METHOD OF MEASUREMENT OF STRESS AND STRAIN WHOLE PROCESS MATERIAL PARAMETER BY USING OF HYDROSTATIC PRESSURE UNLOADING
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United States of America Patent
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Aug 18, 2016
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Jul 30, 2015
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Feb 17, 2015
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Abstract
A method of measurement of stress and strain whole process material parameter by using method for hydrostatic pressure unloading is disclosed, which is directed to the cyclic test of loading and unloading. With the assumption that only the deviator stress generates damage to the sample, a test method of the hydrostatic pressure unloading is invented in order to calculate mechanical parameters in different stages of stress and strain. Nine mechanical parameters can be calculated in connection with hexahedral pores connecting samples in the true triaxial test. Six mechanical parameters can be calculated for non-pores connecting samples. Nine mechanical parameters can be calculated in connection with hexahedral pores connecting samples in the traditional triaxial test. Six mechanical parameters can be calculated for non-pores connecting samples. The specific expressions and test methods are provided.
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