FATIGUE CRACK PROPAGATION (FCP) BEHAVIOR OF GLASS-FILLED EPOXIES

摘要

The FCP behavior of glass-filled epoxy composites with three different types of reinforcements was characterized using linear elastic fracture mechanics and the toughening mechanisms were investigated. Special attention was paid to the role of matrix-particle adhesion on FCP behavior under dry and wet conditions. lunder dry as molded conditions, particle-matrix adhesion had very little influence on FCP behavior. In contrast, after moisture exposure FCP behavior was strongly influence by particle-matrix adhesion. Relatively poor adhesion showed the better FCP resistance after moisture exposure. Drying a moisture treated specimen resulted in the recovery of original FCP curve, suggesting that the moisture affected the specimen in a physical way, not in a chemical way accompanying chemical reaction or degradation.