what range of the predefined velocity more suitable to be analyzed in abaqus/standard

Hi, Jorgen,

Thank you so much for your reply. you mentioned that abaqus by default does not include inertial effects. when I use the dynamic implicit procedure, it is always requied to input the density or mass of the parts. arent these used to calculate the inertial effects?

Could you please also suggest me that normally what kind of forces are used to compare with the inertial forces, are they reaction forces and contact forces? And at what percentage is more suitable to used dynamic implicit rather than dymamic explicit.

Thank you so much.

Best regards,
Jingfen

Yes, if you use dynamic implicit then inertial effects are indeed included.

I very rarely use dynamic implicit, the explicit approach often runs better for fast loading rates (like impact, etc).

I recommend that you try out the different options to see what works best for your application (and then report back here to report your findings ,)

-Jorgen

Hi, Jorgen,

Thank you so much for your quick reply. I am simulating impact analysis using dynamic implicit currently. Since I know it is more suitable to simulate transient dynamic analysis in abaqus/explicit. So i am performing low velocity impact analysis. currently, the predifined velocity of the impactor is as much as 3 m/sec and 4 m/sec. Because the umat has been developed and it took me a lot of time to make it work in abaqus/standard. The process of coding and compling take a lot of time and trouble, so i dont want to transform it into vumat and do the impact analysis in abaqus/explicit. thats why i am using low velocity impact analysis. but i am not sure is it suitable to simulate these magnitude of impact velocity in dynamic implicit framework. However, I am able to get convergent results using dynamic implicit using umat.

Best Regards,
Jingfen

If you can get it to work with implicit dynamics, then I see no reason to switch to pure explicit.

-Jorgen

Yes, I am with you. I think it is only when simulating highly nonlinear problems or transient problems using implicit dynamics is not able get the converged results that we switch to use explicit scheme.
Thank you, Jorgen.

Now I am more clear with this.

Cheers,
Jingfen