Issue 41

A. S. Cruces et alii, Frattura ed Integrità Strutturale, 41 (2017) 54-61; DOI: 10.3221/IGF-ESIS.41.08 54 Focused on Multiaxial Fatigue Evaluation of new multiaxial damage parameters on low carbon steel A. S. Cruces, P. Lopez-Crespo, B. Moreno Department of Civil and Materials Engineering, University of Malaga, C/Dr Ortiz Ramos s/n, 29071 Malaga, Spain plopezcrespo@uma.es A. Lopez-Moreno Department of Materials Science and Metallurgy Engineering, University of Jaen, Campus Las Lagunillas, 23071 Jaen, Spain S. Suman Research Center, Environmental Solution Group, Dover Corporation, Fort Payne, AL, 35967, USA A BSTRACT . Most mechanical components are subjected to the complex fatigue loading conditions, where both amplitude and direction of loading cycles change over the time. The estimation of damage caused by these complex loading scenarios are often done by simplified uniaxial fatigue theories, which ultimately leads to higher factor of safety during the final design considerations. Critical plane-based fatigue theories have been considered more accurate for computing the fatigue damage for multiaxial loading conditions in comparison to energy-based and equivalent stress-based theories. Two recently developed fatigue theories have been evaluated in this work for the available test data. Test data includes significant amount of biaxial load paths. K EYWORDS . Critical plane approach; Biaxial fatigue; Fatemi-Socie damage parameter. Citation: Cruces, A. S., Lopez-Crespo, P., Moreno, B., Lopez-Moreno, A., Suman, S., Evaluation of new multiaxial damage parameters on low carbon steel, Frattura ed Integrità Strutturale, 41 (2017) 54-61. Received: 28.02.2017 Accepted: 15.04.2017 Published: 01.07.2017 Copyright: © 2017 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. I NTRODUCTION ver the years, the analysis of complex multiaxial fatigue loading has mainly been done with the simplified uniaxial approach. This has led to the large amount of knowledge generated in this area, both from experimental [1,2] and numerical [3,4] points of view. Advanced experiments have allowed a number of features to be characterized, including surface and bulk behavior [5,6], crack-closure mechanisms [7,8], evolution of the process zone thru the thickness [9,10], crack branching processes [11], effect of variable amplitude loads such as crack acceleration [12] O