多孔材料在压缩载荷作用下的剪切破坏模式分析

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.

Analysis of shearing failure mode for porous materials under compression

The compressive behavior is one of the most basic mechanical properties of engineering materials. With the simplified structural model, the compressive failure mode is analyzed for isotropic three-dimensional reticulated porous materials, and the mathematical relationships between nominal main stress and porosity are obtained for these materials at shearing failure under uniaxial compression, biaxial compression and triaxial compression, respectively. The results show that, the porous body of brittle material species shows the tensile fracture mode of pore struts, and the porous body of ductile material species may display the shearing fracture mode of pore struts. The correspondingly obtained criteria of strength design can be referred to in applications of these materials under respective loading failure modes.