Elastic-Linear Hardening Model of Plasticity

[bill nye scienceguy!]

I'm analysing a simple truss structure in Abaqus, comparing the results from linear elastic, elastic perfect plastic and elastic linear hardening assumptions.

When it comes to linear hardening I need to define in Abaqus the plastic region of the stress strain curve. I know the gradient E of both regions of the curve and the yield stress and strain. I need to input a value of yield stress and plastic strain in Abaqus' plastic material properties so I was going to do this by plotting the whole curve and at arbitrary values of post yield stress drop a line parallel to the elastic curve to find the plastic strain.

Is this a valid method and if not what should I do instead?

thanks

 

[Navin A S]

Yes, this is a valid method for defining the plastic region of the stress-strain curve in Abaqus. It is important to make sure that the given elastic modulus and yield stress and strain values are consistent with the slope of the line you draw parallel to the elastic curve. Additionally, you can use an incremental strain hardening model to define the plastic region in Abaqus, where you can define the parameters of the plastic strain increment (e.g. strain hardening exponent) and the maximum plastic strain.