Abstract
Shear stresses along the shaft/hub interface in shrink-fit components, generated by torsional loads, can drive premature failure through fretting mechanisms. It is difficult to numerically predict these shear stresses, and the associated circumferential slip along the shaft/hub interface, due to uncertainties in frictional behaviour and the presence of steep stress gradients which can cause meshing problems. This paper attempts to provide validation of a numerical modelling methodology, based on finite element analysis, so the procedure may be used with confidence in fitness-for-purpose cases. Very few experimental techniques offer the potential to make measurements of stress and residual stress interior to metallic components. Even fewer techniques provide the possibility of measuring shear stresses. This paper reports the results of neutron diffraction measurements of shear stress and residual shear stress in a bespoke test specimen containing a shrink-fit. One set of measurements was made with a torsional load ‘locked-in’. A second set of measurements was made to determine the residual shear stress when the torsional load had been applied and removed. Overall, measurement results were consistent with numerical models, but the necessity for a small test specimen to allow penetration of the neutron beam to the measurement locations meant the magnitude of shear stresses was at the limits of what could be measured experimentally.
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Acknowledgements
The authors would like to thank Dr A. Mahmoudi for his help in conducting the neutron measurements at ISIS. For this work we are grateful for the use of the experimental facilities at ISIS, Rutherford Appleton Laboratories and SINQ, Paul Scherrer Institute. This research project has been supported by the European Commission under the 6th Framework Programme through the Key Action: Strengthening the European Research Area, Research Infrastructures. Contract number: RII3-CT-2003-505925.
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Lewis, S.J., Hossain, S., Booker, J.D. et al. Measurement of Torsionally Induced Shear Stresses in Shrink-Fit Assemblies. Exp Mech 49, 637–651 (2009). https://doi.org/10.1007/s11340-008-9175-8
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DOI: https://doi.org/10.1007/s11340-008-9175-8