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7. (15 pts) Consider a shaft that is rotating at 150 rpm driving a bevel gear as shown The shaft is below. supported by bearings at locations A and B. A is the thrust bearing. The motor input torque i by the torque at the gear. 0.4 FL F+ z direction) 0.2 Ft 35 mmm 50 mm Motor torque 15 mm50 mm dia a. (10 pts) Find the equivalent mean and alternating stresses at the location along the shaft axis most likely to fail (identify this location as x-?? mm). There are no stress concentrations in this case. Thrust bearing
5pts) After including stress concentrations, we find that b. -125,000 Fe and ơem-110,000 ơea where F, is in N, and σ is in Pa, Find the value of Fi such that the safety factor is 1.5 for 10 cycles. The shaft is fabricated from steel with a modulus of 209 GPa, and ultimate tensile strength of 290 MPa and yield strength of 455 MPa. Assume a mirror finis Standard for temperature conditions. The size is such that the gradient factor is 0.9. h, R R Moore Standard for relia bility, RR Moore
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7. (15 pts) Consider a shaft that is rotating at 150 rpm driving a bevel gear...
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