【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.更多还原

【Abstract】 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.更多还原