Finite element model for simulating entropy-based strength-degradation of carbon-fiber-reinforced plastics subjected to cyclic loadings. (December 2022)

• Record Type: Journal Article
• Authors: Koyanagi, Jun; Mochizuki, Asa; Higuchi, Ryo; Tan, V.B.C.; Tay, T.E.
• Is Part Of: International journal of fatigue. Volume 165(2022)
• Publication Date: 2022-12
• Subjects: Finite element method -- Fiber-reinforced composite -- Fatigue -- Entropy -- Residual strength; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2022.107204
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: A novel model for simulating strength and fracture energy reductions based on the stress and strain histories of a carbon-fiber-reinforced plastic (CFRP) ply is developed, thus allowing us to comprehensively simulate the versatile failures including fatigue failure for CFRPs. The strength and fracture energy reductions are defined as functions of entropy generation. Strength and fracture energy reductions are introduced into the conventional Hashin's criterion. Through a simplified CFRP laminate model with frequency dependence, a delayed failure of 90° layer under cyclic displacement conditions is numerically simulated. Abstract: In this study, a novel model for simulating strength and fracture energy reductions based on the stress and strain histories of a carbon-fiber-reinforced plastic (CFRP) ply is developed, thus allowing us to comprehensively simulate the versatile failures including fatigue failure for CFRPs. The strength and fracture energy reductions are defined as functions of entropy generation. The entropy value is obtained from the absolute temperature and dissipated mechanical energy, such as the area of the inelastic hysteresis loop. Strength and fracture energy reductions are introduced into the conventional Hashin's criterion. An algorithm for this model and some numerical validations are presented herein. Through a simplified CFRP laminate model with frequency dependence, a delayed failure of 90°layer under cyclic displacement conditions is numerically simulated.