Off-Axis Tensile Test and Numerical Simulation of Unidirectional Thermoplastic Composite Laminates

doi:10.16183/j.cnki.jsjtu.2021.352

Abstract

Abstract:

As a high-performance thermoplastic composite material, AS4/PEEK has been widely used in aerospace, military, automotive, and other fields. After conducting the off-axial tensile test of unidirectional AS4/PEEK laminates with different angles, the relevant stress-strain curves and tensile strengths, as well as fracture plane angles are obtained. In simulation, a 3D elastic-plastic model where the parameters are determined by trust-region reflective algorithm is used to describe the nonlinear mechanical behavior of AS4/PEEK laminates. In combination with the LaRC05 criterion and the crack zone theory, a user material subroutine VUMAT based on Abaqus is developed and applied to the numerical simulation of off-axis tensile test. The numerical results show that the 3D elastic-plastic damage constitutive model can accurately simulate the plastic effect of AS4/PEEK laminates and the tensile strength predicted by the numerical method agrees well with those from the test. The proposed 3D elastic-plastic damage model provides an accurate and effective method for the comprehensive analysis of plastic deformation and damage of thermoplastic composites.

Key words: AS4/PEEK, off-axial tension, plastic model, LaRC05, crack band theory

CLC Number:

TB332

ZHANG Jian, CHEN Xiuhua, CHEN Yong, FANG Yin. Off-Axis Tensile Test and Numerical Simulation of Unidirectional Thermoplastic Composite Laminates[J]. Journal of Shanghai Jiao Tong University, 2023, 57(2): 201-212.

Figures/Tables 15

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铺层	破坏模式	破坏部位	断裂面角度/(°)
[0]₈	纵向劈裂	工作段中部	-
[15]₂₀	倒角	工作段中部	15.95
[30]₂₀	倒角	工作段顶部	30.76
[45]₂₀	倒角	工作段顶部和加强段内	46.68
[60]₂₀	倒角	工作段中部	59.38
[80]₂₀	倒角	工作段中部	79.59
[90]₁₆	横向破坏	工作段中部	90.91

铺层	实验值/MPa	预测值/MPa	误差/%
[0]₈	896.35	966.21	7.79
[15]₂₀	298.41	271.04	-9.17
[30]₂₀	138.78	158.85	14.46
[45]₂₀	120.50	137.99	14.51
[60]₂₀	114.37	106.28	-7.07
[80]₂₀	76.96	91.62	19.05
[90]₁₆	97.13	101.04	4.03