Time-domain BEM analysis of a rapidly growing crack in a bi-material |
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Authors: | Jun Lei Yue-Sheng Wang Dietmar Gross |
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Affiliation: | (1) Institute of Engineering Mechanics, Northern Jiaotong University, Beijing, 100044, P.R. China;(2) Institute of Mechanics, TU Darmstadt, Hochschulstrasse 1, D-64289 Darmstadt, Germany |
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Abstract: | Rapid propagation of a matrix crack in a bi-material system is studied with emphasis on the dynamic interaction between the crack and the interface by combining the traditional time-domain displacement boundary element method (BEM) and the non-hypersingular traction BEM. The crack growth is controlled by the fracture criterion based on the maximum circumferential stress, and is modeled by adding new elements to the moving crack tip. Detailed computation is performed for an unbounded bi-material with a crack subjected to incident impact waves and a bounded rectangular bi-material plate under dynamic wedged loading. Numerical results of the crack growth path, speed, dynamic stress intensity factors (DSIFs) and dynamic interface tractions are presented for various material combinations and geometries. The effects of the interface on the crack growth are discussed. |
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Keywords: | Bi-material boundary element method crack propagation dynamic fracture interface |
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