Mechanics of finite cracks in dissimilar anisotropic elastic media considering interfacial elasticity

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• 作者：Pierre-Alexandre Juan ; Ré ; mi Dingreville ; ^{rdingre@sandia.gov}
• 关键词：Crack mechanics ; Stroh formalism ; Anisotropic bimaterial ; Interface properties ; Surface stress
• 刊名：Journal of the Mechanics and Physics of Solids
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：99
• 期：Complete
• 页码：1-18
• 全文大小：990 K
• 卷排序：99

文摘

Interfacial crack fields and singularities in bimaterial interfaces (i.e., grain boundaries or dissimilar materials interfaces) are considered through a general formulation for two-dimensional (2-D) anisotropic elasticity while accounting for the interfacial structure by means of an interfacial elasticity paradigm. The interfacial elasticity formulation introduces boundary conditions that are effectively equivalent to those for a weakly bounded interface. This formalism considers the 2-D crack-tip elastic fields using complex variable techniques. While the consideration of the interfacial elasticity does not affect the order of the singularity, it modifies the oscillatory effects associated with problems involving interface cracks. Constructive or destructive “interferences” are directly affected by the interface structure and its elastic response. This general formulation provides an insight on the physical significance and the obvious coupling between the interface structure and the associated mechanical fields in the vicinity of the crack tip.