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.
| Original language | English |
|---|---|
| Pages (from-to) | 1151-1154 |
| Number of pages | 4 |
| Journal | International Journal of Material Forming |
| Volume | 3 |
| Issue number | SUPPL. 1 |
| DOIs | |
| Publication status | Published - 1 Apr 2010 |
Keywords
- Ostergren model
- Superplastic forming
- Thermo-mechanical fatigue
- Tools
- Two-layer visco-plasticity model
- XN40F
- Zamrik model
Authors (Note for portal: view the doc link for the full list of authors)
- Authors
- Deshpande, AA,Leen, SB,Sun, W,Hyde, TH