Explicit solver for visco-hyper-elastic simulation

[huayen]

Hello all,

I am new here, looks like this is a very professional place for discussing FE modeling.

I am doing simulation of human physiological process involving complicated contact behaviors, and the time period is not short. Due to the difficulty of implicit solver (such as ABAQUS/Standard) in modeling complicated contact, I am trying to turn to explicit solver.

My first consideration is ABAQUS/Explicit. According to ABAQUS manual, explicit can be used to simulate quasi-static process. However, I am not sure whether it can be used for simulating viscous behavior, since ABAQUS keyword manual shows the option *VISCO is available only in ABAQUS/Standard.

Another consideration is using LS-DYNA. However, even though LS-DYNA claim it can simulate quasi-static behavior, all examples I saw are just for simulating very short period. So, anyone can tell whether LS-DYNA can be used for my case?

Thanks in advance for your advise.

Regards,
Eric

[huayen]

Found ' *VISCOELASTIC ' can be used in ABAQUS/Explicit. Sorry for this newbie's question.

So, anyone used LS-DYNA to simulate 'long-period' process?

[Jorgen]

Note that LS-DYNA can perform both implicit and explicit simulations. Implicit simulations are the first choice for long-term quasi-static simulations. If you cannot make your simulation work with implicit, then you can use the explicit mode in LS-DYNA. In this case it is common to use mass scaling in order to enable simulations of longer period processes. There is a limit on how much mass scaling you can apply before inertial effects become problematic, and that will limit the extent of the simulation time limit.

- Jorgen