I am designing a bolted joint to take a high static load (over 5 tons). I have done the analysis and sized the bolt accordingly. With this high load, the bolt was found to be about an inch. It will need to be prelaod to 75% proof load (number can be slightly different from different source, not important at this point). The problem is the preload together with the static load is quite close to the yield point of the clamp material. The question is whether there is any industrial standard to allow reducing the preload. I did the calculation to determine the jaw separation force and the static load is nowhere close to that number( factor of safety of 4). If that is the case, does it mean the preload can be reduced (say 60% instead of 75%)? To make sure the bolt will not get loose due to reduced preload, I am planning to have lock wire in place.
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