In a pre-stressed connection using 8 bolts, the stiffness coefficient of each Kb = 1.0 MN / mm, and the stiffness coefficient of connected parts is km = 2.6 MN / bolt is mm. Pre-stress (Fi) is applied up to 75 percent of the bolt-on safe strength (Sp) value to make a non-permanent connection. The load acting on the connections (bolts) is evenly distributed. The bolts are M6 x 1 ISO 5.8. In case of repeated loading with the maximum load Pmax = 60 kN and the minimum load Pmin = 20 kN for all the connections. Čalculate: a) Safety factor against yielding (np) b) Safety factor for overload (Load factor) (nL) c) Safety factor against joint separation (no). d) Use the Goodman fatigue criteria to calculate the safety factor required to avoid fatigue damage

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