How to give bolt connection when Bolt head and nut face will sit on a cylindrical surface. Please can anyone help me to solve this problem in solidwork simulation.
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You will not be able to get valid results from SW Simulation. The software cannot currently accurately address contact stresses. I would suggest you pull out Roark's and apply the bearing equations for cylinder on flat surface.
Hi James,Thank you for replying. Instead of using bolt connector i have modeled a bolt and used that . Even though it takes more time it will give more accurate result.
No, it will not. SWSim cannot handle bearing contact stresses correctly - you will arrive at an incorrect answer. Also, if you did not model your bolt torque tension then that will compound your error.
Hi james, i Have modeled actual bolt and used bonded connection between the bolt cylinder surface with hole cylinder surface. will it give proper result? This will provide good result only when there is no preload applied to the bolt?
That is a method will not give an accurate answer at all. You have many set-up problems with this analysis as you have described it. Why would you bond cylinder to cylinder? That is not how bolted connections work. Even with threaded connections only about the top three threads carry all the stress.
Why would you not try to account for the bolt preload? That is the force that allows friction to hold the joint in place.
Hi, I will try whatever you suggested. Thank you James.
If you want the bearing stress, it's the clamping force divided by the area of the head -the area of the hole. If you want more sophisticated calculations, I recommend going to any (or all) of these sources:
You are not likely to get good answers for bolted joints from FEA unless you really know that you are doing. Better to extract the loads from FEA and dump them into hand calcs.
Mike, I think he mentioned that it is a bolt against a cylinder surface. Unless it is a saddle bolt head it would more closely resemble a cylinder on a flat surface - hence bearing-contact.
I agree with your bolted joint recommendations.
I read that but my mind showed me the bolt on the flat cap of the cylinder--because I'm not smart.
In that case, you'd probably do the same bolt calcs but convert bearing stress to Hertz contact.
Yeah, that was what I was trying to say.
Hi mike and James.
Actually in my case study i have an assembly containing bolts. On curved surface one bolt head has to sit. i found that it is not possible to give bolt connection because of the curved surface. In my study, bolt is not an area of interest, so can i give simply a bonded connection to the bolt or no penetration connection? will it not affect the entire analysis result? i am not interested in stress and other parameters of the bolt.
If it is not of any interest then why did you even include the hole? Just bond to the next part and call it a day.
Hi James, Now you understood my point of view, When i bound the part to the another part in the assembly what about the result variation ? Will it be valid if i neglect the bolt or bolt connector and provide only bond connection between the parts?
It's not uncommon to simplify an assembly. That is why FEA analysts are valuable and not just anyone should get ahold of this tool. A trained engineer is expected to use proper judgement and identify what is important and what can be ignored - there is no blanket r.o.t. governing all cases - and you need to be careful what you ask or you can get an answer that doesn't make any sense.
Hi James , Sorry for deviating you from my mane intention , And thank you for your valuable response.
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