International Journal for Multiscale Computational Engineering

ISSN for PRINT: 1543-1649

For Online Access

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2003, Volume1

Issue 1

134 pages

DOI: 10.1615/IntJMultCompEng.v1.i1

Issue price - $178.00

V. M. Harik
ICASE, MS 132C, NASA Langley Research Center, Hampton VA 23681-2199

This article investigates the influence of nanostructured fiber-matrix interphases on the global deformation response and local stress distributions in the composite micro-rods subjected to compressive loads. Finite element modeling of homogeneous and heterogeneous interphases is used to determine parameters that affect the composite response. Linear elastic and nonlinear elastic matrix material models are used in the simulations. Multiscale effects in transverse deformation of micro-rods are examined. The ratio of the matrix and interphase Young’s moduli is seen to a. ect the character of global deformation. A transition from barreling to bollarding type of deformation is seen as this ratio changes. This interphase-controlled change in the deformation mode constitutes a multiscale coupling between the micron-size interphase and the global response of a deforming rod. The radial, hoop, and shear stress distributions in the interphase region are also seen to be highly dependent on the type of interphase present and its submicron property gradients. A special case of theoretical predictions is compared with available data

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