Thermomicromechanical damage in composites

A thermomicromechanical model of failure is presented based on thermodynami c principles, that is, using the balancing laws: the conservation of moment um and the first and second laws of thermodynamics. The model is oriented t oward damage initiation and damage progression in a composite structure und er an intense pressure shock wave, A micromechanical damage approach is con sidered where three damage modes are modeled tensile damage, shear damage, and interphase or material mismatch discontinuity between the composite's m atrix and fiber. A homogenization technique is incorporated in the developm ent to simplify the representation of the nonhomogeneous material. A summar y of the equations for the thermomicromechanical model of failure is presen ted where a damage parameter D is defined to characterize the lamina's dama ge based on energy dissipation. Numerical analyses are presented to demonst rate the model characterization to damage.