Abstract: A modified M-K model was
presented in this paper. The theoretical prediction of the
stretching forming limit of sheet metals has been realized with
the M-K model incorporating with two cases of the Hill (1979)
yield criterion. Theoretical calculations show good agreements
with the experimental results for several kinds of materials.
The choices of yield functions and their parameters are based on
either the crystalline plasticity theory or the experimental
data.
Key words:
Plastic instability Yield function
Sheet metal
|