DYNAMIC MODELING FOR RATE-DEPENDENT INTERFACE FAILURE OF COMPOSITE MATERIALS

摘要

Textile composites exhibit multiple potential failure modes in structural or impact applications. Accurate modeling of these modes enables effective material design and structural design through multi-scale modeling and design from the micromechanical to application level. In dynamic impact events, interface failure between the fiber tow and interstitial matrix represents a common failure mode not explicitly captured in many models. This phenomenon is seen to be driven by rate-dependent interface fracture properties with both rate and fracture mode sensitivity. This paper focuses on development of a model for interface failure to be employed within a textile micromechanics model in later works. Simulation has enabled insight into the dynamic in-situ stress state and crack growth under impact for property determination and test specimen evaluation. A rate-dependent cohesive failure criterion has been successfully employed and agrees closely with published experimental results at multiple strain rates. Both rate and mode-mixity effects on failure have been successfully included.