泡沫铝填充金属波纹夹芯梁弯曲破坏模式研究

Failure mode of aluminum foam-filled corrugated sandwich beam under three-point bending load

摘要:

为了提高金属波纹结构的承载效率，充分发挥泡沫铝在能量吸收方面的优势，本文设计了泡沫铝填充金属波纹三明治夹芯梁。针对波纹结构各向异性的特点，本文对其横向和纵向两个方向在三点弯曲载荷作用下的力学响应及破坏模式进行了试验研究。研究表明，泡沫铝的填充可以有效改变金属波纹夹芯梁的弯曲破坏模式，其弯曲刚度和峰值载荷均得到了大幅提升。和横向弯曲相比，金属波纹夹芯梁在纵向弯曲时具有更强的承载能力，且泡沫铝填充的增强效果更加显著。纵向弯曲时载荷在达到峰值后并不会突然下降而是呈现出很长的平台区，表现出更强的后屈曲承载能力。

Abstract:

Aluminum foam is used as filling material to improve the load bearing efficiency of metallic sandwich beam with corrugated cores. After filling of aluminum foam prims into the space of corrugated cores which were cut firstly and gluing process, aluminum foam-filled corrugated sandwich beam is formed. Considering the anisotropy of the corrugated structure, both transverse and longitudinal bending response and failure modes are studied by three-point bending loads experimentally. The result shows that aluminum foam filling can effectively change the bending failure mode of corrugated sandwich beam, and lead to a significant increase of bending stiffness and peak bending load. Compared with transverse bending, the enhancement effect of aluminum foam filling on longitudinal bending is more significant. The bending loads presents a long plateau region and with no notable decline after its peak, showing a stronger post-buckling bearing capacity.