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Damage Evolution Modeling in Orthotropic Laminated Composites
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| Proceedings of the 33rd AIAA/ASME/ASCE/AHS/AHC Structures, Structural Dynamics and Material Conference, April 13-15, 1992, Dallas, pt 5 |
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Composites have inherent scatter in elastic and strength properties. A probabilistic model utilizing random material characteristics to predict damage evolution in orthotropic laminated composites is presented in this paper. The proposed model is based on a division of a laminated composite into a statistically large number of meso-elements (mesovolumes). The mesovolume is assumed to be large enough to be structurally homogeneous and at the same time it has to be comparatively small in order to satisfy the condition of stochastic homogeneity of stress and strain fields. Three modes of mesovolume failure, i.e., fiber breakage and matrix failure in transverse direction as well as matrix shear cracking, are taken into account. Damage formation in a ply and in a laminate as a whole for a given plain stress-strain state are calculated from the probabilities of mesovolumes failures. These probabilities are directly utilized in reducing ply material constants. A numerical algorithm for damage accumulation and deformation history predictions for orthotropic laminated composites is developed. Behavior of a laminated orthotropic composite is presented as an illustrative example. Analysis of angle-ply Kevlar/epoxy laminates subjected to tension, compression and shear loading is performed. The effect of scatters in elastic and strength characteristic on damage evolution is shown.
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