Elastic deformation of a fixture and turbine blades system based on finite element analysis
Elastic deformation of a fixture and turbine blades system based on finite element analysis
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DOI：
10.1007/s00170-006-0841-7
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发表时间：
2008-03
期刊：
影响因子：
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通讯作者：
Yan Wang;Xun Chen;N. Gindy;J. Xie
中科院分区：
文献类型：
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作者：
Yan Wang;Xun Chen;N. Gindy;J. Xie
在过去的十年中，有限元分析（FEA）已被用于概括夹具和组件之间的相互作用。大部分的研究都集中在3-2-1夹具与规则的几何形状的组件使用点到点接触元素，其中的夹具元素是由一个点接触组件。由于固定装置-部件对的可预测行为，这样的点对点接触表示可能是足够的。然而，当具有复杂几何形状的部件，例如广泛用于汽车和航空发动机工业的B样条曲面时，点到点方法不再令人满意。针对夹具-涡轮机叶片系统的复杂接触几何和复杂接触状态，采用面-面接触单元对夹具-叶片系统进行有限元分析。详细介绍了有限元建模的一个完整过程，包括几何简化、接触建模、定位器刚度、网格划分、边界条件和加载顺序。在用三坐标测量机测量的工件位移验证了有限元预测的弹性变形的基础上，分析了摩擦力和加工方向等变形的影响因素。
Finite element analysis (FEA) has been used to recapitulate the interactions between fixtures and components over the last decade. Most of the researches were focussed on the 3-2-1 fixture for components with regular geometry using point-to-point contact elements, where the fixture element is represented by a point-contacting component. Due to predicable behaviour of the fixture–component pair, such a point-to-point contact representation may be sufficient. However, when components with complex geometry, e.g. B-spline surfaces, which are widely used in the automotive and aero-engine industries, are of interest, the point-to-point method can no longer be satisfactory. This paper proposes a method of FEA on a system of a fixture and turbine blades by considering the complex contact geometry and complicated contact status of fixture–component pairs using surface-to-surface contact elements. A complete procedure of FEA modelling including geometry simplification, contact modelling, stiffness of locators, mesh generation, boundary condition and loading sequence is explained in detail. Having verified the FEA prediction of the elastic deformation with the displacement of the workpiece measured by coordinate measurement machines (CMMs), the influential factors of deformation, such as friction and machining directions, are analysed.