【摘要】 建立与耳板相连的厚壁圆环的三维模型,确定并提取6个主要应力参考点的应力,分析各点应力在拉、压力作用下的方向及大小关系。结果表明圆环参考点在拉、压力作用下的各向应力分别大小相等、方向相反,圆环发生塑性变形的位置相同。分析参考点的应力和变形,结果表明圆环壁截面的变形不均匀,内大外小,拉力作用下为内凹外鼓侧翘模式,圆环与耳板连接处可能最先发生断裂;压力作用下为外凹内鼓侧翘模式。耳板宽度的增加可以减小参考点在同等拉力作用下的等效应力值,宽度增加到一定的值后,最先发生塑性变形的位置会产生变化。焊接结构和整体式结构的仿真结果对比表明,不考虑焊接残余应力的焊接结构与整体式结构在应力分布及大小上是一致的。实验表明,拉伸作用力下结构的断裂位置发生在圆环与耳板连接处,且最大承受力与耳板宽度成正比。更多还原

【Abstract】 Built three-dimensional model of thick wall annulus which is connected with ear plate and confirmed six major stress reference points to pick up their stress with pull or press force and analyzed relationship of the sizes and the directions of them.The results show that every points of ring have equal stress and opposite direction when suffered pull and press force and the plastic deformation of annulus happens in the same position.The difference of stress and deformation between different points proves that thick wall annulus deforms uneven.The stress inside is bigger than the outside,the inside of the thick wall annulus concaves and the outside bulges with pull and the ring changes exactly opposite with press.The place where plate and annulus meet may break first with pull.Increase of the width of ear plate can reduce stress of the reference point.When the width becomes to be a certain value,the first position where plastic deformation happens will change.Compare of whole model and weld model shows that stress distribution and value are consistent in them,and these two kinds can be used common in engineering.The experiment shows that the broken position happed near the meeting place when face tensile force and largest endurance is proportional to the width of ears.更多还原