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

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 we...

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Bibliographic Details
Published in:Metals (Basel ) 2019-02, Vol.9 (3), p.275
Main Authors: Martinez-Cazares, Gabriela, Mercado-Solis, Rafael, Bedolla-Gil, Yaneth, Lozano, Diego
Format: Article
Language:English
Subjects:
Bend tests
Bending fatigue
crack growth
Crack initiation
Crack propagation
Cracks
Deflection
fatigue test
Fatigue tests
fracture
Fracture mechanics
Geometry
Load
Metal fatigue
Modulus of elasticity
Nucleation
Ratios
rotating‒bending
Rotation
steel
Stress concentration
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Summary: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.
ISSN:2075-4701
2075-4701
DOI:10.3390/met9030275