Chip formation parameters for Johnson-cook model

[ttopoz]

hello

I am working on chip formation process in Abaqus/explicit. however i could not find exaxt parameters. if anyone have the values of Damage evolution for energy type in johnson-cook damage initation for 4340 Steel. and I also need maximum shear stress value, slip stifness and contact overclosure stifness value for contact definition in ABaqus for this material. if anyone help i will be appreciated.

thank you

tahsin