (B type characterization test piece) containing uniform pores and a tensile test piece (C type characterization test piece) containing no pores. P groups of A-type, B-type and C-type test pieces are prepared, and each group of the test pieces comprises 3 subsamples. The technical requirements of the test piece such as the configuration, the size and the like are executed according to the technical requirements of a micro-focus tomography device and a tensile test.
Step 101: respectively obtaining image data of the A-type characterization test piece at a specific aging temperature, damage data of the B-type characterization test piece after stretching at the specific aging temperature, and damage data of the C-type characterization test piece after stretching at the specific aging temperature.
The process for acquiring the image data of the A-type characterization test piece, the damage data of the B-type characterization test piece and the damage data of the C-type A-type characterization test piece specifically comprises the following steps:
and selecting the aging temperature T according to the technical requirements of the hot air accelerated aging test of the high polymer material.
According to the hot air accelerated aging rule of the high polymer material, q equivalent aging moments ti (i is 1-p) are uniformly selected in the maximum life cycle of the A-type characterization test piece, wherein t1 corresponds to the initial state, and tp corresponds to the maximum life cycle.
And putting the p groups of A-type characterization test pieces into hot air acceleration test equipment with the aging temperature selected, and sequentially taking out each group of A-type characterization test pieces according to q equal aging moments.
And respectively carrying out micro-focus tomography on the taken p groups of A-type characterization test pieces to obtain scanning images.
And performing three-dimensional reconstruction on the scanned image to obtain image data Da _ i (i is 1-p) of the A-type characterization test piece at the specific aging temperature.
And putting the p groups of B type characterization test pieces into hot air accelerated test equipment with the aging temperature, and sequentially taking out each group of B type characterization test pieces according to q equivalent aging moments.
And respectively carrying out tensile property tests on the p groups of B-type characterization test pieces, and then taking the tensile property mean value of each group of B-type characterization test pieces to obtain damage data Eb _ i (i is 1-p) of the B-type characterization test pieces after being stretched at a specific aging temperature.
And putting the p groups of C-type characterization test pieces into hot air accelerated test equipment with the aging temperature, and sequentially taking out each group of C-type characterization test pieces according to q equal aging moments.
And respectively carrying out tensile property tests on the p groups of C-type characterization test pieces, and then taking the tensile property mean value of each group of C-type characterization test pieces to obtain damage data Ec _ i (i is 1-p) of the C-type characterization test pieces after being stretched at a specific aging temperature.
In order to improve the efficiency and accuracy of the overall analysis, p ═ q is preferred in the present invention.
Step 102: and determining the first damage degradation reference modulus according to the damage data of the B-type characterization test piece after stretching at the specific aging temperature and the damage data of the C-type characterization test piece after stretching at the specific aging temperature. The first damage degradation reference modulus is E _ D _ i (i is 1-10):
E_D_i＝Ec_i—Eb_i。
step 103: and fitting the first damage degradation reference modulus to obtain a first modulus fitting result. The first modulus fit result is E _ d (t):
E_D(t)＝a+b×exp(t)
in the formula, a and b are respectively the result of exponential fitting of the first damage degradation reference modulus E _ D _ i, t is equivalent aging time, and exp (t) is an exponential function.
Step 104: deformation data is acquired. The deformation data is determined by the following process:
and (4) importing the grid into structural finite element analysis software, and generating a grid after specific treatment. The specific treatment includes geometric repair.
Determining the modulus and the Poisson ratio according to the technical specification of the high polymer material, inputting the modulus and the Poisson ratio into structural finite element analysis software, applying periodic boundary conditions and unit loads and setting solving parameters, and then carrying out finite element analysis to obtain deformation data.
Step 105: and determining a second damage degradation reference modulus according to the image data of the A-type characterization test piece at the specific aging temperature. The second damage degradation reference modulus is E _ Dd _ i (i is 1 to p).
Step 106: and fitting the second damage degradation reference modulus to obtain a second modulus fitting result. The second modulus fit result is E _ dd (t):
E_Dd(t)＝m+n×exp(t)
in the formula, m and n are respectively the result of exponential fitting of the second damage degradation reference modulus E _ Dd _ i.
Step 107: and obtaining the aging modulus of the polymer material containing uniform pores according to the first modulus fitting result and the second modulus fitting result. The aging modulus of the polymer material containing uniform pores is Edama (t):
Edama(t)＝(E_D(t)+E_Dd(t))/2。
wherein E _ D (t) is the first modulus fitting result, and E _ Dd (t) is the second modulus fitting result.
