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为研究面芯脱粘缺陷对复合材料夹层结构屈曲特性的影响,对含贯穿矩形面芯脱粘缺陷的复合材料夹芯梁进行了试验和仿真研究.轴向压缩试验发现:试件破坏模式为混合屈曲失效,承载过程可划分为轴向压缩、局部屈曲、混合屈曲和坍塌失效四个阶段.在试验基础上,基于Abaqus非线性弧长算法,对复合材料夹芯梁的极限载荷及后屈曲路径进行模拟.采用三维内聚力单元模拟预制脱粘缺陷,从破坏模式和极限载荷两个方面与试验结果进行对比,误差为6.51%,验证了数值计算方法的可靠性.有限元分析发现:随芯层模量增加,极限荷载先非线性增长后线性增长;当缺陷因子为0.052时,极限荷载为完整结构的80%,为确保结构的承载特性,应在缺陷因子达到0.05前及时进行脱粘区域修补.
In order to study the influence of debonding of core and core on the buckling characteristics of composite sandwich structure, the experiment and simulation research on the composite sandwich core with penetration failure of rectangular core was carried out. The axial compression test showed that the failure mode was Mixed buckling failure, bearing process can be divided into four stages of axial compression, local buckling, mixed buckling and collapse failure.Based on the experiment, based on Abaqus nonlinear arc length algorithm, the ultimate load and post-buckling of composite sandwich beam The simulation results show that the three-dimensional cohesion unit can be used to simulate prefabricated debonding defects, and the error is 6.51% from the failure mode and the ultimate load, which verifies the reliability of the numerical method.Finally, When the defect factor is 0.052, the ultimate load is 80% of the complete structure. To ensure the bearing characteristics of the structure, the debonding zone should be timely carried out before the defect factor reaches 0.05 repair.