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Numerical Analyses of Turning-Induced and Mapped Ti6Al4V Residual Stresses for a Disc Subjected to Centrifugal Loading


Shukri Afazov, Svetan Ratchev, Adib Becker, Shulong Liu,
and Joel Segal


Precision Manufacturing Centre, Faculty of Engineering, University of Nottingham, NG7 2RD, UK


Received: January 31, 2011

Accepted: March 6, 2011


Keywords: mapping surface residual stresses, turning of Ti6Al4V, disc under centrifugal load, finite element analysis

Journal ref: International Journal of Automation Technology, Vol.5, No.3 pp. 326-333, 2011

Abstract



The paper investigates the effects of turning-induced and mapped Residual Stresses (RSs) for a Ti6Al4V disc subjected to centrifugal loading. The turninginduced RSs are predicted in orthogonal cutting using the Finite Element Method (FEM). The FE predicted RSs are validated after performing face turning followed by hole drilling and x-ray diffraction measurements. Numerical analyses are carried out at different Cutting Velocities (CVs) to obtain the RS profiles. The results show that the compressive RSs increase by increasing the CV and the depth of cut. A disc subjected to a centrifugal load is modelled using the FEM where the turning-induced RSs are introduced as an initial condition using mapping techniques. The predicted CV-dependent RS profiles are incorporated into the mapping techniques using the shape function approach. It is observed that the stress amplitudes at the points at which failure occurs are lower when the mapped turning-induced RS profiles are considered in the disc FE model. The lower stress amplitudes are related to prolonging the disc life due to fatigue.
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