Learning Forum

[kikuji.yuki.r3]

I have a question about the Johnson-Cook material strength model and the Johnson-Cook fracture model.
I understand that the Johnson-Cook material strength model is a model in which fracture is defined by yield stress, and the Johnson-Cook fracture model is a model in which fracture is defined by the accumulation of strain, but is this correct? Is this the specific difference?
Also, the Johnson-Cook fracture model is a model in which fracture is determined when accumulated strain exceeds a certain value, but I feel that this is inappropriate to apply to materials such as metals that fracture at a certain value, and that the model is more suitable for materials such as composites in which strain accumulates over a long period of time. I would like you to clarify any incorrect parts of this understanding.

[Erik Kostson]

Hi

These models are for Explicit solvers (e.g., LS-Dyna).

See the LS-Dyna Manual VOlume II (materials) for more details.

If you have any more specific questions still about it, post in the Explicit Dynamics forum.

Erik