期刊
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
卷 61, 期 3, 页码 742-761出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2012.11.002
关键词
Bimaterial interface; Dynamic rupture; Supershear transition; Laboratory experiment; Rupture directivity
资金
- University of Queensland
- Australian Research Council [LP0562686]
- Queensland Department of Main Roads
- AuScope Ltd
- National Collaborative Research Infrastructure Strategy (NCRIS) an Australian Commonwealth Government Programme
- Australian Research Council [LP0562686] Funding Source: Australian Research Council
We investigate significant heterogeneous stresses along bimaterial interfaces in laboratory and numerical experiments. These stresses, partially induced by model or experimental configuration, affect the supershear transition length and rupture speed, mode and directivity in uniaxial compression tests and dynamic rupture experiments with bimaterial interfaces. Using numerical simulations we show that normal and tangential stresses at the fault are distorted by the different stress-strain relationships of the materials. This distortion leads to altered supershear transition lengths, higher rupture potencies and amplifies the preference for rupture in the direction of slip of the slower and more compliant material. We demonstrate how this stress-distortion can be decreased in laboratory experiments by using larger specimen samples and in numerical models by using periodic boundary conditions. (C) 2012 Elsevier Ltd. All rights reserved.
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