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压缩行为是工程材料最为基本的力学性能之一.本文通过简化结构模型分析了各向同性的三维网状高孔率多孔材料在压缩载荷作用下的破坏模式,其中包括单向压缩、双向压缩和三向压缩等三种承载情形.在此基础上,得出了这种多孔体受压破坏源于剪切断裂模式时名义主应力与孔率之间的数理关系.结果表明,该类材料承受压缩载荷时的破坏模式与其材质的种类有关,脆性材质多孔体的孔棱呈拉断破坏模式,而韧性材质多孔体的孔棱则可能出现剪切断裂的破坏模式.对应得出的强度设计判据可为该类材料在这种承载破坏模式下的应用提供参考.
Compression behavior is one of the most basic mechanical properties of engineering materials.This paper analyzes the failure mode of isotropic three-dimensional porous mesoporous materials under compressive loading through simplified structural models, including unidirectional compression, bidirectional compression and Three-dimensional compression and so on.On this basis, the mathematical relationship between the nominal principal stress and porosity is obtained when the porous body is under compressive failure due to shear fracture mode.The results show that this type of material withstands The failure mode under compressive load is related to the type of material, the hole edge of the brittle material porous body is tensile failure mode, while the hole edge of the ductile porous material may appear the failure mode of shear fracture. It can provide a reference for the application of this kind of material in this mode of bearing failure.