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doi: 10.1016/S0045-7825(99)00262-5

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==Abstract==

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In this work a generalized anisotropic elastoplastic constitutive model in

large deformation is presented. It is used for the analysis of

fiber-reinforced composite materials in the frame of the finite element

method. Mixing theory is applied to simulate the behavior of the

composite material.  The elastic anisotropic behavior  is simulated with classical elasticity theory, while

that of a non-proportional anisotropic solid is simulated by means of the

proposed generalized anisotropic elastoplastic model. The  approach assumes the existence of a real

anisotropic space and of a fictitious isotropic space where a mapped

fictitious problem is solved. Both spaces are related by means of a linear

transformation using a fourth order  tensor incorporating

complete information on the real anisotropic material. Details of

the numerical implementations of the model into a non-linear, large

deformations finite element solution scheme are provided. Examples of

application showing the performance of the model for the analysis of

fiber-reinforced composite materials are given.

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