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oai:riuma.uma.es:10630/303442026-02-03T10:59:16Zcom_10630_2254col_10630_37953

Some observations on short fatigue cracks under biaxial fatigue García-González, Antonio Luis López-Crespo, Pablo Moreno-Morales, María Belén Zapatero-Arenzana, José Arturo Materiales - Fatiga This work presents a new methodology for evaluating crack initiation under biaxial conditions. The methodology consists of evaluating a number of crack parameters automatically with digital processing of high-magnification images of the crack. Five different strain conditions were evaluated on a low carbon ferritic–pearlitic steel specimen with tubular shape. A hole of 150 lm diameter was drilled to enforce the crack to initiate at a particular spot. Different combinations of axial and torsional strains were analysed during the initiation stage of the crack. Fatigue crack propagation curves clearly showed oscillations due to microstructure. It was also observed that these oscillations decreased as the torsional component of the strain was increased. Driving force was also evaluated in crack opening and sliding direction through crack opening displacement and crack sliding displacement. The results demonstrate that crack opening displacement is sensitive to microstructural barriers and crack sliding displacement is sensitive to crack deviations caused by the microstructure. 2024-02-12T07:37:47Z 2024-02-12T07:37:47Z 2015-08-15 journal article P. Lopez-Crespo, A. Garcia-Gonzalez, B. Moreno, A. Lopez-Moreno, J. Zapatero, Some observations on short fatigue cracks under biaxial fatigue, Theoretical and Applied Fracture Mechanics, Volume 80, Part A, 2015, Pages 96-103, ISSN 0167-8442, https://doi.org/10.1016/j.tafmec.2015.05.004 https://hdl.handle.net/10630/30344 http://dx.doi.org/10.1016/j.tafmec.2015.05.004 eng open access Elsevier