(1. School of Civil Engineering and Architecture，Anhui University of Science and Technology，Huainan，Anhui 232001，China；
2. Engineering Research Center of Underground Mine Construction，Ministry of Education，Anhui University of Science and Technology，Huainan，Anhui 232001，China)
Analysis of energy evolution and damage characteristics of mudstone under cyclic loading and unloading
Abstract：In order to explore the characteristics of energy dissipation and damage of mudstone specimens under cyclic loading，cyclic loading and unloading tests with incremental stress level and fatigue failure tests are carried out. The plastic strain and energy evolution under different load levels are analyzed. Depending on the fatigue tests，the damage variables are defined from the perspective of energy，and the fatigue life of the specimens under different maximums of the cyclic load is predicted. The results show that the plastic strain and dissipated energy in the initial cycle under the same load level are much larger than those of other cycles，and that the dissipated energy ratio in the initial cycle increases rapidly in the elastic segment and increases abruptly when the specimen approaches to failure. The definition of the damage variables from the perspective of energy can avoid the occurrence of negative damage，and a power function relationship between the fatigue life and the load level of specimens is gained.
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2019, Vol. 38 
