Mechanism of rock fatigue damage in terms of fracturing modes
Mechanism of rock fatigue damage in terms of fracturing modes
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DOI：
10.1016/j.ijfatigue.2012.02.008
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发表时间：
2012-10-01
影响因子：
6
通讯作者：
Williams, D. J.
中科院分区：
文献类型：
--
作者：
Erarslan, N.;Williams, D. J.
一个新的研究成果所描述的是间接拉伸循环加载对岩石断裂韧性（K-IC）的影响的观察。对于最高振幅动态循环载荷试验，静态K-IC的最大降低为46%。第二系列的循环试验表明，45度和70度倾斜的V形切口裂纹从循环加载试验开始时就打开了，而在单调加载下，V形切口裂纹闭合直至失效。与静态断裂相比，详细的扫描电子显微镜（SEM）检查表明，在布里斯班凝灰岩的疲劳损伤的强烈影响的基质的失败，由于沿晶断裂和穿晶断裂，而光滑和明亮的裂纹形成沿着解理面在静态载荷下。(C)2012爱思唯尔有限公司保留所有权利。
A novel outcome of the research described is the observation of the effect of indirect tensile cyclic loading on the fracture toughness (K-IC) of rocks. A maximum reduction of the static K-IC of 46% was obtained for the highest amplitude dynamic cyclic loading test. A second series of cyclic tests showed that the 45 degrees and 70 degrees inclined chevron notch cracks opened from the beginning of the cyclic loading test, whereas under monotonic loading, the chevron notch cracks closed up to failure. When compared with static rupture, the detailed scanning electron microscope (SEM) examinations showed that fatigue damage in Brisbane tuff is strongly influenced by the failure of the matrix, due to both intergranular fracturing and transgranular fracturing, whereas smooth and bright cracks were formed along cleavage planes under static loading. (C) 2012 Elsevier Ltd. All rights reserved.