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When to account for bending in welded on plate

When to account for bending in welded on plate

(OP)
Hi all,

I'm working on a part and am not sure if the bending stresses should be accounted for in a welded on nut plate and d if needed how that would be done.

I'm welding the attached nut plate to a box tube and a preliminary calculation shows more that adequate strength in the weld [0.707×(2×2.5in+2×3.75in)×0.3125in×68,000psi=188kip]. My question is if and how I accommodate the fact that the nut plate is relatively thin compared to is foot print. If the nut plate were even an inch thick I would assume this is sufficient, by UT at 3/8 I am not confident.

I appreciate any help that can be provided.

RE: When to account for bending in welded on plate

Since you seem to have doubt as to whether or not it is adequate, that is your indicator that you should take a look at it. As for how you go about it, you could do it the super accurate way using FEA or get a close approximation by hand calculations. If this is part of a rocket going to the moon I would use FEA, if this is a DIY house project I would use hand calcs. Without seeing a sketch of the piece and the loading, I cannot provide any meaningful advice on how to go about checking it. It does state a capacity of 25000 lbs, so I assume you know if your load is less than that and also if it is in the same direction as the direction of the load for the suggested plate capacity.

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