Numerical simulation of longitudinal debonding behavior in unidirectional fibre-reinforced composites considering hygrothermal treatment

doi:10.19936/j.cnki.2096-8000.20250228.007

Abstract

Abstract: The longitudinal debonding behavior around the broken fiber tip before and after hygrothermal treatment were studied by ABAQUS calculation software. The interface constitutive model of fiber and matrix is simulated by coupling the bilinear traction-separation law with Coulomb sliding friction law. The results show that the plastic properties and strain softening effect of resin also have a great influence on the interfacial debonding behavior. Generally, the better the strain softening effect of resin is, the more difficult the interface debonding; hygrothermal treatment degrades the interface performance, leads to lower stress transfer capacity, accelerates the interface stripping and produces a longer debonding zone. Hygrothermal treatment reduces the maximum SCF on adjacent fibers, confirming that poor interfaces are inefficient in stress transfer. High SCF in dry state often leads to the fracture of adjacent fibers more easily, resulting in rapid expansion of fiber fracture. This study provides assistance for a better understanding of the effect of mechanical properties on the behavior of interfaces and the effect of hygrothermal treatment on the longitudinal tensile failure of unidirectional composites.

Key words: the fiber/matrix interface, micromechanics, hygrothermal treatment, debonding behavior, stress concentration factors, finite element analysis (FEA), composites

CLC Number:

TB332

YI Wenzhao, LIU Lulu, XU Kailong, CHEN Wei. Numerical simulation of longitudinal debonding behavior in unidirectional fibre-reinforced composites considering hygrothermal treatment[J]. COMPOSITES SCIENCE AND ENGINEERING, 2025, 0(2): 46-53.

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