Elastoplastic frictional contact problem study on interference fits of compressor |
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Authors: | Hongwu ZHANG Aihua LIAO Changhua WU |
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Affiliation: | (1) State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, Dalian, 116024, China;(2) College of Urban Railway Transportation, Shanghai University of Engineering Science, Shanghai, 200336, China |
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Abstract: | The FE parametric quadratic programming (PQP) method developed from the parametric variational principle (PVP) was used for
the analysis of the stress distribution of the 3D elastoplastic frictional contact of an impeller-shaft sleeve-shaft. A locomotive-type
turbocharger compressor with 24 blades under combined centrifugal and interference-fit loading was considered in the numerical
analysis. The solution of elastoplastic frictional contact problems belongs to unspecified boundary problems where the interaction
between two kinds of nonlinearities should occur. To save time in the numerical computation, a multi-substructure technique
was adopted in the structural modeling. The effect of fit tolerance, wall thickness of the shaft sleeve, and rotational speed
on the contact stress was discussed in detail in the numerical computation. To decrease the difficulty of the assembly process
and ensure the safety of the working state, the amount of interference between the shaft sleeve and shaft by press-fitting
should be controlled strictly to avoid the rapid increase of contact stress. The numerical results show that the algorithm
has high accuracy and good convergence. The study can be referred to in deciding the proper fit tolerance and improving the
design and manufacturing technology of compressor impellers.
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Translated from Engineering Mechanics, 2007, 24(1): 186–192, 177 译自: 工程力学] |
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Keywords: | compressor impeller interference fit elastoplastic contact finite element parametric quadratic programming method |
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