An analysis of experimental techniques for estimation of dissipated energy evolution in metal alloys under plastic deformation

Abstract

This work is devoted to the comparative analysis two approaches for investigation of energy dissipation in metal under fatigue crack propagation. The flat specimens with V-shaped stress concentrators from steel 304 AISE and titanium alloy Grade 2 were tested. The dissipated energy was measured using both original contact heat flux sensor and IR camera FLIR SC5000. The results of IR monitoring were analysed with a goal to estimate the amplitude of second temperature harmonics (D-mode). As a result of the study, we have shown that the dissipated energy values estimated by both methods have a good qualitative agreement. The measured values allows us to propose a correlation between the crack rate and dissipated energy for predicting the fatigue crack growth.