Elastic deformation of a fixture and turbine blades system based on finite element analysis |
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Authors: | Y Wang X Chen N Gindy J Xie |
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Affiliation: | (1) Department of Manufacturing Engineering, School of Mechanical, Material and Manufacturing Engineering, The University of Nottingham, Nottingham, NG7 2RD, UK |
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Abstract: | 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. |
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Keywords: | Finite element Fixture Turbine blade Surface-to-surface contact |
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