PARAMETER IDENTIFICATION FOR VISCOELASTIC DAMAGE CONSTITUTIVE MODEL OF PBX
A viscoelastic damage model for PBX based on Visco-scram equations is established by introducing an internal variable for damage characterizing microscopic defects in materials.The model is implemented into finite element software ABAQUS through user subroutines interface UMAT provided by ABAQUS.Combining the forward computation based on ABAQUS and the genetic optimization algorithm,an inverse technique is advanced to identify the parameters of a viscoelastic damage constitutive model for PBX.An example is carried out using the proposed technique.The results show that the technique is feasible for the parameters identification of a PBX viscoelastic damage model,and it can be applied to the parameter identification of other models.