SW Simulation: Verify a Non-Slip Condition

Simulation Generality
1

Hello

I'm looking for the most relevant method to check a fairly simple case of non-slippage under SW Simulation:
We have a handling collar made up of 2 half shells joined together by 4 bolts.
This clamp allows the lifting of a piping component, in the event that this component must be handled vertically, the maintenance of the hose during lifting will be ensured by the collar/hose friction which itself depends on the tightening torque of the 4 bolts of the 2 half shells on the hose.

I tried to transcribe this problem on SW Simu in the following way:

  • Static calculation,
  • Modeling of a cylinder (pipe) with fixed boundary condition Diam 273mm,
  • Modeling of the collar (width 100mm) with contact interaction between shells and pipe (friction coeff 0.2),
  • *4 bolt connector with torque tightening,
  • 10kN forces applied to the collar in the direction of the pipe axis.

By iteration on the value of the tightening torques, the calculation starts to converge when a torque of 10Nm is applied to the 4 bolts (error " Slow convergence to equilibrium.
Reduce coefficient of friction and try again." for any torque <10Nm).

Analytically by fairly simplified RDM analysis, a torque of 25Nm would suffice.

Can you give me feedback on the relevance of this approach for the verification of this type of problem? Is there any other way to study this case under Simulation?

Thank you in advance for your help.
Immanuel

2

Hello Emmanuel_soulier,
Welcome on the forum, hoping that we can help find a solution.
For my part, I use very little 'SW simulation'.
But a little video that could maybe match =>https://www.youtube.com/watch?v=T3KXTC22S8o
and this=>https://www.youtube.com/watch?v=DPpEXNM7cRA*and this=>https://www.youtube.com/watch?v=aD54subok-I
So this =>https://forum.mycad.visiativ.com/t/analyse-dun-levage/111185
As well as this =>
SOLIDWORKS Simulation.pdf Data Sheet (401.2 KB)
What's New in SOLIDWORKS Simulation 2022.pdf (1.2 MB)
Simulation_Instructor_WB_2011_FRA.pdf (3.9 MB)

But for my part I am missing one piece of information, on the size of the bolts.
… To be continued, @+.
AR.

3

Hello

Thank you for your feedback, I'll look into it. The bolts are M12 but beyond checking my calculation, I would especially like to see if the methodo approach is the right one or if there will be another way to check this problem.

Immanuel

4

Ok, but the sliding simulation doesn't do it with SW.
@+.
AR

5

I think that it is SW SIMULATION that is used and not the SIMULATION complement of SW PREMIUM which can only do static studies

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6

Hello

I'm not sure I master the differences between these 2 options but I have access to SW Simulation with all the modules and type of studies possible.

Kind regards
Immanuel

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7

Hello

Simulation is not going to solve this kind of ' bastard ' problem on its own where you only have a big bunch of unknowns: tube/collar friction, friction in the threads of your bolts, friction under your screw heads, uncertainty about the tightening...

For me the problem is to be taken backwards: safety coeff on the slip, safe friction value (0.2 is quite high for a metal/metal) - > minimum effort to put on your clamp → to multiply by your safety coeff → calculation of the tightening torque of your bolts.

Once you know how much you are tightening so as not to risk slipping, you can optionally check the resistance of your tube to crushing via a Simulation calculation.

NB: Solidworks takes assumptions to transform the axial force of your bolt into torque (see the simulation help). You can replace the preload by a torque by an axial preload (which you can calculate next to it with assumptions that you have validated).

NB: it's not uncommon for simulations to do anything on friction (knots that grip in particular → it can be seen with very high local constraints)

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