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Metals 2019, 9(3), 275; https://doi.org/10.3390/met9030275

Continuous Estimation of the Crack Growth Rate during Rotating‒Bending Fatigue Testing

1
Departamento de Ingeniería, Universidad de Monterrey, Av. Morones Prieto 4500, San Pedro Garza García 66238, Mexico
2
Facultad de Ingeniería Mecánica y Eléctrica, Universidad Autónoma de Nuevo León, Pedro de Alba s/n, San Nicolás de los Garza 66455, Mexico
*
Author to whom correspondence should be addressed.
Received: 24 January 2019 / Revised: 18 February 2019 / Accepted: 25 February 2019 / Published: 28 February 2019
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Abstract

A method for estimating the crack growth rate in steel during rotating‒bending fatigue testing is presented. Constant deflection tests were conducted in which the initial load remained constant prior to crack nucleation, when it decreased as the crack grew. In the proposed approach, steel samples were sharp-notched to produce a characteristic circular fracture upon loading and the final fracture area was correlated with a ratio of the load prior to fracture and the initial load. In this method, the deflection imposed is a function of a material’s elastic modulus rather than its yield strength and the correlation obtained to estimate the average crack length as a function of the instantaneous load is independent of the applied stress or steel grade. View Full-Text
Keywords: fatigue test; fracture; crack growth; steel; rotating‒bending fatigue test; fracture; crack growth; steel; rotating‒bending
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Martinez-Cazares, G.; Mercado-Solis, R.; Bedolla-Gil, Y.; Lozano, D. Continuous Estimation of the Crack Growth Rate during Rotating‒Bending Fatigue Testing. Metals 2019, 9, 275.

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