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在汽轮机的零部件中,壳与体结合在一起的例子是非常多的,例如低压缸末级自由长叶片的叶型部分与叶根部分;转子与叶轮;叶轮与叶片;再如计算隔板时,隔板体与其中的汽叶等等,都会遇到这个问题。用有元限分析这类问题的应力时,若只用一种单元,为了能反映结构特征的三维体单元,必须在壳体部分的单元增加很多(由于长宽比例限止),增加很多节点,不但引起计算
Examples of the combination of the shell and the body are very numerous in the components of the steam turbine. For example, the blade-type part and the root-part of the free-end long blade of the low-pressure cylinder; the rotor and the impeller; the impeller and the blade; When the partition body with the vanes and so on, will encounter this problem. When using finite element analysis of stress for such problems, if only one element is used, in order to reflect the three-dimensional volume element of the structural features, many elements must be added in the shell element (due to aspect ratio limitation) Not only caused the calculation