A method for judging the threshold value of rock crack stress based on full-field strain measurement
A technology of strain measurement and threshold value, which is applied in the direction of measuring devices, preparation of test samples, and application of stable tension/compression to test the strength of materials, etc. The number of strain gauges is limited and other issues, to achieve the effect of low test environment requirements, convenient results, and good applicability
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[0052] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the following will further explain how the present invention is implemented in conjunction with the accompanying drawings and specific implementation methods.
[0053] refer to figure 1 As shown, a method for judging rock crack stress threshold based on full-field strain measurement provided by the present invention comprises the following steps:
[0054] S1, making rock samples;
[0055] S2, performing speckle processing on the surface of the rock sample;
[0056] S3, test loading, collecting images of the speckle surface of the rock sample during the test loading process;
[0057] S4, calculating the full-field displacement of the speckle surface of the rock sample;
[0058] S5, calculating the full-field strain of the speckle surface of the rock sample;
[0059] S6, calculating the rock sample volume strain, elastic volume strain and cr...
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