泡沫金属是一种兼具功能和结构双重属性的优秀工程材料,在作为工程构件时就可能遇到剪切载荷的作用.探讨泡沫材料在剪切载荷作用下其构件内部的力学行为,采用隔离分析的简单方式,通过数理推演得出此种承载状态下的力学关系表征.结果显示,泡沫金属材料受到剪切载荷作用而产生破坏时,其构件内部的最大名义切应力大小可用多孔体的孔率以及泡沫金属材料本身固有的特性参量来描述.通过这种数理关系,直接便捷得到该材料在此时的强度判据.
Porous metal foams are excellent engineering materials with dual attributes of structural and functional characteristics, and they may suffer shearing loads when they are used as engineering components. The mechanical behavior within the component is investigated for these materials under shearing loads, and the corresponding mechanical relationship is derived from mathematical-physical deduction, using a simple manner of segregating analysis. The results display that the maximal nominal sheafing stress within the component can be described with the porosity of the porous body and the inherent characteristic parameters of the metal foam itself when it endures the fracture resulting from shearing loads. From this mathematical-physical relation, the strength criterion may be directly achieved for these materials under sheafing loads.
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