This paper focuses on structural collapse of fully clamped and simply supported hybrid sandwich beams of geometrically asymmetric carbon fiber-reinforced composite face sheets and an aluminum foam core under three-point bending. Both bending behavior and collapse mechanism have been explored and identified through the collapse mechanism map. Limit analyses have been conducted and these predictions are validated by experimental results. Experimental results show two active failure modes: face fracture and core shear. Effect of fully clamped boundary condition is to make bending deformation mechanism towards stretching of face sheets and core and strengthen the structural load-carrying capacity. Geometric parameters have significant influence on the initial failure load of hybrid sandwich beams under different boundary conditions. The initial failure modes were significantly affected by the mass distributions of face sheets with the same core thickness. The fully clamped sandwich beams with thick front face sheet have better fracture-resistance. For the similar failure modes, the load-carrying capacity of the simply supported sandwich beam with thick front face sheet is higher than that with thin front face sheet. The initial failure load of face fracture increases with increasing the front face sheet thickness and the initial failure load of core shear increases with increasing the core thickness.

本文着眼于在三点弯曲下完全夹紧并简单支撑的几何不对称碳纤维增强复合面板和铝泡沫芯的混合夹心梁的结构塌陷。弯曲行为和塌陷机制都已通过塌陷机制图进行了探索和识别。进行了极限分析，并通过实验结果验证了这些预测。实验结果显示了两种主动破坏模式：面破裂和岩心剪切。完全夹紧边界条件的作用是使弯曲变形机制朝向面板和型芯的拉伸，并增强结构的承载能力。在不同边界条件下，几何参数对混合夹层梁的初始破坏荷载具有重要影响。初始失效模式受具有相同芯厚度的面板的质量分布影响很大。完全夹紧的前面板厚的夹层梁具有更好的抗断裂性能。对于类似的破坏模式，前面板较厚的简支夹层梁的承载能力要比前面板较薄的简支夹层梁的承载能力更高。面板破裂的初始破坏载荷随着前面板厚度的增加而增加，岩心剪切的初始破坏载荷随着岩心厚度的增加而增加。前面板厚的简支夹层梁的承载能力要比前面板薄的简支夹层梁的承载能力高。面板破裂的初始破坏载荷随着前面板厚度的增加而增加，岩心剪切的初始破坏载荷随着岩心厚度的增加而增加。前面板厚的简支夹层梁的承载能力要比前面板薄的简支夹层梁的承载能力高。面板破裂的初始破坏载荷随着前面板厚度的增加而增加，岩心剪切的初始破坏载荷随着岩心厚度的增加而增加。