An analysis of contact deformation of auxetic composites
An analysis of contact deformation of auxetic composites
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DOI：
10.1007/s11029-006-0058-8
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发表时间：
2006-09
影响因子：
1.7
通讯作者：
S. Shil’ko;E. M. Petrokovets;Yu. M. Pleskachevskii
中科院分区：
文献类型：
--
作者：
S. Shil’ko;E. M. Petrokovets;Yu. M. Pleskachevskii
研究了负泊松比各向同性和各向异性拉胀材料接触变形时摩擦相互作用的自锁效应。这种效应表现在接头的承载能力随着剪切载荷的增加而增加。特别地，应力状态的参数（接触载荷、切向应力、滑移等）在有或没有剪切的压缩条件下，确定了双搭接接头。采用有限元法对三种对称接触单元（平面、圆柱和楔形）的接触相互作用进行了分析。泊松比在各向同性弹性介质理论允许的范围内变化。类似的计算也进行了一个节点的变形单元的各向异性拉胀复合材料，其加强角是不同的。最大载荷，切向应力，和滑移作为泊松比（在各向同性的情况下）和复合材料的增强角的非线性函数。对应力集中和极限剪力的增加也进行了估算。
The adaptive mode of frictional interaction has been studied as a self-locking effect upon contact deformation of isotropic and anisotropic auxetic materials with a negative Poisson ratio. This effect manifests itself in the fact that the bearing capacity of the joint rises with increasing shear load. In particular, the parameters of stress state (contact load, tangential stresses, slippage, etc.) were determined for a double-lap joint under conditions of compression with or with out shear. The contact interaction was analyzed by the finite-element method for three profiles of symmetrically located contact elements (plane, cylindrical, and wedge-shaped). The Poisson ratio was varied within the range theoretically admissible for isotropic elastic media. Analogous calculations were also performed for a joint with a deformed element made of an anisotropic auxetic composite, whose reinforcement angle was varied. The maximum loads, tangential stresses, and slippage are obtained as nonlinear functions of Poisson ratio (in the isotropic case) and reinforcement angle of the composite material. The stress concentration and the increased ultimate shear forces are also estimated.