A six (6) bolt pattern of SAE Grade 5,1/2 in. -13 UNC bolts is used to clamp two
ID: 1411215 • Letter: A
Question
A six (6) bolt pattern of SAE Grade 5,1/2 in. -13 UNC bolts is used to clamp two steel members together in order to resTst a total 20,000 Ibf external tensile load. The Grade 5 bolt stiffness (k_b) is 2.57 x 10^6 lbt/in and the combined member stiffness (k_m) is 12.69 x 10^6 lbt/in. It has been determined that each bolt is to be preloaded Toll value of 9,00"0 Ibf. Determine the actual bolt overload factor of safety (n_L) for this six bolt pattern to guard against overloading with respect to the Bolt's proof strength Note, you do not need to calculate the other two bolt factors of safety discussed in class. Is it safe to use this six bolt pattern is this application? Why or why not?Explanation / Answer
a) Actual Breaking Strength (lb) / Normal Working Load (lb)
This is used to calculate the factory of safety(nL)
b) yes, its afe to use the six bolt pattern in this application.