From testing data: yield stress, ultimate stress, total strain, ratio of strain at elastic limit by strain at strain hardening and the ratio of elastic yield modulus to the strain hardening modulus.
**The requirement is basically of finding power law parameters. Or any other model parameter capable of representing plasticity.
You can use Ramberg-Osgood model to define material property in Abaqus. But be careful about some errors come from this type of material definition.
That's so kind of you for your answer.
But I couldn't find this model in plasticity section. Can U please brief me about where can I get this model input in Abaqus? and how to calculate the "parameters" involved in this model?
Thank-you
Actually I was also trying to use the same model. But as power law. Ramberg-Osgood model is just the combination of hooks law and power law. The problem remains the same. I want to get the values of "K", and "n" parameters from the data available with me. So please help in finding the parameters from the data I had mentioned before.
Thank-you !
From the experimental data you can create a plastic strain true stress curve and fit this data to the curve sigma = K epsilon ^ n. The easiest way would be to use least squares method since you only have to define two parameters (K,n) avoiding complex optimization algorithms. A hint would be to convert the non linear problem to linear using logarithms .
Dear Eleftherios,
I thank-you for your suggestions. But it was little unclear to me. Can U please, attach a picture or file describing what you have suggested(using arbitrary values).
Thanks
To define parameters, the following article will be useful.
https://www.sciencedirect.com/science/article/pii/S2452321619303063
Any model representing plasticity but superior to classical (which has just the yield, ultimate stress and plastic strain as input).
Based on the above document, for R-O only need two parameters i.e yeild and tensile stress. Then use Deformation plasticity in Abaqus to define yeild offset and hardening exponent.
How to get yield offset and hardening exponent from this available data?
- Badges
- Science topic
- Similar topics
- Physical Sciences
- Materials Science
- Material Characterization