A long flat bar has the S-N diagram shown below. The bar is 6in wide by .5 in th

Question

A long flat bar has the S-N diagram shown below. The bar is 6in wide by .5 in thick. It has a 2 in hole in the middle.

a) What is the max load the bar can carry if loaded one time?

b) What is the max load the bar can carry if loaded 10,000 times?

c) What is the max load the bar can carry an infinte of times?

A long flat bar has the S-N diagram shown below. The bar is 6in wide by .5 in thick. It has a 2 in hole in the middle. What is the max load the bar can carry if loaded one time? What is the max load the bar can carry if loaded 10,000 times? What is the max load the bar can carry an infinte of times?

Explanation / Answer

Effective area = 6*5 - pi*2^2 = 17.43

stress = load/area

a) One time load stress = 120 Kpsi ... load = stress* area= 17.43* 120*1000 = 2.09 *10^6 pounds

b) at 10000 time loading stress = 75 kpsi load = stress* area= 17.43* 75*1000 = 1.3 *10^6 pounds

c) infinite loading stress = 50 kpsi. load = stress* area= 17.43* 50 *1000 = 8.7 *10^5 pounds

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