Hi all,

I am writing today about something that always confuses me, whether to use 'effective yield stress' or 'yield shear stress' values in my ABAQUS simulations.

I have found in the literature that the two quantities differ by a factor of sqrt(3):

k = sigma_y / sqrt(3)

where k = 'yield shear stress' and sigma_y = 'effective yield stress'.

When I ran my simulation, I inputted material data like this:

-------------------------------------------------------
Yield stress | Plastic strain
3e8 | 0
3e8 | 0.05
3e8 | 0.1
3e8 | 0.15
3e8 | 0.2
3e8 | 0.25
3e8 | 0.3
3e8 | 0.35
------------------------------------------------

to try and resemble perfect plasticity. What I am wondering is this: Is 3e8 the effective yield stress or the yield shear stress? It matters for me when I compare to my analytical work. Any help is much appreciated.

P.S. I think the 'effective yield stress' is sometimes called the 'tensile yield stress' as well but I am not sure.

Thanks,

Frank

Abaqus ​​​​​​​