In the invention, the micro-focus tomography equipment and the hot air accelerated experiment equipment related to the steps belong to general equipment, and the hot air aging and tensile property test of a test piece, the three-dimensional reconstruction of a scanning image, the average processing of result data, the index fitting and the like all belong to the known operations in the industry and are executed according to the general technical specification and the technical requirements of a representation object.
The advantages of the above-mentioned analysis method of the present invention will be further described by taking 10 sets of characterization samples as examples, and in the practical application, the changes or modifications within the spirit of the present invention will be covered by the present invention.
Step 1: preparation and off-line detection of characterization test piece
(1) Preparation of characterization test piece
Adopting the same batch of raw materials for one-time feeding to prepare a micro-focus tomography test piece (A type) containing uniform pores, a tensile test piece (B type) containing uniform pores and a tensile test piece (C type) containing no pores: 10 groups of A-type, B-type and C-type test pieces are prepared, and 3 subsamples are prepared in each group. The technical requirements of the test piece such as the configuration, the size and the like are executed according to the technical requirements of a micro-focus tomography device and a tensile test.
(2) Offline detection of damage characteristics of A-type test piece
1) Selecting the accelerated aging temperature T according to the technical requirements of the high-molecular hot air accelerated experiment.
2) According to the hot air accelerated aging rule of the high polymer material, 10 equal aging moments are uniformly selected in the maximum life cycle and are marked as ti (i is 1-10), wherein t1 corresponds to the initial state, and t10 corresponds to the maximum life cycle.
3) And putting 10 groups of A-type test pieces into hot air acceleration experiment equipment with the temperature T, and taking out the test pieces sequentially at the time ti (i is 1-10).
4) And carrying out microfocus tomography on the taken A-type test piece, carrying out three-dimensional reconstruction on a scanned image, and sequentially recording the obtained reconstructed image data as Da _ i (i is 1-10).
(3) Tensile detection of B-type test piece and modulus analysis of combined action of two types of degradation
1) 10 groups B type test pieces were subjected to hot air accelerated ageing at a temperature T.
2) And sequentially taking out the samples at the time ti (i is 1-10).
3) And sequentially carrying out tensile property tests on the taken test pieces, carrying out average treatment on each group of the sub-samples, and recording the average value of each group as Eb _ i (i is 1-10), namely the modulus of the test pieces which coexist when the aging time ti is chemical degradation and damage degradation.
(4) Tensile testing of C-type test piece and modulus analysis of chemical degradation
1) 10 groups C test pieces were subjected to hot air accelerated ageing at temperature T.
2) And sequentially taking out the samples at the time ti (i is 1-10).
3) And sequentially carrying out tensile property tests on the taken test pieces, carrying out average treatment on each group of sub-samples, and recording the average value of each group as Ec _ i (i is 1-10), namely the modulus of the chemical degradation at the aging time ti.
Step 2: benchmark modulus (void-free) analysis of damage degradation of homogeneous pore containing polymeric materials
(1) Benchmark modulus analysis of ti damage degradation at time of aging
And the reference modulus of damage degradation at the aging time ti is recorded as E _ D _ i (i is 1-10):
E_D_i＝Ec_i—Eb_i。
(2) baseline modulus analysis for maximum cycle damage degradation
Performing exponential fitting on a reference modulus E _ D _ i (i is 1-10) of damage degradation at the time ti of aging, and recording the result as:
E_D(t)＝a+b×exp(t)
and step 3: proof modulus analysis of damage degradation
(1) Off-line detection of pore characteristics (with voids) of polymer material with uniform pores
1) And carrying out hot air accelerated aging on the 10 groups of C-type test pieces at the temperature T.
2) And sequentially taking out the samples at the time ti (i is 1-10).
3) And performing microfocus tomography on the taken A-type test piece, performing three-dimensional reconstruction on a scanned image, and sequentially recording the obtained reconstructed image data as Da _ i (i is 1-10).
(2) Finite element analysis of polymer material containing uniform pores
1) The reconstructed image data Da _1 corresponding to the equivalent aging time t1 is imported into the structural finite element analysis software.
2) After geometric restoration and other treatment, the grid is generated.
3) Selecting modulus and Poisson ratio according to the technical specification of the high polymer material, and inputting the modulus and Poisson ratio into structural finite element analysis software.
4) Apply periodic boundary conditions and unit load.
5) And after setting solving parameters, carrying out finite element analysis to obtain deformation data.
(3) Time t1 proof modulus analysis of damage degradation
And according to the size of the geometric model determined by Da _1, dividing the load by the deformation data under the unit load to obtain a damage degradation check modulus E _ Dd _ 1.
