Learning Forum

[myriam.colson5]

Hello, I am working on the implementation of the bone. In my simulation I have a tool and a part which is a bone sample. I want my bone sample to have the Johnson cook model. I simulate with SPH particles. So I have researched the characteristics of the bone to compete the model and see how the SPH particles react to the tool which goes down into the material with a displacement rate of 1.8mm/min. However, in my simulation my tool does not move and the SPH particles go in all directions. How can I improve this please ?? Thanks you for your help. 
Myriam

[mohan.urs]

Hey,

Since you have not provided info on the setup. There could be errors in setup as well and not just with your material definition. I would suggest you to look for a close example related to SPH and understand the process and then recreate it for your problem.

SPH — Welcome to LS-DYNA Examples The link consists various examples for SPH capabilities do check them out. In the same link find examples for setup which use johnson cook material model and check whether you have used all necessary keywords to define the material properly.

Regards,
Mohan Urs

[Rob]

Moderator note: please put a more descriptive title on threads in future. If I'm checking for spam on a couple of hundred threads and a title is odd or unexpected it may get marked in error. On the plus side, I now know that bone strength models exist, and assume that explains why MRI grey scale in bones can be used to assign properties.