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。 Through the three-point bending test, the failure mode of Balsa wood core sandwich beam was analyzed. The sandwich beam core material shear, panel tensile / compression damage, buckling damage. The test results show that the bearing capacity of Balsa wood sandwich beam is much lower than the theoretical calculation, and the failure mode is also different from the general situation. The finite element method was used to consider the initial defects of the sandwich structure and the anisotropy of the material. A series of finite element analysis models were established to analyze the bearing failure of the sandwich beam. The calculation results were fitted by neural network algorithm. The influence of initial delamination and crevice crack on the bearing capacity of the sandwich beam was analyzed, which provided a reference for the preparation, analysis and design of Balsa bark sandwich structure.