An analysis of contact deformation of auxetic composites |
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Authors: | S V Shil’ko E M Petrokovets Yu M Pleskachevskii |
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Institution: | (1) Belyi Metal-Polymer Research Institute, Belarus National Academy of Sciences, Gomel’, Belarus |
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Abstract: | 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.
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Translated from Mekhanika Kompozitnykh Materialov, Vol. 42, No. 5, pp. 681–692, September–October, 2006. |
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Keywords: | adaptive mode contact deformation auxetic materials self-locking effect finite-element simulation anisotropy |
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