A solid round bar, 25 mm in diameter, has a groove 2.5 mm deep with a...

 

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A solid round bar, 25 mm in diameter, has a groove 2.5 mm deep with a 2.5 mm radius machined into it as shown in the figure. The bar is made of a cold drawn steel with Sut = 64 ksi and is subjected to a purely reversing torque of 1770 lb, in resulting in high cycle fatigue. Will the bar last forever with this loading and geometry if the temperature and the reliability factors are both 1? If not, then what is the reason? Also, then find the finite life of the bar. 2.5 mm EXE 25 mm 20 mm A solid round bar, 25 mm in diameter, has a groove 2.5 mm deep with a 2.5 mm radius machined into it as shown in the figure. The bar is made of a cold drawn steel with Sut = 64 ksi and is subjected to a purely reversing torque of 1770 lb, in resulting in high cycle fatigue. Will the bar last forever with this loading and geometry if the temperature and the reliability factors are both 1? If not, then what is the reason? Also, then find the finite life of the bar. 2.5 mm EXE 25 mm 20 mm