• Card 7 / 36: Which number of cycles conventionally lies between low-cycle and high-cycle fatigue?
    A) 10
    B) 1000
    C) 200,000
    D) 20,000,000
    E) 1,000,000,000

    Answer:
    B) 1000

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Explanation:

This is a somewhat arbitrary number, but some justification for the names and demarcation can be obtained by looking briefly at the figure in the reading for sub-subunit 3.3.6 Cyclic Fatigue. Note that the plot of stress versus lifetime has an inflection point near N = 1000; that is, the shape of the curve changes from concave-up to concave-down near this point. This point may be different for different materials and conditions.

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Mechanics I ME102

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Attribution:  Stephanie Redfern, Ranjeet (Ron) Agarwala, and Dr. Steve Gibbs. Mechanics I. The Saylor Academy 2014, http://www.saylor.org/courses/me102/
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