Pmax=80 kips and Pmin=20 kips. Assume the load is equally distributed to all the bolts. It has been determined to use ½ in-13 UNC grade 8 bolts. Determine the fatigue factor of safety using the Goodman criteria.

Explanation:

Minimum Proof strength (sp) = 120 kpi

minimum tensile strength (sat) = 150 kpi

Now, calculate the load per each using the equation

calculate the preload for non permanent connection

Calculate the stiffness constant for the assenbly

Substitute

c=0.25

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a.   mass number from atomic number