多孔材料在压缩载荷作用下的屈曲失效模式分析

压缩是工程材料最基本的承载方式之一,多孔材料中的孔棱受到压缩载荷时可能产生屈曲行为.建立了各向同性三维网状高孔率多孔材料的简化结构失效模型,分析了这种材料在不同压缩载荷作用下由于孔棱发生屈曲而引起的失效模式,系统地得出了单向压缩、双向压缩和三向压缩等三种承载形式下这种多孔体受压而导致孔棱屈曲时名义主应力与孔率的数理关系.在此基础上,进一步得出了此类材料在压缩载荷作用下发生孔棱屈曲的载荷条件.

Analyses of buckling failure mode for porous materials under compression

The compressive behavior is one of most basic mechanical properties for engineering materials, and the struts of porous materials under compression may display the buckling phenomena when the porous bodies are under compressive loadings. In the present paper, a failure model of simplified structures is established for isotropic three-dimensional reticulated porous materials, and the failure modes resulting from the strut bucklings are analyzed for these materials under compressive loadings. The mathematical relationships between nominal main stresses and porosities are systemically derived for this buckling failures of these materials under uniaxial compression, biaxial compression and triaxial compression. Based on these results, the relevant loading conditions resulting in the strut buckling are further obtained for these materials under compressive loadings.