Duncan-Chang Material Properties

The Duncan-Chang material model is used to simulate soil. It assumes a hyperbolic stress-strain relation and was developed based on tri-axial soil tests. The model accommodates the variation of Poisson’s ratio by means of stress-dependent Poisson’s ratio (E-ν model) or stress-dependent bulk modulus (E-B model).


Refer to the following page,"Duncan-Chang Theoretical Description", for additional clarification and equations in which the material properties are used.

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The following material properties are used to stabilize the analysis at time zero and if the minor principal stress (s3) become less than or equal to zero. Values for time 0 (and before failure) and after failure are entered.