ABAQUS子程序，duncan-ev模型，用于岩土应力应变计算需要的本构模型。-A subroutine of ABAQUS, Duncan- ev model, used in geotechnical stress-strain constitutive model of computing needs.

用fortran语言编写的邓肯张本构模型abaqus子程序。-Duncan Chang constitutive model subroutine in abaqus compiled using fortran language

fortran写的邓肯-张本构模型，供写材料umat的人参考。-fortran write the Duncan -Chang constitutive model for people to write reference materials umat