Abstract
In this study, macro/meso/micro inelastic analysis method for plain-woven laminates is developed based on a homogenization theory for nonlinear time-dependent composites. For this, a three-scale modeling of plain-woven laminates is performed by considering a plain-woven laminate as a macrostructure, fiber bundles (yarns) and a matrix in the laminate as a mesostructure, and fibers and a matrix in the yarns as a microstructure. Then, a macroscopic constitutive equation of the laminate is derived by dually applying the homogenization theory for nonlinear time-dependent composites to not only the meso/micro scale but also the macro/meso scale. Using the present analysis method, the elastic-viscoplastic analysis of a plain-woven glass fiber/epoxy laminate subjected to on and off-axis loading is performed. Moreover, the analysis results are compared with the experimental data. It is shown that the present analysis method successfully takes into account the effects of inelastic properties of the epoxy not only around the fiber bundles but also inside of the fiber bundles. It is also shown that the results of analysis are in good agreement with experimental data.
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