Question

1) Determine unmodified fatigue strength (units = MPa) of hot-rolled 1030 steel shaft in axial loading for a design life of 10,000 cycles. Do not apply any fatigue correction factors. SN __________ MPa

2) Determine unmodified fatigue strength (units = ksi) for a normalized 4130 steel shaft in bending for a design life of 10^7 cycles. Do not apply any fatigue correction factors. SN __________ ksi

3) Determine unmodified fatigue strength (units = MPa) for cold-rolled 3003 aluminum rod in torsion for a design life of 10^8 cycles. Do not apply any fatigue correction factors. SN __________ MPa

4) Determine fatigue correction factors for the 0.43 inch DIA shaft from H04 using 4340 steel (quenched and tempered at 800° F). The surface of the shaft was machined but was not ground. The shaft is in bending and torsion, operates in normal environmental temperatures and should have 99.9% reliability. Cload _________ Csize _________ Csurf _________ Ctemp _________ Creliab _________

5) Determine modified fatigue strength (units = ksi) of for the steel shaft from H04 and problem 4) above for a design life of 10^9 cycles. SN __________ ksi

Answer 1