(4) And other check modulus analysis of damage degradation at the time of aging
And repeating the operations (2) and (3) of the step in sequence to obtain a check modulus E _ Dd _ i (i is 2-10) of damage degradation.
(5) Proof modulus analysis of damage degradation over maximum period
Performing exponential fitting on the check modulus E _ Dd _ i (i is 1-10) of damage degradation at the equivalent aging time ti, and recording the result as:
E_Dd(t)＝m+n×exp(t)
and 4, step 4: treatment of damage degradation modulus
Let the damage degradation modulus be edama (t), then:
Edama(t)＝(E_D(t)+E_Dd(t))/2
in summary, the analysis method provided by the present invention uses the polymer material with uniform pores as an application object, and the following technical problems are solved through the general idea of off-line detection and sequential simulation:
1. aiming at the technical characteristics of the combined action of chemical degradation and damage degradation of the polymer material containing uniform pores, an analysis method capable of being expressed in a quantifiable way is developed.
2. Aiming at the technical requirements of accurate evaluation of objects such as protective coatings for space equipment, packaging materials for electronic chips and the like in the whole period, a continuous analysis method is formed.
In addition, the present invention also provides an aging modulus analysis system for a material containing uniform pores, corresponding to the aging modulus analysis method for a material containing uniform pores provided above, as shown in fig. 2, the analysis system comprising: the device comprises a characterization test piece acquisition module 1, a data acquisition module 2, a first damage degradation reference modulus determination module 3, a first modulus fitting result determination module 4, a deformation data acquisition module 5, a second damage degradation reference modulus determination module 6, a second modulus fitting result determination module 7 and an aging modulus determination module 8.
The characterization test piece acquisition module 1 is used for acquiring an A-type characterization test piece, a B-type characterization test piece and a C-type characterization test piece. The A-type characterization test piece is a micro-focus tomography test piece containing uniform pores. The type B characterization test piece is a tensile test piece containing uniform pores. Type C characterizes the test piece as a tensile test piece without voids.
The data acquisition module 2 is used for respectively acquiring image data of the A-type characterization test piece at a specific aging temperature, damage data of the B-type characterization test piece after stretching at the specific aging temperature, and damage data of the C-type characterization test piece after stretching at the specific aging temperature.
The first damage degradation reference modulus determining module 3 is used for determining a first damage degradation reference modulus according to damage data of the B-type characterization test piece after being stretched at a specific aging temperature and damage data of the C-type characterization test piece after being stretched at a specific aging temperature.
The first modulus fitting result determining module 4 is configured to fit the first damage degradation reference modulus to obtain a first modulus fitting result.
The deformation data acquisition module 5 is used for acquiring deformation data.
The second damage degradation reference modulus determination module 6 is used for determining a second damage degradation reference modulus according to the image data of the A-type characterization test piece at the specific aging temperature.
And the second modulus fitting result determining module 7 is used for fitting the second damage degradation reference modulus to obtain a second modulus fitting result.
And the aging modulus determining module 8 is used for obtaining the aging modulus of the polymer material containing uniform pores according to the first modulus fitting result and the second modulus fitting result.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. A method for analyzing aging modulus of a material containing uniform pores is characterized by comprising the following steps:
obtaining an A type characterization test piece, a B type characterization test piece and a C type characterization test piece; the A-type characterization test piece is a micro-focus tomography test piece containing uniform pores; the B-type characterization test piece is a tensile test piece containing uniform pores; the C-type characterization test piece is a tensile test piece without pores;
respectively acquiring image data of the A-type characterization test piece at a specific aging temperature, damage data of the B-type characterization test piece after stretching at the specific aging temperature, and damage data of the C-type characterization test piece after stretching at the specific aging temperature;
determining a first damage degradation reference modulus according to the damage data of the B-type characterization test piece after being stretched at a specific aging temperature and the damage data of the C-type characterization test piece after being stretched at a specific aging temperature;
fitting the first damage degradation reference modulus to obtain a first modulus fitting result;
acquiring deformation data;
determining a second damage degradation reference modulus according to the image data of the A-type characterization test piece at a specific aging temperature;
fitting the second damage degradation reference modulus to obtain a second modulus fitting result;
and obtaining the aging modulus of the polymer material containing uniform pores according to the first modulus fitting result and the second modulus fitting result.
