Midrange and Alternating Stress | Goodman Criteria | Axial Fatigue Load

LECTURE 23:
Here the concept of expressing fluctuating stresses in terms of midrange and alternating components is presented and explained. The Goodman failure criteria is presented as a simple technique of estimating the stress thresholds at which the life of parts can no longer be expected to be infinite. An example problem is completed in which an axially loaded connecting rod with a pin-in-hole stress concentration is evaluated for a fatigue factor of safety using the Goodman criteria for infinite life. Marin factors are used to estimate the fully corrected endurance limit. The factor of safety guarding against first-cycle yielding is also evaluated. The load line is plotted on midrange-alternating stress axes along with the Goodman and Langer failure lines. The factors of safety found are inspected relative to the graphical representation.

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This lecture was presented on February 5, 2018. All retainable rights are claimed by Michael Swanbom.

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