Peer-Reviewed Journal Details
Mandatory Fields
Deshpande, AA,Leen, SB,Sun, W,Hyde, TH
2010
April
Int J Mater Form
THERMO-MECHANICAL ANALYSIS AND LIFING OF Ni-Cr SPF TOOL
Published
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Optional Fields
thermo-mechanical fatigue superplastic forming XN40F tools Ostergren model Zamrik model two-layer visco-plasticity model
3
1151
1154
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 degrees C and 900 degrees C. The FE predicted stress-strain data is used in stress-strain-life equations obtained from isothermal fatigue lifing tests at 900 degrees 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.
DOI 10.1007/s12289-010-0976-9
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