NonlinearCamClay
Modified Cam-Clay Model
The NonlinearCamClay
class defines a basic framework using modified Cam-Clay yield surface and associative flow rule.
Theories can be seen in Chapter 10
in Computational Methods for Plasticity: Theory and Application, in which there
are some minor errors in the derivation of consistent stiffness.
This model resembles the one in ABAQUS but the third stress invariant does not enter yield surface. As a result, the
yield surface on the
Interested readers can also refer to the corresponding section in Constitutive Modelling Cookbook for more details.
The following function is chosen as the yield surface.
where
The same function is used for plasticity potential so that
where
The NonlinearCamClay
class allows
Please note in practical applications, this value is negative as soil is often in compression.
History Layout
location | paramater |
---|---|
initial_history(0) |
accumulated plastic strain |