Numerical estimation and practical validation of Hooputra's ductile damage parameters

Forming limit diagram (FLD) is a useful criterion for damage prediction, but not suitable for complex operations. Hooputra's ductile damage (HDD) is a proper failure criterion which relies on three relatively difficult experimental tests for each material. In this paper, first, using the FLD criterion, the required difficult experimental tests of HDD criterion are simulated and the HDD parameters for St14 steel are numerically estimated. Then, to evaluate the obtained HDD parameters, damage behavior of the material in a number of benchmark tests is numerically predicted, employing the HDD criterion. Finally, the simulated results are compared with the practical observations and the identified HDD parameters are validated. Comparison of the results reveals the HDD parameters can be numerically and properly extracted, utilizing the FLD and avoiding the difficult experimental tests.