Question

3) [30 pts] Static bolt factor of safety related to preload For a bolted assembly with eight bolts, the stiffness of each bolt is ko = 0.8 MN/mm and the stiffness of the members is km = 3 MN/mm per bolt. The joint is subject to occasional disassembly for maintenance and should be preloaded accordingly. Assume the external load is equally distributed to all the bolts. It has been determined to use M6 x 1 class 5.8 bolts with rolled threads. a) Determine the maximum external load Pmax that can be applied to the entire joint without exceeding the proof strength of the bolts. The maximum external load for this case is N. b) Determine the maximum external load Pmax that can be applied to the entire joint without causing the members to come out of compression The maximum external load for this case is N

Answer 1

giver Bolf MGXI class 5.8 so Material (Bolt) strength) 517.1068 Mpa, and members Material strength (f) Total Loced M6X1 & dia=6mm dreaq Bolts &n * (6) 2x 8 x 517.1969 PTotal 116966.8ong By all Bolts. PTotal Pb tPm. Prodal kb 1x P Total Bolt kbtkm Preon (By) X 116966.80 0.8 Flere 0.8 +3 24624.589 N Prane Bolt km 116966.80 B kmakb. for member 92342.210 N