Abstract
In this study, fatigue performance of the multiple interfaces within sisal-fiber-reinforced composites (SFRCs) in the nanoscale was examined with nano-dynamic mechanical analysis technique. Cyclic loading with varying applied indentation loads at different frequencies was employed to study nanoscale interface failure. To correlate nanoscopic damage to macroscopic interfacial failure mechanisms, double-cantilever-beam (DCB) experiments were conducted to reveal the effects of hierarchical structure of sisal fibers on the interfacial failure behaviors of laminated SFRCs. Fiber bridging and fiber entanglement were observed during DCB test, which made the crack propagation path tortuous and introduced higher Mode I interlaminar fracture toughness compared with glass-fiber-reinforced composites. To model these actual multi-interfacial fracture behaviors, a numerical model subject to the DCB experiment was developed with designed cohesive-zone model in the pre-set crack front. Good consistency between numerical simulation and experimental results verified the efficiency of proposed model in simulating the multi-layer failure behaviors of laminated SFRCs.
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