Mixed-mode fatigue crack growth thresholds: A personal historical review of work at the National Engineering Laboratory, 1975–1989

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Abstract

Mixed mode fatigue crack growth thresholds in metals were investigated at the National Engineering Laboratory from 1975 to 1989. Re-assessment confirmed that thresholds are determined by the formation and growth of mode I branch cracks at the tip of the initial crack. Lower and upper bounds can be defined, and used for design purposes. For mixed mode I and II loading, the presence of corner points and hence corner point singularities, encourages mode I branch crack formation. Transforming a mixed mode crack into an equivalent mode I crack, as is done some design standards, is not always satisfactory.

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Pook, L. P. (2018, January 1). Mixed-mode fatigue crack growth thresholds: A personal historical review of work at the National Engineering Laboratory, 1975–1989. Engineering Fracture Mechanics. Elsevier Ltd. https://doi.org/10.1016/j.engfracmech.2017.10.028

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