steptime value ?

[SERS.09]

Hello everyone,
I would like to know if there is a rule for defining the value of steptime ?

Thank you for your help !

 

[FEA way]

Yes, it should correspond to the actual time period of the simulated event/process if it’s dynamic analysis. In case of statics, step time is generally not a physical time but rather a measure used for load incrementation. Step time in static analyses may correspond to real time if you include rate-dependent material behavior or temperatures from previous transient heat transfer simulation.

 

[SERS.09]

Thank you for your reply.
Yes, I am talking about an explicit case.
What do you mean about the actual time period ?

 

[FEA way]

For example if you simulate an impact that lasts for 0.1 s then your step time should be also set to 0.1 s. Or if you want to analyze the temperature in a boiler after 10 minutes of heating then your step time should be set to 10 minutes (600 s).

 

[SERS.09]

Now, I get what you mean
By the way, I am working on deep drawing process

Thank you for your answer

 

[Mustaine3]

If you simulate the process in Explicit as quasi-static, then you can set the time scale as you like. Usually you'll compensate that with mass scaling.

 

[FEA way]

In case of quasi-static processes (like this one) one of the methods to reduce the computational cost (and get results faster) is to speed up the process artificially (decrease it’s time period when specifying step time). You can also use mass scaling for this purpose. Just keep in mind that both methods have to be used carefully since they can influence the results by increasing inertia forces.

You can find more details about that in the documentation chapter "Explicit dynamic analysis".

 

[SERS.09]

Yes, absolutely

These answers help me a lot !

Many thanks