A creep damage model is presented that allows for anisotropic distributions of damage in composite materials. An earlier model by the writers allowed for anisotropic damage growth rate but, based on a scalar state variable, failed to account for anisotropic distributions of damage. A vectorial state variable is introduced that allows a representation of anisotropic damage distribution. As in earlier work, a fundamental assumption is that the principally damaging stress components are tensile traction and longitudinal shear at the fiber/matrix interface. Application of the creep damage model is made to calculations involving homogenously stressed composite elements under transverse tensile and longitudinal shear stress and to cross plied thin-walled tubes under tension/torsion. Although the emphasis is phenomenological, with focus on a mathematical structure for representing anisotropic distributions of damage, a meaningful creep damage model must rest on fundamental material science and microstructural examination. Verification experiments involving tension/torsion testing of thin-walled composite tubes together with detailed microstructural examination are discussed and outlined.
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A Representation of Anisotropic Creep Damage in Fiber Reinforced Composites
D. N. Robinson,
Robinson, D. N., and Binienda, W. K. (October 28, 2004). "A Representation of Anisotropic Creep Damage in Fiber Reinforced Composites." ASME. J. Appl. Mech. July 2005; 72(4): 484–492. https://doi.org/10.1115/1.1875512
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