Rate Dependence of Interlaminar Fracture Toughness in Carbon-Fiber/Epoxy Composite Laminates under Mixed Mode Loading

摘要

Mixed mode interlaminar fracture behavior of several types of carbon-fiber/epoxy composites was investigated to clarify the effects of strain rate and mode ratio. The modeⅠ, mode Ⅱ and their mixed mode fracture toughness showed strain rate dependence regardless of mode ratio. The mixed mode fracture toughness conformed to the linear fracture criterion at lower loading rate. However, it did not conform to the linear criterion at higher loading rate.