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泡沫金属是一种具有广泛用途的工程材料。该文以高孔率网状泡沫金属为研究对象,建立了这种多孔材料的简化结构失效模型,研究了相应多孔构件在弯矩作用下的失效模式,这些失效模式包括孔棱的拉断、剪切和屈曲等。得出了这类多孔构件由于弯矩载荷作用而导致孔棱失效的系统的数理关系,包括孔棱失效时多孔构件所受名义弯矩与孔率的数理关系,以及对应于各种失效形式的条件表征。结果表明:当此类多孔构件承受弯矩载荷时,脆性材质多孔体的孔棱多发生拉断破坏,韧性材质多孔体的孔棱则可能发生剪切断裂。
Foam metal is a widely used engineering material. In this paper, a high-porosity reticulated metallic foam is taken as the research object. A simplified structural failure model of the porous material is established. The failure modes of the corresponding porous members under bending moment are studied. Shear and buckling. The mathematical relationship between the failure of the hole edge and the nominal bending moment of the porous member during the failure of the hole edge is obtained, and the mathematical relationship between the nominal bending moment and the porosity of the porous member is given. Condition characterization. The results show that when the porous members are subjected to moment loading, the foraminous edges of the brittle porous material often pull off and break, and the edge of the ductile porous material may shear and fracture.