Date: 12 Jun 2010

A Finite Element Analysis of Errors in Axisymmetricisothermal and Gleeble Compression Testing of Ti-6Al-4V

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Abstract

Coupled thermo-mechanical finite element modelling of both the isothermal axisymmetric and Gleeble compression testing of Ti-6Al-4V has been carried out in order to give insight into errors which occur when generating flow stress data for process modelling by these methods. A strain-rate and temperature-dependent Norton-Hoff material model is used to represent the material in the analyses and also for calculation of relative stress error. Significant errors are predicted for both testing methods caused by interface friction between the platens and the specimen and plastically-induced heat generation. An axial temperature profile is also predicted in the Gleeble test specimen from resistance heating which increases deformation at the axial centre of the specimen and introduces further errors. Stress errors of up to 25% are predicted.