摘要
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 research the effect of face/core debond on buckling behaviors of composite sandwich beam,an experimental and numerical study of the in-plane compressive failure mechanism of sandwich beam with an implanted through-width rectangle face/core debond was presented.The response of the specimens show that main failure mode was mixed buckling,and the load bearing process could be divided into axial compression,local buckling,mixed buckling and collapse failure stages.Based on the experimental results,a finite element model was established to simulate the capability of load bearing and post-buckling behaviors of composite sandwich beams by the nonlinear RIKS algorithm.The implanted through-width rectangle face/core debond was simulated by cohesive elements.Comparisons of experimental and numerical ultimate loads assoicated with failure modes showed a good agreement.The error was 6.51% which proved the model was accurate.The error was6.51%,which proved the reliability of the model.The study results show that with the increase of core modulus,firstly the ultimate load is nonlinear increased,and then increased linearly.If the defect factor is 0.052,the load factor is 80%.In order to guarantee the load-bearing capacity,the structure should be repaired timely before the defect factor is 0.05.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第7期40-45,共6页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家部委基金资助项目(9140A14080914JB11044)
关键词
复合材料
夹芯梁
面芯脱粘缺陷
屈曲
极限荷载
composite material
sandwich beam
face/core debond
buckling
ultimate load
