(1. 北京師范大學(xué) 核科學(xué)與技術(shù)學(xué)院，北京100875；2. 清華大學(xué) 核能與新能源技術(shù)研究院，北京100084)
摘 要: 以高孔率的三維網(wǎng)狀多孔金屬(即開口多孔金屬)為研究對象，建立其簡化結(jié)構(gòu)失效模型。分析多孔構(gòu)件在扭轉(zhuǎn)和剪切載荷形式作用下由于孔棱發(fā)生拉斷、剪切和屈曲而引起的失效模式，系統(tǒng)地研究上述兩種承載條件下這類多孔體構(gòu)件受到載荷作用而導(dǎo)致孔棱失效時(shí)名義載荷與孔率的數(shù)理關(guān)系。在此基礎(chǔ)上，進(jìn)一步研究此類材料在不同載荷作用下發(fā)生各種孔棱失效模式的載荷條件。結(jié)果表明，這些失效模式與多孔金屬的材質(zhì)指標(biāo)、孔率及承受的載荷大小等因素均有關(guān)系，這種關(guān)系也可以進(jìn)行相應(yīng)的具體數(shù)理表征。
關(guān)鍵字: 多孔金屬；泡沫金屬；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
