M = 1778 Nm (I calculated this as being the weight is divided equally between all 4 bolts so 613N per bolt x 2.9m). So I am using the basic equation, Stress = (M*y)/I The bolted flange interface is is 4 x 8mm bolts all spaced equally 80mm apart. This has a bolted flange interface at the far end and I want to verify that the bolts can take the weight when I lift the tool from horizontal to vertical from the other end by crane via a lifting point. I have a tool that is 2.9 metres long and weighs 250Kg. I am trying to perform a simple bending stress calculation on a bolted flange interface but keep calculating a huge bending stress and can’t see where I am going wrong.
