考虑应力缓解效应的开孔复合材料层压板拉伸强度预测

doi:10.16183/j.cnki.jsjtu.2024.045

摘要/Abstract

摘要：

针对含开孔纤维增强复合材料层压板准静态拉伸强度预测以及渐进损伤分析问题,构建了一种渐进失效数值分析模型.模型聚焦劈裂造成的应力集中缓解效应,结合有限元分析软件Abaqus,在裂纹尖端引入了两列沿纤维方向分布的零厚度内聚力单元模拟劈裂,并沿纤维方向划分网格,有效降低了网格依赖性.应用该模型量化应力集中区的应力缓解效应,对各种开孔层压板的拉伸强度进行预测以及探究开孔层压板的渐进损伤过程,并与试验数据进行对比验证.结果表明,考虑应力集中区应力缓解效应的三维渐进损伤模型在计算开孔层压板应力集中系数上较其他有限元模型具有更好的精度,并且在强度预测和渐进损伤模拟方面具有合理的可靠性和准确性.

关键词: 复合材料层压板, 应力缓解效应, 渐进损伤, 有限元分析, 强度预测

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

中图分类号:

TB332

黄志迪, 高建雄, 孟令超, 程琴, 李苗苗. 考虑应力缓解效应的开孔复合材料层压板拉伸强度预测[J]. 上海交通大学学报, 2025, 59(12): 1929-1941.

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