Tightening torque

#1

Hi, I have started using Simscale for a few days and i wanted to know if there is any way to apply a tightening torque on screws or if there is a way to simulate it, for example applying a force. Thank you very much.

Non linear analysis
#2

Hi @srenda!

What you can do is to work with pre-stresses and the so called fictitious clearance. This post here might also be helpful to you: Bonded contact is a good approach to avoid simulating bolts?

More on fictitious clearance here: Fictitious Clearance - @FEA-SQUAD , feel free to jump in here and add some additional thoughts.

Let us know if that helped!

Jousef

#3

Thank you very much for that, but I would have another question if you don’t mind.
I’m trying to do a non linear analysis of a beam, applying with a fixed support at one end and a force at the other end, but when I run the simulation this error pops out: “A constant non-zero boundary condition was defined for a nonlinear analysis. Please consider to always ramp your load using a formula or table value in order to ease convergence - otherwise the automatic time stepping will not have any effect on the convergence and your simulation might fail: Force 2”. Do you know how to help me?

#4

Hi @srenda!

Sure no problem, that’s why we have the forum You have to ramp your loading as this will lead to a converged result as the message already states.

Instead of solving all at once the ramping allows the solver to solve the nonlinearities step-by-step (using the Newton-Raphson method) - you can have a look at this doc entry regarding ramping here:

Let us know if that helped!

Jousef

#5

I’m trying to do a non-linear analysis of a beam, with a fixed support at one end and a force at the other end, but when I run the simulation this error pops out: “A constant non-zero boundary condition was defined for non-linear analysis. Please consider to always ramp your load using a formula or table value in order to ease convergence - otherwise the automatic time stepping will not have any effect on the convergence and your simulation might fail: Force 2”. Do you know how to help me?

#6

HI @srenda