Method for accurately determining high-temperature mechanical property parameters of heat preventing material based on digital image related technology

Abstract

The invention discloses a method for accurately determining high-temperature mechanical property parameters of a heat preventing material based on the digital image related technology, and belongs to the technical field of material parameter measuring through tests. The deformation situation of the material in the test process is acquired based on the digital image related technology, and the mechanical property parameters of the material at the vacuum (inflation) and certain temperature are determined according to the load and the temperature data provided by a high-temperature mechanical test machine. According to the method, blue light is adopted for supplementing light, a blue light filter is added in front of a DIC optical measuring lens, scattered spots splashed to a sample are baked, and a DIC can be used accurately at the high temperature. The method is easy to operate and high in repeatability, the heat shock of the material can be simulated, the mechanical response of the heat preventing material at the high temperature can be more accurately and completely reflected, the overall material deforming situation which cannot be observed and the transverse deformation coefficients which cannot be measured can be visually reflected, and the material property parameters can be represented more vividly and effectively.

Description

technical field [0001] The invention belongs to the technical field of test and measurement of material parameters, and relates to a test method for the test parameters of material mechanical properties of heat-resistant materials under high temperature conditions. Background technique [0002] Heat-resistant materials such as ultra-high temperature ceramics and C / C composite materials are widely used in national defense, aerospace, modern space technology and other fields to meet their needs for heat insulation systems under high temperature conditions. Under high temperature conditions, not only certain thermal properties need to be met, but also higher requirements are placed on the mechanical properties of materials. This is due to the short time when the material reaches high temperature from normal temperature, which will cause a strong thermal shock to the material and generate thermal stress. Therefore, effectively simulating this thermal shock and characterizing th...

AI Technical Summary

Problems solved by technology

However, under high temperature conditions, the material itself will heat up, shine, and produce red light, which will have a great impact on speckle observation, and may even fail to observe speckle.

More importantly, the speckle will gradually fall off the surface of the sample under high temperature conditions, making it impossible to obtain relevant data

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