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Who can provide a failure model and constants for Aluminium 6061-T6?

Hi.

I am working on the simulations of impact. I have only found a set of constants for AL 6061-T6's JC failure model in the literatures. (D1=-0.77; D2=1.45; D3=-0.47; D4=0; D5=1.6) 

However, the simulation results using these constants were not good.

Who can do me a favour and kindly provide another  set of constants (D1~D5)? Or, may you recommend another failure model and constants for AL 6061-T6?

Thank you very much.

impact and explosion mechanics

Some links in imechanica website:

1. modern explosion science and engineering by Henry Tan

2. 爆炸力学的发展史 by Ying Li

3. Impact and explosion mechanics in China by Huang Peng

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