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Durability Analysis of CFRP Adhesive Joints: A Study Based on Entropy Damage Modeling Using FEM
Summary
Researchers incorporated an entropy damage model into the finite element method to predict the fatigue durability of carbon fiber-reinforced plastic (CFRP) adhesive joints with varying adhesive layer thicknesses. Findings showed that damage variables peaked at a 0.3 mm adhesive thickness before declining, providing insight into stress behavior at the resin-composite interface under cyclic loading.
Experimental methodologies for fatigue lifetime prediction are time-intensive and susceptible to environmental variables. Although the cohesive zone model is popular for predicting adhesive fatigue lifetime, entropy-based methods have also displayed potential. This study aims to (1) provide an understanding of the durability characteristics of carbon fiber-reinforced plastic (CFRP) adhesive joints by incorporating an entropy damage model within the context of the finite element method and (2) examine the effects of different adhesive layer thicknesses on single-lap shear models. As the thickness of the adhesive layer increases, damage variables initially increase and then decrease. These peak at 0.3 mm. This observation provides a crucial understanding of the stress behavior at the resin-CFRP interface and the fatigue mechanisms of the resin.
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