Structural constraints in a crane hook

[Anonymous]

Good morning, we are dealing with the simulation toolbox in Fusion360, in particular for the static stress analysis. Anyway, we have some doubts related to the structural constraints: you can see in the pics attached the constraints that we have assigned. Namely, we have two loads, one applied on the hook (to represent the weight of the object transported) and one applied on the pulley (to represent the force of the crane).  

Can you help us in understanding if these constraints are correct or if it is better to make different decisions? Thank you in advance. 

[Anonymous]

Here the pictures with the first three constraints. 

[Anonymous]

Here the others constraints. 

[TheCADWhisperer]

Can you File>Export your *.f3d file to your local drive and then Attach it here to a Reply?

[Anonymous]

I have attached here the file. 

[TheCADWhisperer]

What is this?

What is this?

These should be one body - why do you have modeled as two bodies?

[TheCADWhisperer]

What is this?

This doesn't make logical sense?

This might last all of 3 seconds under load.

Why did you model as two bodies?

This should be one body - did you not look at my example posted earlier?

[TheCADWhisperer]

Does Ctrl b (Cmd b) return any issues?

[TheCADWhisperer]

[TheCADWhisperer]

We can progress to the advanced topic of FEA - but first the components should be corrected.

In FEA - these simple parts should be analyzed separately rather than as an assembly.

https://www.youtube.com/watch?v=tOwnqXsIiMw&list=PLp5izJt_zvN0KUccGh5OrgbNTZ_c4vYxs&index=19

[Anonymous]

We have corrected the bodies, but we still have some doubts about the positioning of the constraints on the parts.

[TheCADWhisperer]

Next we will analyze each body one-at-a-time.

Right click on each body and select Remove.

Right click on the Remove feature for the Hook and select Suppress Feature.

(By suppressing or not suppressing we can get one body at a time.)

[TheCADWhisperer]

Delete all previous Constraints/Loads - you should have only on Constraint on the cylindrical face as shown above.

[TheCADWhisperer]

Select SIMPLIFY

[TheCADWhisperer]

Start a new sketch on the XY Plane.

[TheCADWhisperer]

The load on the hook will contact the area of a chain or strap - we need to define the area of contact.

Create sketch as shown in image.

[TheCADWhisperer]

Go to Modify>Split Face...

Use the sketch to split the contact face of the hook.

[TheCADWhisperer]

Click Finish Simplify and then apply the load to the split contact face of the hook as shown...

Run the analysis for the hook.

Report back on the results.

Then we can move on to the next component...

[Anonymous]

We have done the same analysis on the hook part. 

[TheCADWhisperer · Accepted solution]

Right click create a New Simulation...

Suppress Remove of Body 15...

Select SIMPLIFY...

Create a sketch to split the clamping faces...

Split the top and bottom clamping faces...

Fix the clamping faces...

Apply the Bearing Load (be sure to select both faces at once).

Make sure the load arrows are pointing in correct direction (I had to Flip Direction).

Note that the Displacement is shown as exaggerated..

You could put it on Actual...

If the displacement was excessive (not in this case) I might increase the width of the bushing to limit the inward displacement.  Split faces for the bushing contact and add Frictionless constraints to the faces.

Next we can test the Pin.

Split the faces for contact with the bracket and with the bushing.

Add the Pin Constraints and the Bearing Load...