Torsion bar is machined from AISI 4130 annealed steel. The centre section of the

Question

Torsion bar is machined from AISI 4130 annealed steel.

The centre section of the bar is fine turned with a diameter of D=30mm and with a drilled transverve hole of d=3mm diameter.

The mounting sections of the bar are D=50mm and the shoulder fillet radius is r=1.5mm

Find

a) Calculate the maximum allowable fully reversed torque, Tn permissible if the torsion bar must have a life in excess of 10^6 load reversals.

b) Calculate the maximum allowable fully reversed torque, T3 permissible if the torsion bar is only required to last for 10^3 load reversals.

c) In normal service , the torque condition in the bar fluctuates between values in a generally random manner, but with some observable trends as indicated in table 1. Machine usage patterns (operating loads) cause the torque to be a proportion of the T3, valve that you determined in part b.

Estimate the life of the torsion bar in normal service.

Torsion bar is machined from AISI 4130 annealed steel. The centre section of the bar is fine turned with a diameter of D=30mm and with a drilled transverve hole of d=3mm diameter. The mounting sections of the bar are D=50mm and the shoulder fillet radius is r=1.5mm Find Calculate the maximum allowable fully reversed torque, Tn permissible if the torsion bar must have a life in excess of 10^6 load reversals. Calculate the maximum allowable fully reversed torque, T3 permissible if the torsion bar is only required to last for 10^3 load reversals. In normal service , the torque condition in the bar fluctuates between values in a generally random manner, but with some observable trends as indicated in table 1. Machine usage patterns (operating loads) cause the torque to be a proportion of the T3, valve that you determined in part b. Estimate the life of the torsion bar in normal service.

Explanation / Answer

(a) 320 N-m

(b) 160 N-m

(c) 12 days

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