Study of short cracks under biaxial fatigue

P. Lopez-Crespo; B. Moreno; A. Garcia-Gonzalez; J. Zapatero; A. Lopez-Moreno

doi:10.3221/IGF-ESIS.30.31

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Published Sep 11, 2014

DOI https://doi.org/10.3221/IGF-ESIS.30.31

P. Lopez-Crespo

Department of Civil and Materials Engineering, University of Malaga, C/Dr Ortiz Ramos s/n, 29071 Malaga, Spain plopezcrespo@uma.

B. Moreno

Department of Civil and Materials Engineering, University of Malaga, C/Dr Ortiz Ramos s/n, 29071 Malaga, Spain plopezcrespo@uma.

A. Garcia-Gonzalez

Department of Civil and Materials Engineering, University of Malaga, C/Dr Ortiz Ramos s/n, 29071 Malaga, Spain

J. Zapatero

Department of Civil and Materials Engineering, University of Malaga, C/Dr Ortiz Ramos s/n, 29071 Malaga, Spain

A. Lopez-Moreno

Department of Materials Science and Metallurgy Engineering, University of Jaen, Campus Las Lagunillas 23071 Jaen, Spain

Abstract

In this paper a methodology for evaluating crack initiation under biaxial conditions is presented. The methodology consists of evaluating the crack length automatically with digital processing of highmagnification images of the crack. The methodology was applied to study five different strain conditions on a low carbon ferritic-pearlitic steel specimen with tubular shape. A hole of 150 ?m 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. The setup employed allowed detection of the crack to within 6 ?m from the edge of the hole on average and monitoring of the crack during early stages. 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.

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Issue

Vol. 8 No. 30 (2014): October 2014

Section

Miscellanea

How to Cite

Lopez-Crespo, P., Moreno, B., Garcia-Gonzalez, A., Zapatero, J., & Lopez-Moreno, A. (2014). Study of short cracks under biaxial fatigue. Frattura Ed Integrità Strutturale, 8(30), pages 244–251. https://doi.org/10.3221/IGF-ESIS.30.31

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