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Two parts of a machine are held together by eight equally-spaced M6x1.0 grade 5.8 bolts that...

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Mechanical Engineering

Two parts of a machine are held together by eight equally-spacedM6x1.0 grade 5.8 bolts that are unifomly tightened to provide atotal inital clamping force of 44 kN. Each bolt has a proof stressof 380 MPa, and a threaded area of 20.1 mm^2. The elasticities aresuch that the member stiffness is four times as high as the memberstiffness.

b) You have determined that assembly procedure can reliably setthe initial clamping force to within plus or minus 20% of thenominal value. What do you recommend as a safe working load if yourequire a factor of safety of 2.5 against any failures?

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