Dynamic Crack Curving and Branching in Line-Pipe

[+] Author and Article Information
M. Ramulu, A. S. Kobayashi, B. S.-J. Kang

Department of Mechanical Engineering, University of Washington, Seattle, Wash. 98195

J. Pressure Vessel Technol 104(4), 317-322 (Nov 01, 1982) (6 pages) doi:10.1115/1.3264223 History: Received August 28, 1982; Online November 05, 2009


The newly derived dynamic crack curving and crack branching criteria are briefly reviewed. The two criteria are justified by a micro-mechanics model and are used to predict crack curving and crack branching of dynamic photoelastic experiments involving Homalite-100 fracture specimens. The latter crack branching criterion requires as a necessary condition a critical dynamic stress intensity factor, Klb , which is accompanied by a sufficient condition involving the former crack curving criterion. This criteria is further verified by a dynamic finite element analysis of a bursting steel pipe of Congleton [26] and Almond, et al. [27], where the numerically computed branching stress intensity factor and branching angle are in good agreement with experimental results.

Copyright © 1982 by ASME
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