A part made of Ti-6Al-4V (solution treated and aged) will be subjected in service to a stress amplitude of σa = 500 MPa, and the desired service life is 60,000 cycles. (a) What are the safety factors in stress and in life? Do these seem reasonable for an actual engineering application? Explain why or why not. (b) If a safety factor of 1.3 in stress is considered adequate, how many cycles can be applied in service before the part is replaced?

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