Friction in Non-linear and event simulation

Anonymous · ‎03-12-2019

Hi,

I am trying to use Fusion 360 to validate the friction theory between two blocks. The material of the block is stainless steel with 8 kN/m^3. I have set the friction coefficient as 0.3. The friction resistance between the two blocks should be 2.4 kN based on hand calculation (vertical force * friction coefficient).

The contact between the two blocks is separation and symmetric. I have fixed the lower block and restrain the top block in the Z axis to ensure only the sliding along force direction will occur during simulation.

As I applied the horizontal force which is equal or slightly bigger than the friction resistance, the simulation still can run under non-linear analysis and the displacement was not same as what I expected (when the horizontal force >= friction resistance; the blocks will be split and slid along the force direction).

The same thing happened to the event simulation. Two blocks were not split apart under the force which is larger than the friction resistance.

Can someone with this kind of knowledge help me with this issue?

Many Thanks

Anonymous · ‎03-12-2019

Can you share the file?

Anonymous · ‎03-12-2019

Hi,

This is the file link.

Anonymous · ‎03-12-2019

https://a360.co/2TAqXhw

algor_neil · ‎03-13-2019

8 kN/m^3 ? That's a pressure not a force.

Anonymous · ‎03-13-2019

The volume of steel is 1m^3, so the force due to gravity = 1*8 = 8 kN

MRWakefield · ‎03-14-2019

Ok, I think your calculations are just slightly off.

Your upper block has a volume of 1m³ (1x10⁶ cm³) and has a density of 7.85g/cm³.

Block mass (M) = 1e6 * 7.85g

=7 850Kg (7 850 000g, or 7.85 Tonnes)

Force (N) = Mass (Kg) * Acceleration (m/s²)

Acceleration in this case is 9.81m/s² (gravity).

F (gravitational) = 7 850 * 9.81 N

= 77 008.5N

Coefficient of friction (static) between blocks = 0.3

Frictional force = Normal force * Coefficient of friction

Frictional force = 77 008.5 * 0.3 N

= 23 102.55 N (23.1KN)

Give it another go at 24KN.

Hope this helps.

If this answers your question please mark the thread as solved as it can help others find solutions in the future.
Marcus Wakefield

____________________________________________________________________________________
I've created a Windows application (and now Mac as well) for creating custom thread files for Fusion. You can find out about it here. Hope you find it useful.
If you need to know how to offset threads for 3D printing then I've created a guide here which you might find useful.
If you would like to send me a tip for any help I've provided or for any of my software applications you've found useful, you can do this via my Ko-Fi page here.
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Anonymous · ‎03-14-2019

Ture that. I will rerun the model. But my point is that if Fusion 360 can valid the friction theory. Could you help me with that if you know?

Thanks.

MRWakefield · ‎03-15-2019

Sorry I haven't used the Simulation environment in Fusion 360 so I can't be much help to you there.

If this answers your question please mark the thread as solved as it can help others find solutions in the future.
Marcus Wakefield

____________________________________________________________________________________
I've created a Windows application (and now Mac as well) for creating custom thread files for Fusion. You can find out about it here. Hope you find it useful.
If you need to know how to offset threads for 3D printing then I've created a guide here which you might find useful.
If you would like to send me a tip for any help I've provided or for any of my software applications you've found useful, you can do this via my Ko-Fi page here.
____________________________________________________________________________________

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Friction in Non-linear and event simulation

Friction in Non-linear and event simulation

Friction in Non-linear and event simulation