Damage Behavior of Aligned and Random Fiber Reinforced Composites for Automotive211 Applications

摘要

Damage constitutive models based on micromechanical formulation and combination211u001eof microchemical and macromechanical effects are presented to predict progressive 211u001edamage in aligned and random fiber reinforced composites. To estimate the overall 211u001eelastoplastic damage responses, an effective yield criterion is derived based on 211u001ethe ensemble-volume averaging process and the first-order effects of eigenstrains 211u001edue to the existence of discontinuous fibers. Progressive interfacial fiber 211u001edebonding models are subsequently considered in accordance with a statistical 211u001efunction to describe the varying probability of fiber debonding. First, an 211u001eeffective elastoplastic constitutive damage model for aligned fiber reinforced