不规则蜂窝材料在单向荷载作用下的蠕变屈曲分析  

CREEP-BUCKLING OF IRREGULAR HEXAGONAL HONEYCOMBS UNDER UNIAXIAL LOADING

作　　者：向红[1] 傅衣铭[2] 洪力[2] 

机构地区：[1]华南农业大学食品学院,广州510642 [2]湖南大学力学与航空航天学院,长沙410082

出　　处：《固体力学学报》2008年第2期181-186,共6页Chinese Journal of Solid Mechanics

基　　金：国家自然科学基金(10572049)资助

摘　　要：采用Norton蠕变理论和自由能守恒原理,分析了垂直与倾斜壁厚不等的非正六边形不规则蜂窝材料在面内单向应力作用下的蠕变屈曲行为,得到了蠕变屈曲临界应力与蠕变屈曲失效时间之间的函数关系.讨论了加载应力、初始缺陷、不规则蜂窝材料孔穴壁的厚度、长度与倾斜壁倾角对蠕变屈曲失效时间的影响.Employing the Norton＇s power law creep theory and the principle of free energy conservation, the creep-buckling behavior of irregular honeycombs subjected to uniaxial loading is investigated. In this paper, the irregular honeycombs’ means the thickness of the vertical cell-edge of the honeycombs may not be equal to the thickness of the inclined cell-edge and the geometry of the honeycombs may not be regular hexagon. The relation of the critical stresses and the critical creep-buckling time is derived. The effects of the initial imperfection, the cell-edge thickness, the cell-edge length and the inclined angle of the honeycombs on the response curves of the critical loading and the critical-buckling time are discussed.

关 键 词：蜂窝材料 蠕变屈曲 蠕变屈曲失效时间 

分 类 号：TB383.4[一般工业技术—材料科学与工程]