Multiscale fatigue damage model for CFRP laminates considering the effect of progressive interface debonding

Abstract

This paper presents a multiscale progressive fatigue damage model to predict the fatigue life of composite laminates. The multi-level damage model was employed considering the interfacial debonding effect, and effective material properties were calculated through homogenization. Damage variables and damage slopes were defined at the constituent level, and fatigue damage parameters were obtained using the residual stiffness data with the chaotic firefly algorithm. The model was implemented into ABAQUS, then validated with flat-bar and pin-loaded specimens of AS4/3501-6 composite. The numerical results corresponded well with the experimental data and showed the ability to capture the failure propagation of composite laminates.

Keywords:

• Composites fatigue
• homogenization
• multiscale approach
• fatigue damage
• interface debonding

Additional information

Funding

The research was supported by Agency of Defense Development (20210211EAD-00) and the Institute of Engineering at Seoul National University. The authors are grateful for their support.