Meso-structure analysis on instability of dynamic fracture in rock

Cai-ping Liu; Qing-quan Duan

doi:10.1117/12.851493

14 April 2010 Meso-structure analysis on instability of dynamic fracture in rock

Cai-ping Liu, Qing-quan Duan

Proceedings Volume 7522, Fourth International Conference on Experimental Mechanics; 752210 (2010) https://doi.org/10.1117/12.851493
Event: Fourth International Conference on Experimental Mechanics, 2009, Singapore, Singapore

Abstract

On the basis of three point bending dynamic fracture tests with high speed photography, the fracture surfaces are scanned by Scanning Electronic Microscope(SEM)and Laser Profilometer. Instability in rapid rupture of rocks is analyzed from the phenomena that occur in those meso-structures. From energy point of view, the instability mechanism concerning microbranching and fracture mode dependence of crack velocity is discussed. As a result of instability, the critical dynamic fracture energy is an increasing function of crack velocity, rather than a constant material parameter.

Citation Download Citation

Cai-ping Liu and Qing-quan Duan "Meso-structure analysis on instability of dynamic fracture in rock", Proc. SPIE 7522, Fourth International Conference on Experimental Mechanics, 752210 (14 April 2010); https://doi.org/10.1117/12.851493

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