Method for testing shear strength of brittle material by utilizing concentric cylindrical test sample
A brittle material, shear strength technology, applied in the direction of using a stable shear force to test the strength of the material, can solve the problems of cutting edge stress concentration, inability to measure bending stress, low results, etc., to achieve the effect of eliminating stress concentration
Inactive Publication Date: 2010-09-01
CENT SOUTH UNIV +1
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Problems solved by technology
But the disadvantages are also obvious, that is, the bending stress cannot be measured, and the cutting edge is prone to stress concentration
For the above reasons, the results obtained tend to be low
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Abstract
The invention provides a method for testing the shear strength of a brittle material by utilizing a concentric cylindrical test sample, which is characterized by uniformly imposing pressure on the end surface of the concentric cylindrical test sample, recording the breaking load P tau, and calculating according to the following formula for obtaining the shear strength tau of the brittle material: wherein R is the radius of an internal cylinder of the test sample, and H is the common convergence height of the internal cylinder and an external cylinder. The adoption of the method can measure the shear strength of the brittle material more accurately.
Description
technical field The invention belongs to the field of material performance testing, and relates to a method for testing the shear strength of brittle materials by using concentric cylindrical samples. technical background The shear resistance of brittle materials such as rocks is an important property. At present, the shear performance of brittle materials is mainly determined by variable-angle plate test and double (single) shear test. The variable-angle plate test requires the material sample to be processed into a cube form, and the shear test is performed using a variable-angle plate shear tester. Using this method, the shear stress values under different normal stresses can be obtained, and then the shear parameters internal friction angle (°) and cohesion (C) on the shear surface can be obtained. It should be noted that the key to the test using the variable-angle plate method is to ensure that the sample is uniformly stressed throughout the test process and can b...
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IPC IPC(8): G01N3/24
Inventor 李夕兵宫凤强尹土兵杜晶
Owner CENT SOUTH UNIV