Regarding the prediction of onset of necking

[ripud...@mt.iitr.ac.in]

Dear team,

I am looking for a method to predict the onset of necking in a material. I was expecting skewed distribution of the von mises/equivalent strain near the UTS (shown in the attachment) at each quadrature point, but it came out to be normally distributed with a very small spread (also attached). Is there any reason I cannot obtain the distribution of equivalent strain corresponding to necking?

I'm using the DeformationGradient application and doing rate-independent tensile deformation.

Also, are there any other ways to make this prediction of necking in PRISMS?

I am also attaching a paper for context.

https://doi.org/10.1016/j.ijplas.2015.06.013

[DANISH KHAN]

For modelling necking, you need to have damage in your constitutive model. 

[ripud...@mt.iitr.ac.in]

Is it possible to incorporate a damage model into PRISMS ?

[mohammadreza yaghoobi]

Hi,

You need to modify the constitutive model to include damage. I suggest you modify the rate-dependent version of the model to include damage which is here:

https://github.com/prisms-center/plasticity/blob/master/src/materialModels/crystalPlasticity/MaterialModels/RateDependentModel/calculatePlasticity.cc

You can include the damage based on the model you shared earlier.

Detail of the model implementation is presented here in supplementary note 5:

https://www.nature.com/articles/s41524-021-00506-8#Sec21

https://static-content.springer.com/esm/art%3A10.1038%2Fs41524-021-00506-8/MediaObjects/41524_2021_506_MOESM1_ESM.pdf

Please let me know if you have any questions.

Thanks

Reza

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[Ripudaman Singh]

Thank you for your reply. I'll look into it.

[Jishnu Satchidanand]

hello, could anyone share the calculatePlasticity.cc file, im not able to do it.