International Journal of Material Forming

, Volume 3, Supplement 1, pp 1151–1154 | Cite as

Thermo-Mechanical Analysis and Lifing of Ni-Cr SPF Tool

  • Aditya A Deshpande
  • Sean B Leen
  • Wei Sun
  • Thomas H. Hyde
MS19 High temperature sheet forming: S.B. Leen
  • 106 Downloads

Abstract

The paper describes the aniso-thermo-mechanical analysis of a representative large industrial SPF (XN40F, high nickel-chromium) tool. Sequentially coupled thermo-mechanical analyses under realistic loading conditions are developed within a general purpose non-linear FE code, ABAQUS to predict and analyse the complex temperature-stress-strain cycles of the SPF tool. A temperature-dependent, two-layer visco-plasticity model which combines both creep and combined isotropic-kinematic plasticity is chosen to represent the material behaviour. The material constants are identified from multiple strain-range isothermal cyclic tests and stress relaxation tests, over a range of temperatures between 20°C and 900°C. The FE predicted stress-strain data is used in stress-strain-life equations obtained from isothermal fatigue lifing tests at 900°C and the identified constants are validated against the TMF tests and simulative SPF tool test, designed to represent the temperature and stress-strain cycling associated with the most damaging phase of the tool cycle. The predicted SPF tool life is consistent with the simulative SPF tool test life and industrial observations.

Keywords

thermo-mechanical fatigue superplastic forming XN40F tools Ostergren model Zamrik model two-layer visco-plasticity model 

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Copyright information

© Springer-Verlag France 2010

Authors and Affiliations

  • Aditya A Deshpande
    • 1
    • 3
  • Sean B Leen
    • 2
  • Wei Sun
    • 1
  • Thomas H. Hyde
    • 1
  1. 1.Department of Mechanical, Materials & Manufacturing Engineering, Faculty of EngineeringUniversity of NottinghamNottinghamUK
  2. 2.Department of Mechanical and Biomedical Engineering, College of Engineering and InformaticsNational University of IrelandGalwayIreland
  3. 3.University ParkNottinghamUK

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