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Crack-opening displacements and normal strains in centrally notched plates |
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| Authors: | A S Kobayashi W L Engstrom B R Simon |
| Institution: | 1. Department of Mechanical Engineering, University of Washington, Seattle, Wash. 2. Commercial Airplane Div., The Boeing Co., Renton, Wash. 3. Department of Mechanical Engineering, University of Washington, USA |
| Abstract: | Experimentally determined crack-opening displacements of stationary and running cracks and of inclined stationary cracks in centrally notched plates are reported in this paper. The moiré-fringe technique was used for the determination of displacement fields in test specimens of magnesium, 7075-T6 and 7178-T6 aluminum alloys. Experimentally determined crack-opening displacements were compared with corresponding re ults based on theoretical models of Westergaard, Dugdale, Craggs and Craggs-Dugdale. In addition, normal-strain fields derived from the moiré-fringe data were compared with static or dynamic strain fields of these theoretical models. The results of this investigation indicate that while the Dugdale crack is a fair model of a stationary crack in ductile materials, the Craggs crack appears to be a better representation of a running crack in the ductile materials investigated. |
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