Micromechanical modeling of damage in uniaxially loaded unidirectional fiberreinforced composite laminae

Abstract A micromechanical composite model is used to study damage in a uniaxially loaded unidirectional fiber-reinforced composite thin lamina. The matrix and fiber materials are assumed to be elastic with the fibers aligned. An overall damage variable is introduced based on the concept of effective stress. The local damage effects are modeled through two additional separate damage variables which represent matrix and fiber damage. A local-overall relation for the damage variables is derived. Stress and strain concentration factors are derived for the damaged composite. Damage evolution is also considered using both local and overall analyses based on an extremum principle.

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