Crack-tip dynamic isochromatics in the presence of small-scale yielding |
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Authors: | A A Betser A S Kobayashi O S Lee B S -J Kang |
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Institution: | 1. Department of Aeronautical Engineering, Technion, 3200, Haifa, Israel 2. Department of Mechanical Engineering, College of Engineering, University of Washington, 98195, Seattle, WA
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Abstract: | A plasticity correction factor for the dynamic stress-intensity factor,K I dyn , associated with a propagating crack tip in the presence of small-scale yielding, is derived from Kanninen's solution for a constant-velocity Yoffe crack with a Dugdale-strip yield zone. Distortions in the otherwise elastic isochromatics surrounding the constant-velocity crack tip are also studied by the use of this model. This plasticity correction factor is then used to evaluateK I dyn from the dynamic isochromatics of a propagating crack in a 3.2-mm-thick polycarbonate wedge-loaded rectangular double-cantilever-beam specimen. The correctedK I dyn is in good agreement with the corresponding values computed by a dynamic, elastic-plastic finite-element code executed in its generation mode. |
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