循环加卸载下泥岩能量演化与损伤特性分析

doi:10.13722/j.cnki.jrme.2019.0153

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摘要为探究循环荷载下泥岩试件能量耗散与损伤特性，进行荷载等级逐渐增加的循环加卸载试验与等荷载疲劳试验。分析不同荷载水平下各循环塑性应变与能量密度变化，以疲劳试验为参照，从能量角度对损伤变量进行定义，并对不同荷载上限疲劳试验中试件的疲劳寿命进行了预测。结果表明：同一等级荷载下初始循环塑性应变及耗散能密度远大于其他循环；初始循环耗散能占比从试件进入弹性段开始加速增大，临近破坏时有突增；从能量角度定义损伤变量可避免“负损伤”的出现，预测得到泥岩试件的疲劳寿命与荷载水平呈幂函数关系。

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	徐颖1
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	李成杰1
	郑强强1
	倪贤1
	王倩倩1

关键词 ：岩石力学, 循环加卸载, 能量耗散, 损伤变量, 疲劳寿命

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.

Key words： rock mechanics cyclic loading and unloading energy dissipation damage variable fatigue life

引用本文:

徐颖1，2，李成杰1，郑强强1，倪贤1，王倩倩1. 循环加卸载下泥岩能量演化与损伤特性分析[J]. 岩石力学与工程学报, 2019, 38(10): 2084-2091.
XU Ying1，2，LI Chengjie1，ZHENG Qiangqiang1，NI Xian1，WANG Qianqian1. Analysis of energy evolution and damage characteristics of mudstone under cyclic loading and unloading. , 2019, 38(10): 2084-2091.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2019.0153 或 http://www.rockmech.org/CN/Y2019/V38/I10/2084

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