Abstract
The influence of parameters in the Gurson's constitutive equation for porous plastic materials on ductile fracture at an interface crack under mixed mode loading is discussed based on a comparison of computational and experimental results. A simple method to estimate the parameters using the deformation data of tensile specimens and the Kalman filter is proposed. A finite element simulation is performed to demonstrate the usefulness of the proposal method. It is suggested that two different specimens (e.g., one is a rectangular plate with a center hole and the other is a side notched plate) are necessary to guarantee a correct estimation.
