Criteria of Dynamic Crack Initiation

[+] Author and Article Information
Masaaki Watanabe

Faculty of Engineering, Kinki University, Takaya, Higashi-Hiroshima, Hiroshima 729-17, Japan

J. Appl. Mech 61(1), 221-223 (Mar 01, 1994) (3 pages) doi:10.1115/1.2901410 History: Received October 17, 1991; Revised December 05, 1992; Online March 31, 2008


A criteria of dynamic crack initiation is proposed as

Klcdyn = Klc σcdyn.σc tq.s.tαS/2
for t ≤t q.s. , where K lc dyn. is the dynamic critical stress intensity factor for initiation and K lc , the static fracture toughness. σc and σc dyn. are critical stresses for a growth of microcracks generated at the tip of a crack, in quasi-static and dynamic loading conditions, respectively. t q.s. is the characteristic time of quasi-static growth of a crack and t is a loading time. αs is a positive number. This criteria is compared with various different experiments and found to be in qualitative agreement with them.

Copyright © 1994 by The American Society of Mechanical Engineers
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