A MODEL OF CRACK-GROWTH IN MICROCRACKED ROCK

被引：28

作者：

DYSKIN, AV ^{[1
]}

GERMANOVICH, LN ^{[1
]}

机构：

[1] UNIV OKLAHOMA,NORMAN,OK 73019

来源：

INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES & GEOMECHANICS ABSTRACTS | 1993年 / 30卷 / 07期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0148-9062(93)90028-C

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

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.

引用

页码：813 / 820

页数：8

共 28 条

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[2]

Bazant ZP, 1986, APPLIED MECHANICS RE, V39, P675, DOI DOI 10.1115/1.3143724

[3] EVALUATION OF ENERGY-RELEASE RATE IN THE CRACK MICROCRACK INTERACTION PROBLEM [J].