The fatigue data for a steel alloy are given as follows: (a) What is the fatigue

Question

The fatigue data for a steel alloy are given as follows: (a) What is the fatigue limit or endurance limit of this alloy? (Express your answer in MPa, 0 decimal place) 290 MPa (b) Determine the fatigue lifetime at stress amplitude of 415MPa (0 decimal place) 20.52 (c) Estimate the fatigue strength at 6e5 cycles. (Express your answer in MPa, 0 decimal place) 290 MPa (d) Suppose the steel alloy is used for an automobile axle that rotates at an average rotational velocity of 600 revolution per minute (RPM). What is the maximum lifetime of continuous driving that are allowable at stress level of 310 MPa? (Express your answer in minutes, 0 decimal place) 11.71 MPa

Explanation / Answer

Answer a) Most steels have an endurance limit about half the tensilestrength. Fatigue limit,endurance limit, and fatigue strength are used to describe the amplitude (or range) of cyclic stress that can be applied to the material without causing fatigue failure.

So the fatigue limit for steel is 290 mpa.

Answer B) fatigue limit = 415/2

= 208

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