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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.
Compression is one of the most basic bearing ways of engineering materials, and the buckling behavior may occur when the hole edges of porous materials are subjected to compressive load. A simplified structural failure model of isotropic three-dimensional porous mesoporous materials with high porosity is established. Under the different compressive loads, the failure mode caused by the buckling of the hole edge is systematically obtained. Under the three kinds of bearing forms, such as uniaxial compression, two-way compression and three-way compression, The relationship between the nominal principal stress and the porosity is obtained.On the basis of this, the loading conditions of the hole buckling under such compressive load are obtained.