Prediction of Tensile Strength of Open-Cell Composite Laminates Considering Stress Relief Effects

doi:10.16183/j.cnki.jsjtu.2024.045

Abstract

Abstract:

A numerical analysis model for progressive failure was constructed to address the prediction of quasi-static tensile strength and progressive damage analysis of fiber-reinforced composite laminates with open holes. The model focuses on the stress concentration relief effect caused by splitting, combines with the finite element analysis software Abaqus, introduces two columns of zero-thickness cohesive cells at the crack tip along the fibre direction to simulate splitting, and divides the mesh along the fibre direction, which effectively reduces the mesh dependency. This model is applied to quantify the stress-relief effect in the stress concentration area, predict the tensile strength of various open-cell laminates, and explore their progressive damage process. The model predictions are validated in comparison with experimental data. The results show that the progressive damage model considering the stress-relief effect in the stress concentration zone achieves higher accuracy than other finite element models in calculating the stress concentration factor of open-cell laminates, and has reasonable reliability and accuracy in strength prediction and progressive damage simulation.

Key words: composite laminates, stress-relief effect, progressive damage, finite element analysis, strength prediction

CLC Number:

TB332

HUANG Zhidi, GAO Jianxiong, MENG Lingchao, CHENG Qin, LI Miaomiao. Prediction of Tensile Strength of Open-Cell Composite Laminates Considering Stress Relief Effects[J]. Journal of Shanghai Jiao Tong University, 2025, 59(12): 1929-1941.

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性能参数	取值
E₁/GPa	22.54
E₂/GPa	10.94
G₁₂/GPa	3.54
ν₁₂	0.3
X_T/ MPa	578
X_C/ MPa	300
Y_T/MPa	38
Y_C/MPa	50
S_L/MPa	82
S_T/MPa	82
${G}_{f}^{T}$/(N·mm^-1)	12.5
${G}_{f}^{C}$/(N·mm^-1)	12.5
${G}_{m}^{T}$/(N·mm^-1)	1
${G}_{m}^{C}$/(N·mm^-1)	1

内聚层参数	取值
${t}_{n}^{0}$=${t}_{s}^{0}$=${t}_{t}^{0}$/MPa	50
G_n=G_s=G_t/(N·mm^-1)	4
η	2

纤维角/(°)	对比拉伸强度^[25] /MPa	预测拉伸强度/MPa
0	365.28	372.35
45	48.34	55.81
45	30.64	35.76

铺层顺序	对比拉伸强度^[25] /MPa	预测拉伸强度/MPa
[0/90/90/0]_S	176.71	182.24
[0/45/-45/90]_S	158.61	163.85
[(45)₄/(-45)₄]	82.62	87.39