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Vol.14, No.3, 2014, pp.161–165 |
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DYNAMIC CRACK GROWTH ALONG THE ELASTIC-PLASTIC BIMATERIAL INTERFACE Jelena M. Djoković1, Ružica R. Nikolić2,3, Dejan D. Ilić4, Jozef Vičan3 1)University of Belgrade, Technical Faculty of Bor, jelenamdjokovic@gmail.com 2)University of Kragujevac, Faculty of Engineering 3)University of Žilina, Faculty of Civil Engineering 4)Pupin Telecom Company, Belgrade |
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Abstract The paper considers the behaviour of the stress field that surrounds the tip of a crack that propagates dynamically along the interface between two elastic-plastic materials. Behaviour of elastic-plastic materials is described by the J2 - deformation theory. Analysis shows that the stress field at the crack tip is mainly defined by the material characteristics and the crack propagating speed. The field in the vicinity of the crack tip is more influenced by the material with the smaller coefficient of deformation hardening. It is also noticed that the crack propagating speed affects only the stress field in the Mode I conditions, while the stress field in Mode II conditions is insensitive to the variation of the crack tip speed. With increase of the crack tip speed values of stresses in the Mode I conditions are decreasing, so the normal stresses at the crack tip have values significantly smaller than the von-Mises stress. This points to the fact that the interfacial crack in Mode I conditions possesses substantially larger toughness than in equilibrium growth conditions. Keywords: interface, crack, dynamic growth, elastic-plastic material |
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full article (1650 kB)
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