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RESEARCH PAPERS

On the Extent of Dominance of Asymptotic Elastodynamic Crack-Tip Fields: Part II—Numerical Investigation of Three-Dimensional and Transient Effects

[+] Author and Article Information
Sridhav Krishnaswamy, Ares J. Rosakis

Graduate Aeronautical Laboratories, California Institute of Technology, Pasadena, CA 91125

G. Ravichandran

University of California, San Diego, CA

J. Appl. Mech 58(1), 95-103 (Mar 01, 1991) (9 pages) doi:10.1115/1.2897185 History: Received March 31, 1989; Revised March 14, 1990; Online March 31, 2008

Abstract

In Part I of this paper, the question of the extent of dominance of the mode I asymptotic elastodynamic crack-tip field (the K d I -field) was studied experimentally. Here, the results of two and three-dimensional elastodynamic finite element simulations of the drop-weight experiments are reported. The load records as obtained from the impact hammer and supports of the drop-weight loading device were used as boundary tractions in the numerical simulations. For the laboratory specimen studied, the results of the simulations indicate that the asymptotic elastodynamic field is not an adequate description of the actual fields prevailing over any sizeable region around the crack tip. This confirms the experimental results of Part I which showed that three-dimensional and transient effects necessarily have to be taken into account for valid interpretation of experimental results.

Copyright © 1991 by The American Society of Mechanical Engineers
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