A MODEL OF CRACK-GROWTH IN MICROCRACKED ROCK
A MODEL OF CRACK-GROWTH IN MICROCRACKED ROCK
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DOI：
10.1016/0148-9062(93)90028-c
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发表时间：
1993-12-01
期刊：
影响因子：
--
通讯作者：
GERMANOVICH, LN
中科院分区：
文献类型：
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作者：
DYSKIN, AV;GERMANOVICH, LN
本文考虑了微裂纹控制的裂纹扩展，提出了一个大规模裂纹扩展模型。裂纹前沿的体积元素的连续破裂使裂纹得以扩展，并使其有效增厚。体积单元的大小取决于两种效应之间的竞争：(A)由于裂纹厚度的增加而减少裂纹前沿的应力集中，以及(B)由于体积单元的尺寸的增加而降低体积单元的强度，换言之，体积单元的内部尺度效应取决于体积单元内微裂纹的分布。结果表明，可以从拉伸强度尺度效应的实验室测量来评估大尺度(宏观)断裂韧性。
This paper considers microcrack-governed crack propagation and proposes a model for large-scale crack growth. The consecutive fracturing of volume elements at the crack front enables the crack to propagate and makes it effectively thick. The volume element size is determined from the competition between two effects: (a) reduction of the stress concentration at the crack front due to increase of the crack thickness, and (b) reduction of the volume element strength due to increase of its size or, in other words, the internal scale effect governed by distribution of the microcracks within the volume element. It is shown that the large-scale (macroscopic) fracture toughness may be assessed from laboratory measurements of the tensile strength scale effect.