涡轮盘榫齿载荷分配的一种计算方法
A COMPUTATIONAL APPROACH TO THE LOADS SHARED BETWEEN THE TEETH OF TURBINE LUGS
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摘要: 通常在有限元计算中,力和位移的边界条件要精确地给出。但是对于力和位移边界条件不能充分给出的一类问题,如接触问题,目前解题尚有一定的困难。对于涡轮盘和叶片的榫齿连接,求解这种含多面接触的工程计算,往往是假定一种边界条件,即首先预估榫齿上的载荷,然后进行轮盘或叶片的有限元分析。本文试图以完整的榫齿连接区域作为有限元模型,利用弹性位移叠加原理求载荷在榫齿上的分配,并根据这一分配进行了应力计算和断裂分析。Abstract: A displacement superposition method based on the principle of compatibility of deformation is approached for solving multi contact problems.The formulas derived in this paper has been programmed to solve the load distribution between the teeth of a turbine disk lugs in association with FEM program,and then the maximum stress at each fillet of tooth is calculated.A study on fracture mechanics of the disk lug with different cracks in the tooth fillet is also presented.The results are in satisfactory agreement with data of the photoelastical experiments.
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