2. The method for analyzing the aging modulus of a material containing uniform pores according to claim 1, wherein the obtaining of the type a, the type B and the type C characterization test pieces further comprises:
and respectively preparing p groups of the A-type characterization test pieces, p groups of the B-type characterization test pieces and p groups of the C-type characterization test pieces by using the same batch of raw materials.
3. The method for analyzing the aging modulus of the material containing uniform pores according to claim 1, wherein the obtaining of the image data of the A-type characterization test piece at a specific aging temperature specifically comprises:
selecting an aging temperature according to the technical requirements of a hot air accelerated aging test of the high polymer material;
according to the hot air accelerated aging rule of the high polymer material, uniformly selecting q equivalent aging moments in the maximum life cycle of the A-type characterization test piece;
putting p groups of the A-type characterization test pieces into hot air acceleration test equipment with the selected aging temperature, and sequentially taking out each group of the A-type characterization test pieces according to q equal aging moments;
respectively carrying out micro-focus tomography on the p groups of the A type characterization test pieces to obtain scanning images;
and performing three-dimensional reconstruction on the scanned image to obtain image data of the A-type characterization test piece at a specific aging temperature.
4. The method for analyzing the aging modulus of the material containing uniform pores as claimed in claim 3, wherein the step of obtaining damage data of the type B characterization test piece after stretching at a specific aging temperature specifically comprises the following steps:
putting p groups of B type characterization test pieces into hot air accelerated test equipment with the aging temperature, and sequentially taking out each group of B type characterization test pieces according to q equal aging moments;
and respectively carrying out tensile property tests on the p taken out groups of B type characterization test pieces, and then taking the tensile property mean value of each group of B type characterization test pieces to obtain the damage data of the B type characterization test pieces after being stretched at a specific aging temperature.
5. The method for analyzing the aging modulus of the material containing uniform pores as claimed in claim 3, wherein the step of obtaining damage data of the C-type characterization test piece after stretching at a specific aging temperature specifically comprises the following steps:
putting p groups of C-type characterization test pieces into hot air accelerated test equipment with the aging temperature, and sequentially taking out each group of C-type characterization test pieces according to q equal aging moments;
and respectively carrying out tensile property tests on the p groups of the C-type characterization test pieces, and then taking the tensile property mean value of each group of the C-type characterization test pieces to obtain the damage data of the C-type characterization test pieces after being stretched at a specific aging temperature.
6. The method of analyzing aged modulus of a material containing uniform porosity as defined in claim 3, wherein said obtaining deformation data further comprises:
importing the data into structural finite element analysis software, and generating a grid after specific treatment; the specific treatment comprises geometric repair;
determining modulus and Poisson ratio according to technical specifications of high polymer materials, inputting the modulus and the Poisson ratio into the structural finite element analysis software, applying periodic boundary conditions and unit loads, setting solving parameters, and performing finite element analysis to obtain deformation data.
7. The method for analyzing aging modulus of a uniform pore containing material as claimed in claim 1, wherein the aging modulus of the uniform pore containing polymeric material is Edama (t):
Edama(t)＝(E_D(t)+E_Dd(t))/2；
wherein E _ D (t) is the first modulus fitting result, and E _ Dd (t) is the second modulus fitting result.
8. An analytical system for the aged modulus of a material containing uniform porosity, comprising:
the characterization test piece acquisition module is used for acquiring an A-type characterization test piece, a B-type characterization test piece and a C-type characterization test piece; the A-type characterization test piece is a micro-focus tomography test piece containing uniform pores; the B-type characterization test piece is a tensile test piece containing uniform pores; the C-type characterization test piece is a tensile test piece without pores;
the data acquisition module is used for respectively acquiring image data of the A-type characterization test piece at a specific aging temperature, damage data of the B-type characterization test piece after stretching at the specific aging temperature and damage data of the C-type characterization test piece after stretching at the specific aging temperature;
the first damage degradation reference modulus determining module is used for determining a first damage degradation reference modulus according to damage data of the B-type characterization test piece after stretching at a specific aging temperature and damage data of the C-type characterization test piece after stretching at a specific aging temperature;
the first modulus fitting result determining module is used for fitting the first damage degradation reference modulus to obtain a first modulus fitting result;
the deformation data acquisition module is used for acquiring deformation data;
the second damage degradation reference modulus determining module is used for determining a second damage degradation reference modulus according to the image data of the A-type characterization test piece at the specific aging temperature;
the second modulus fitting result determining module is used for fitting the second damage degradation reference modulus to obtain a second modulus fitting result;
and the aging modulus determining module is used for obtaining the aging modulus of the high polymer material containing uniform pores according to the first modulus fitting result and the second modulus fitting result.
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