Fatigue strength of inner knurled interference fit joined by forming and cutting methods

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Published Jun 27, 2019
DOI https://doi.org/10.3221/IGF-ESIS.49.41

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Lukas Suchy
TU Chemnitz
E. Leidich
Chemnitz University of Technology, Institute of Design Engineering and Drive Technology, Germany
A. Hasse
Chemnitz University of Technology, Institute of Design Engineering and Drive Technology, Germany
T. Gerstmann
Chemnitz University of Technology, Institute for Machine Tools and Production Processes, Germany
B. Awiszus
Chemnitz University of Technology, Institute for Machine Tools and Production Processes, Germany

Abstract

The joining of machine parts by plastic forming is a common method for transmitting forces and torque. In drive trains, the ‘knurled interference fit’ has a high transmission capacity through the combination of frictional connection and form fit. In the present study, the shaft specimen made of C45 steel material is joined with an inner knurled hub made of 16MnCr5 case hardened steel. The influence of the joining process parameters on the torsional fatigue strength of the shaft-hub connection is investigated by means of experimental studies. The most important parameter is the chamfer angle of the knurled hub, which determines the rate of strain hardening in the material and differs between the cutting and forming joining processes. This study shows that knurled interference fit connections joined by forming achieve a higher fatigue strength and a higher maximum static torque than connections joined by cutting.

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    Issue
    Vol. 13 No. 49 (2019): July 2019
    Section
    SI: New Trends in Fatigue and Fracture

    How to Cite

    Suchy, L. (2019) “Fatigue strength of inner knurled interference fit joined by forming and cutting methods”, Frattura ed Integrità Strutturale, 13(49), pp. 429–434. doi: 10.3221/IGF-ESIS.49.41.

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