科研之友
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摘要
To investigate the effectiveness of the warm forming a coupled thermo-mechanical model is developed in LS-Dyna. The temperature dependant material properties of the material, a long-life 3000 series clad aluminum alloy brazing sheet are modelled using a user defined material subroutine accommodating the Barlat YLD2000 anisotropic plane-stress yield surface and the physically motivated Bergstrom hardening rule. The maximum thickness reduction is adopted as a simplified failure criteria to determine both the location and failure depth for the numerical models. The original progressive tooling is modified to incorporate the application of individual temperatures on the dies and the punch. The dies (die and blank holder) are heated with embedded cartridge heaters and the punch is cooled by circulation of chilled water. Select experimental cases are modelled. FEA model is validated against experimental results by comparing punch force versus displacement as well as failure location. The numerical results for either successful or failed simulations are compared with corresponding experimental samples.
- 出版日期2010-4
