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Error: Hardening Slope is Non Zero

Error: Hardening Slope is Non Zero

Error: Hardening Slope is Non Zero

(OP)
Dear all,

I've been working on weld modelling, in particular looking at how hardening model affects stress.

I have a working model for both Mixed and Isotropic Hardening. However, I cannot get my Kinematic model to work.

I was supplied with enough data for Mixed and Isotropic models, but not Kinematic. Mixed is a combination of isotropic and kinematic models. Therefore, to create a "kinematic" model, I have set the isotropic component of the mixed model (ie cyclic hardening) to zero. I am confident that in theory and equation this should produce the correct results. However, when I try to run the model I get the following error:

***ERROR: HARDENING SLOPE IS NONZERO AT OR ABOVE THE ANNEALING TEMPERATURE.
PLEASE CHECK YIELD DATA UNDER *PLASTIC.

I have checked the model thoroughly and have ensured that no hardening occurs above the annealing temperature (1000 degrees for the parent material and 1100 for the weld material). I have attached an image of the material's plastic properties.

Has anyone had similar problems in the past, or knows what I am doing wrong?

I would love to hear your ideas!

All the best,

Willow

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