Balsa芯材夹层梁的失效分析  

FAILURE ANALYSIS OF SANDWICH BEAMS WITH BALSA CORE

作　　者：万里[1] 刘伟庆[1] 周叮[1] 方海[1] 

机构地区：[1]南京工业大学先进工程复合材料研究中心,南京211816

出　　处：《工程力学》2011年第2期134-140,共7页Engineering Mechanics

基　　金：江苏省属高校自然科学重大基础研究项目(06KJA56002)

摘　　要：通过三点弯曲试验,分析了Balsa木芯材夹层梁的破坏模式。夹层梁发生了芯材剪切、面板拉伸/受压破坏、屈曲破坏。由测试结果发现,Balsa木夹层梁的承载力远低于理论计算,且破坏模式也与一般情况有差别。采用有限元方法,考虑了夹层结构的初始缺陷和材料的各向异性,建立了一系列有限元分析模型,对夹层梁的承载失效问题进行了分析计算。计算结果采用神经网络算法进行拟合,分析了初始脱层和芯材缝隙裂纹对夹层梁承载能力的影响,为Balsa轻木夹层结构的制备、分析和设计提供参考。The failure modes of sandwich beams with Balsa core are analyzed.The sandwich beams fail in several modes including the core shearing,the tensile/compressive failure of face sheet and the face sheet bulking.The tests demonstrate that the capacity of sandwich beams with Balsa core is greatly lower than that predicted theoretically and the failure modes are different from those of the common sandwich beams.The finite element analysis is performed considering the imperfection of the composite structure.Several FE models including the anisotropy and the initial imperfection are built up.The curve fittings of the numerical results are performed by means of the neutral network technique.The influence of the initial interfacial delaminations and the core cracks are investigated.

关 键 词：Balsa轻木 各向异性 破坏模式 初始缺陷 有限元 

分 类 号：TB33[一般工业技术—材料科学与工程] TB301