The following parameters of the model of plasticity with hardening are defined for positive arguments x>0. The value of the derivative needed to define the stiffness is also specified.
Function:
For 0 < u < Dlim is a product of the f pl function defined as for the model of perfect plasticity determined by the following parameters:
and of the linear function describing the hardening:
Derivative (stiffness):
Limitations:
Note that the coefficients w and a are linked by the relationship: w is a coefficient of curve filling calculated from the following formula:
and from the formula below the value for the 'a' parameter can be calculated:
