Time period problem in hot torsion simulation

[Marioddn]

Hi to everyone,

I'm trying to simulate the torsion (360 degree) on a specimen. I have the flow curve at hot temperature (900° constant) at strain rate=0.1. So I edit the material section of the model and I set the elastic behavior (Young modulus and Poisson ratio) and plastic behavior (yield stress and plastic strain). In the plastic section I put the data with the toggle on strain rate dependent and I set 0.1. My question is: the time period is equal to time necessary to perform one rotation in the experiment?

 

[tkks2040]

Short answer is yes.

 

[Marioddn]

Ok thank you for the answer!

 

[Marioddn]

For example with strain rate=0.1 I have a time period of 11s, which could be an reasonable initial increment size?

 

[tkks2040]

Assuming that you are running Implicit..I would initially run the simulation for a total time step of 1 second with a initial time increment of 1E-3 and a minimum time increment of 1E-6. Depending on the deformations, the time step would adjust itself through the simulation. The simulation would give you problems if the time increment hits the minimum, at which time you can change the time increment settings. If the job runs fine, and is not taking a lot of time, I'd increase the total time step to attain the desired amount of twist.

 

[Marioddn]

Thank you so much!