What is the effect of crack velocity on the crack mode? Does it change the failure mechanics of rock damaged surface from intergranual to intragranual mode, and why?
For homogeneous materials (typically metals and alloys), clean grain boundaries are stronger than grains. Therefore, transgranular (intragranular) crack propagation can be faster than intergranular (hypothetically). On the other hand, if grain boundaries are decorated by second phase precipitates or segregates, the energy of grain boundary will be less than that of grains, and the fracture mode will be intergranular. Therefore, the fracture mode is more dependent on the energetics of grains and grain boundaries of metallic alloys than the crack velocity itself. For example, fracture modes of impact loading and regular tensile test are influenced by the material properties.
Whereas, rock materials are brittle and non-homogeneous. Therefore, a different behavior could be expected. Still I think crack velocity is a result of external stimuli controlled by material properties - not the cause. Therefore, failure mode may not be influenced by the crack velocity. Crack will follow the least resistant path unless the shock waves of fast moving crack(s) alter/affect the material ahead of the crack front!
Dear Krishnan
My pleasure to receive your reply.
Thank you very much.
Mohammed
Chapter Rock strengths and rock failure criteria
https://www.sciencedirect.com/search/advanced?qs=crack%20velocity%20in%20rock%20specimen%20failure&show=25&sortBy=relevance
Dear Md. Washim
I am glad to receive your response. I will go over the good material you sent. Thanks
All that best
Mohammed
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