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对碳纤维增强树脂基复合材料(CFRP)薄壁圆管的扭转屈曲、失效载荷和失效模式进行了试验和数值模拟。试验观察圆管在扭矩作用下的3种失效模式,分析了不同失效模式的特征和机理。考虑圆柱壳的初始缺陷和非线性屈曲等因素,利用ABAQUS建立了圆管屈曲和损伤的有限元模型。结果表明:屈曲诱发圆管表面微裂纹的产生和扩展,对圆管的失效有着加速作用;扭转失效过程中圆管层间应力较低,层间分层主要由管壁突然的破坏产生;圆柱壳的初始缺陷对屈曲和失效载荷的模拟影响较大,本文通过对比计算结果和试验数据确定了圆管的初始缺陷系数;损伤模型的数值模拟结果与试验数据相一致,验证了有限元模型的有效性。
Torsion buckling, failure load and failure modes of carbon fiber reinforced plastic matrix composites (CFRP) thin-wall tubes were tested and numerically simulated. Three kinds of failure modes of circular tube under torque were observed, and the characteristics and mechanism of different failure modes were analyzed. Considering the initial defects of cylindrical shell and nonlinear buckling, the finite element model of circular tube buckling and damage was established by ABAQUS. The results show that the generation and propagation of microcracks on the surface of circular tube caused by buckling accelerate the failure of the circular tube. The stress between the tube and the tube is low due to the sudden failure of the tube wall during the torsional failure. The initial defects of the shell have a great influence on the simulation of buckling and failure load. In this paper, the initial defect coefficient of the tube is determined by comparing the calculation results with the experimental data. The numerical simulation results of the damage model are in good agreement with the experimental data. Effectiveness.