Estimation of the η Factors for Mixed-Mode Cracks in Compact Tension Specimens

[+] Author and Article Information
Y. Wang, J. Pan

Mechanical Engineering and Applied Mechanics, The University of Michigan, 2250 G. G. Brown, 2350 Hayward, Ann Arbor, MI 48109-2125

J. Pressure Vessel Technol 121(2), 203-208 (May 01, 1999) (6 pages) doi:10.1115/1.2883687 History: Received May 27, 1998; Revised October 14, 1998; Online February 11, 2008


The η factors for mixed-mode cracks in compact tension specimens are investigated for estimation of the J -resistance curve under mixed-mode loading conditions. The derivation of the η factor is first generalized for mixed-mode cracks. Based on a lower-bound approach for rigid-perfectly plastic materials, the η factors are then derived under mixed-mode I and III and mixed-mode I and II loading conditions. The results indicate that the η factor is only a function of the normalized crack length under mixed-mode I and III loading conditions. However, under mixed-mode I and II loading conditions, the η factor is not only a function of the normalized crack length, but also influenced by the fixture design due to the moment induced by the mode II load.

Copyright © 1999 by The American Society of Mechanical Engineers
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