轮盘-叶片组件的统一应力分析

本文用含接触面的循环对称计算模型进行轮盘-叶片组件的统一有限无应力分析。此法考虑了榫头与榫槽间的三维接触传力,利用循环对称性,不人为假定轮盘切开处的边界条件,可同时得到轮盘及叶片中的应力分布。还用另外五种简化计算模型来分析同一计算对象。将所得结果同含接触面的循环对称模型的计算结果作比较,评价了简化模型的适用性。

INTEGRATED STRESS ANALYSIS OF A BLADED DISK ASSEMBLY

The integrated finite element stress analysis for a bladed disk assembly has been carried out, using the cyclic symmetric model with contact surfaces. The model consists of a sector of the disk and a blade attached to this sector. The technique employed has the following features. l.The contact of blade root and disk groove is taken into account in the analysis by incorporating three-dimensional contact relations at tde contact surfaces into stiffness equations of the model. Consequently,in comparison with the results obtained separately from analysis of the blade or the disk,the displacements and stress fields ac-quired in both the blade and the disk are more accurate. 2.ln order to avoid the assumption for certain boundary conditions,the cyclic symmetric relations are employed at the corresponding boundaries of the disk sector. 3.Several different kinds of elements are applied to modeling the structure. For comparison five other simplified models are also evaluated.