Difference between ANSYS and ANSYS LS DYNA 1

[vtmike]

Hi,

Can anyone tell me what the difference is between using ANSYS static non-linear analysis and ANSYS LSDYNA? Is LSDYNA for extremely large deformations? and how would you recognize how much deformation ANSYS non-linear can handle?

 

[Jordonlaw]

Dyna is an explicit code meaning it works on equations of motion rather than a stiffness matrix and hence is on stable for short duration event such as crash or ballistic studies. You can use it for quasi-static analyses if you are careful ........... just like I'm about to do. The 'Ansys' bit of Ansys Dyna is just to provide an Ansys interface for input/output.

You didn't say which version of Ansys you are using. There is an implicit and explicit version oth of which work via a stiffness matrix approach. They aren't much use for short duration events as the timestep become extremely small and the run times very long to get good results.

Horses for courses.