Numerical simulation and experimental research on fracture toughness of T300/69 laminated considering 90° sub-layup

Abstract

Abstract: A modified fracture toughness calculation method is proposed in this research to address the shortcoming that the existing fracture toughness calculation model for composite laminates ignores the effects of 90° sub-layers and fiber debonding on fracture toughness. First, in the study of fracture toughness of orthotropic anisotropic fiber-reinforced composites, an extended finite element method is used to simulate the crack expansion process of T300/69 fiber-reinforced composite laminate with the help of ABAQUS finite element software to analyze the effect of 90° sub-layers on the overall fracture toughness of the laminate. Next, the fracture toughness model considering the effect of fiber debonding combined with energy release rate was established considering the effect of 90° sub-layers. Finally, the fracture toughness of T300/69 composite laminate under different paving methods is studied by compact tensile experiments using displacement-load data to verify the accuracy of the model. The results show that the fracture toughness obtained from the model proposed in this paper exhibits minimal disparities from the experimental results, thereby rending it more representative of the real-world applications. The proposed model holds significant practical implications for practical engineering.

Key words: energy release rate, fracture toughness, 90° sub-layup, fiber debonding

CLC Number:

TH114
O346.2

WEI Yao-bing, WANG Xue-xue, JIN Yi-fan, LIU Jian-hui, LANG Shan-shan. Numerical simulation and experimental research on fracture toughness of T300/69 laminated considering 90° sub-layup[J]. Journal of Lanzhou University of Technology, 2023, 49(6): 33-40.

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