Reply To: Johnson-Cook material strength model and the Johnson-Cook fracture model.

[Nanda Veralla]

Hello Kikuji,
Can we know more details, perhaps screenshots of this "destruction" behaviour? Are the elements being distorted significantly?
When you run a simulation using only the Johnson-Cook strength model without the fracture model, any distorted element regions might indicate that the material is experiencing significant plastic deformation and potentially reaching its yield point. This behaviour can occur because the Johnson-Cook strength model accounts for material hardening and can predict when a material will yield under stress, even without an explicit fracture model.

If you're observing unexpected results in your simulations, it is best to analyze your input parameters and consider integrating the fracture model for better accuracy in predicting failure events.

Yes, your understanding of both the models is correct, but there are more parameters to it. please have a look at the links in my previous response, and let us know if you're still not certain about which model to use for your application.

Best,

Nanda