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Method for constructing full-stage creep model of polymer bonded composite material

A composite material and construction method technology, which is applied in the field of full-stage creep model construction of polymer bonded composite materials, can solve the problem of not considering the change of temperature and holding stress, etc., so that the experimental data is simple, feasible and achievable, and the complexity is reduced degree of effect

Active Publication Date: 2021-06-29
中国工程物理研究院研究生院 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The model proposed by Sudduth et al. can describe the material response of the whole stage creep with three parameters, but it does not consider the changes of temperature and holding stress

Method used

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  • Method for constructing full-stage creep model of polymer bonded composite material
  • Method for constructing full-stage creep model of polymer bonded composite material
  • Method for constructing full-stage creep model of polymer bonded composite material

Examples

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specific Embodiment 1

[0069] The present invention is a method for constructing a full-stage creep model of a polymer bonded composite material, considering the effects of temperature and maintaining stress, as shown in Figures 1 to 7, and the specific implementation steps are as follows:

[0070] In step 1, the creep data of samples of polymer bonded composite materials at different test temperatures are obtained as test data.

[0071] The test data can directly use historical test data, or can be obtained through actual tests. The test data obtained through the actual test is as follows: according to the actual engineering needs, research needs, and the number of samples in stock, select the test temperature, maintain the stress range, determine the test conditions within the temperature and maintain stress range, and set each test condition The number of samples of the polymer bonded composite material is kept in a temperature box for compression creep test to obtain the stress, strain and corre...

specific Embodiment 2

[0152] Using the creep data, the generality of the model constructed by the whole-stage creep model construction method of the polymer bonded composite material proposed by the present invention can be further verified. The specific test temperature and holding stress are shown in Table 3.

[0153] Corresponding creep data such as Figure 8 shown.

[0154] table 3

[0155]

[0156]

[0157] Using the data in the literature, based on the creep model of specific example 1, on the basis of not adjusting the model structure, only using new data to recalibrate the model parameters, using the operation method from step 2.1 to step 2.5, the creep can be obtained Variable model parameters, as shown in formula (49).

[0158]

[0159] Figure 9 (a)-9 (b) shows the comparison between the prediction results of the proposed model and the reference data, where the scattered points are third-party data, and the curve is the result of modeling using third-party data. The model describ...

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Abstract

The invention provides a method for constructing a full-stage creep model of a polymer bonded composite material by considering temperature and holding stress effects. The method comprises the following steps: acquiring strain time data of a sample of the polymer bonded composite material at different test temperatures and holding stresses as test data; processing the data into strain rate time data; by adopting a bathtub curve model as a basic model, establishing a strain rate time model in a logarithm domain, and acquiring a strain time curve by adopting a Runge-Kutta method; acquiring the relation between the model parameters and the temperature and the holding stress through fitting, acquiring the relation between the fracture time and the temperature and the holding stress. The polymer bonded composite material full-stage creep model considering the temperature and holding stress effect can be obtained. According to the model, the whole-stage creep relationship of the material is combined with the temperature and the holding stress, and the creep model of the polymer bonded composite material can be obtained on the basis of using a small number of model parameters and can be used for predicting the service lifetime of the material.

Description

technical field [0001] The invention relates to the field of materials, in particular to a general method for constructing a full-stage creep model of a polymer bonded composite material in consideration of changes in temperature and holding stress. Background technique [0002] Polymer bonded composites have been widely used in engineering components subjected to thermomechanical loads due to their corrosion resistance, high tensile strength, light weight and ease of handling. To assess the durability of these components, understanding the creep behavior of materials is a key issue. [0003] A large number of experiments have shown that the creep characteristics of polymer bonded composites depend on material properties such as additive content, particle size, and external parameters such as temperature and humidity. The creep behavior of polymer materials includes at least an initial creep stage and a stable creep stage. The characteristic of the initial creep stage is t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G16C60/00G01N3/32
CPCG16C60/00G01N3/32
Inventor 关雪飞段晓畅袁洪魏唐维何晶靖
Owner 中国工程物理研究院研究生院
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