A method for analyzing specimen damage during cyclic loading based on unidirectional loading data
A technology of cyclic loading and data analysis, which is applied to the analysis of materials, the use of repeated force/pulsation force to test the strength of materials, instruments, etc., can solve the problems of inconsistent damage energy and failure to analyze the damage history of rock samples during cyclic loading, and achieve universal strong effect
Active Publication Date: 2022-07-22
CENT SOUTH UNIV +1
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[0007] In view of the fact that the damage energy calculated under the existing unidirectional loading and cyclic loading is inconsistent, and the damage history of rock samples during cyclic loading cannot be analyzed based on the unidirectional loading results, the present invention proposes a method based on unidirectional loading from the perspective of deformation energy. A method for analyzing specimen damage during cyclic loading to loading data, specifically including the following:
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Embodiment 1
[0048] First, the definitions of the terms involved in this embodiment are explained. The deformation energy is defined as the energy absorbed by the sample (ie, the rock sample) when it reaches the current deformation state. Loading test and cyclic loading test. Among them, the total deformation energy of the specimen is the energy absorbed when loading to failure under the unidirectional loading test, and is the sum of the deformation energies of the initial cycle stage, the intermediate cycle stage and the final loading stage under the cyclic loading test; the cumulative deformation energy is The cumulative deformation energy acting on the specimen during each cyclic loading stage of the cyclic loading test.
[0049] see figure 1 , and then describe in detail the method for analyzing sample damage during cyclic loading based on unidirectional loading data, including the following steps:
[0050] Step S1: take several standard samples of the same type and divide them into ...
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The present invention provides a method for analyzing sample damage during cyclic loading based on unidirectional loading data, comprising: step S1: taking a number of standard samples of the same type and dividing them into two groups; step S2: one group of samples is used for single Loading test in the uniaxial direction until the sample fails, obtain the stress-strain curve of the sample under the uniaxial loading test, and obtain the total deformation energy of the sample under the uniaxial loading test; another set of samples is used for the cyclic loading test until The sample is damaged, and the cumulative deformation energy of the sample at different stages of the cyclic loading test is obtained; Step S3: Calculate the ratio of the cumulative deformation energy to the total deformation energy to obtain the damage of the sample at different stages of the cyclic loading test. The invention adopts the damage calculation method based on deformation energy, which can not only analyze the damage during cyclic loading based on the unidirectional loading data, but also analyze the damage during unidirectional loading based on the cyclic loading data. Sex is stronger.
Description
technical field [0001] The invention relates to the technical field of rock damage calculation, in particular to a method for analyzing sample damage during cyclic loading based on unidirectional loading data. Background technique [0002] During the construction of coal mining, chamber excavation, tunnel excavation, etc., as well as the later operation of the underground structure, the surrounding rock is often in a cyclic loading state. Compared with static load, cyclic load will cause the deterioration of surrounding rock strength and induce secondary disasters. Therefore, relevant researchers have carried out cyclic loading tests to study the mechanical behavior and failure mechanism of rock. In order to characterize the degree of deterioration of the rock sample, researchers put forward the concept of "damage", which indicates the degree of damage to the rock sample, which is usually in the range of 0-1. Among them, 0 means that the rock sample is in a complete state, ...
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IPC IPC(8): G01N3/32G01N3/06
CPCG01N3/32G01N3/06G01N2203/0005G01N2203/0658
Inventor 赵晨阳雷明锋徐间锋曾灿贾朝军肖勇卓宋银涛黄娟
Owner CENT SOUTH UNIV