A Mixed Experimental-numerical Energy-based Approach for Fatigue Life Assessment in Notched Samples under Multiaxial Loading

• DOI: 10.18502/keg.v5i6.7107
• Publication Date: 2020-06-03T05:18:45Z
• Authors: Ricardo Branco; F. Nogueira .; D. Costa .; P. Prates .; V. Antunes .
• Keywords: Strain energy; Strain (injury); Energy density; Low-cycle fatigue

This paper presents a methodology to predict the fatigue lifetime in notched geometries subjected multiaxial loading on basis of cumulated strain energy density. The modus operandi consists defining an energy-based master curve that relates density with number cycles failure using standard cylindrical specimens tested under low-cycle conditions. After that, elastic-plastic finite-element model representative material behaviour, geometry and scenario is developed used account for at crack initiation site. then averaged Theory Critical Distances inserted into energy- based estimate expectancy. Overall, comparison between experimental predicted lives has shown very good agreement.
 Keywords: Multiaxial fatigue, Fatigue life prediction, Strain