Concepts for bridged Mode II de1amination cracks

摘要

Limiting cases and length scales are detailed for Mode Il delamination cracks bridged by through-thickness reinforcement. Analytical results are found for two limits: a steady--state configuration indicative of noncatastrophic failure. and a small-scale bridging configuration indicative of catastrophic failure. General large-scale bridging conditions are studied numeri- cally using bending theory for anisotropic plates. The effects of the mechanical properties of the laminate and the reinforcement, notch length, and plate thickness on the transition between the two lin1iting configurations, notch sensitivity and mechanical behavior are analyzed. All of these effects can be expressed succinctly in terms of a few length scales which are material- structure parameters involving the plate thickness.