Hi All,

I'm trying to run an FEA on this part to find the yeilding point of this part with a certain amount of weight it holds. The part is an around all welded bracket which pivots on its spindles in one plane. Please see the images to see how its mounted on the device. On the flat bit, it carries the weight of a mast and a few components on top which is bolted on by 4 bolts.

Where the small hole is next to the arm, that part gets pulled by an actuator. The part moves the mast from a horizontal resting position to a vertical position. I have worked out the moment for the mast with the weight on top but I'm unsure what fixtures and where I should apply the forces to get an accurate results of the stresses. The material of the main part is mild steel. I have attached the moments calculations in the zip file too.

The total weight of the mast is: 41kg

Any help will be much appreciated.

Kind Regards,

Babar.

The way I would attack this is fairly straightforward since it looks as if this is something that you would prefer to never break. Linear static analysis should do the trick. (Caveat: It appears as if you may have a 'hidden' stop on this part which may have to be considered separately with its own set of constraints.)

1. Simplify the model and create the necessary solid parts as if it were already welded together (this makes your life much easier.)

2. Split the surfaces as needed (including cylindrical faces) to apply forces and provide constraints at different angles/positions.

3. Determine your loading condition(s) in the various positions and look for a worst-case as well as a start position and end position.

4. Restrain simply (not completely fixed) to try to mimic what will happen IRL.

5. Apply your forces given directions, etc. Do NOT neglect gravity since this is a fairly heavy part.

6. Run a base case w/ only gravity to see if the thing reacts as you should expect and get a baseline of deflection and stress - compare this to hand calculations at least simply for a gut-check.

7. Run other load cases - if any LC shows excessive deflection or stress near or above the yield point - STOP and reconsider the design and/or if you have done something wrong.