Analysis of mechanical properties and failure mechanism of variable stiffness composite laminates

doi:10.19936/j.cnki.2096-8000.20220728.001

Abstract

Abstract: In the process of using the wing skin, the issues of insufficient bearing capacity, rigidity and stability are likely to occur. To solve these problems, the variable rigidity laminate is introduced and its mechanical properties and failure mechanism are studied. Firstly, it is proposed to use the periodic triangular wave as the fiber angle change function to optimize the fiber direction and reference path. Secondly, the mechanical model of the variable stiffness laminate is established and the representative volume element is used to predict and analyze the mechanical properties of the model. Then, based on the idea of piecewise linearization, the three-dimensional variable stiffness laminate finite element model is constructed through the MATLAB/ABAQUS. Finally, based on the Tsai-Wu tensor theory, the damage evolution, mechanical properties and failure mechanism of traditional laminates and optimized variable stiffness laminates under tension and compression conditions are analyzed. It indicates that when the reasonable fiber placement path is used for laminates, the failure of laminates caused by large local deformations can be effectively suppressed, the stress distribution of the variable stiffness laminate is more uniform, and the bearing capacity, rigidity and stability of the wing skin are improved.

Key words: composite, laminate, variable stiffness, mechanical properties, failure mechanism

CLC Number:

TB332

LI Hui, ZHAO Chun-jiang, LIANG Jian-guo, ZENG Guang, WANG Rui, BIAN Qiang. Analysis of mechanical properties and failure mechanism of variable stiffness composite laminates[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(7): 5-10.

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