(1. 北京师范大学 核科学与技术学院，北京100875；2. 清华大学 核能与新能源技术研究院，北京100084)
摘 要: 以高孔率的三维网状多孔金属(即开口多孔金属)为研究对象，建立其简化结构失效模型。分析多孔构件在扭转和剪切载荷形式作用下由于孔棱发生拉断、剪切和屈曲而引起的失效模式，系统地研究上述两种承载条件下这类多孔体构件受到载荷作用而导致孔棱失效时名义载荷与孔率的数理关系。在此基础上，进一步研究此类材料在不同载荷作用下发生各种孔棱失效模式的载荷条件。结果表明，这些失效模式与多孔金属的材质指标、孔率及承受的载荷大小等因素均有关系，这种关系也可以进行相应的具体数理表征。
关键字: 多孔金属；泡沫金属；多孔材料
open-cell foamed metals under torsion and shearing
（1. College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China;
2. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China）
Abstract:The simplified structural models of failure were put forward for three-dimensional reticulated porous metals, i.e. open-cell porous metals, with high porosity. The failure modes were then analyzed for porous components under torsional and shearing loads, of which the destruction is caused by the tensile rupture, the shearing fracture and the yield of the pore strut of these porous metals. In addition, the mathematical relationships between the nominal loading and porosity were systemically studied for these failures of the pore strut of these components under loads resulting in the strut failure. On the basis of these works, the loading conditions of these porous materials were further studied for various strut failure modes from different loading. The results show that these failure modes are relative to the material indexes, porosity and loading magnitude, and these relationships can be correspondingly expressed by the specific mathematical equations.
Key words: foamed metal; porous metal; porous material
