Study of Temperature Evolution Caused by Mesodefect Kinetics in Metals under Fatigue Loading

Abstract. The experimental investigation of thermal behavior of titanium alloys under cyclic loading based on infrared thermography (IR camera FLIR SC 5000 with thermal resolution up to 0.1 mK and maximum framing rate up to 500Hz) is carried out. The damage evolution during self-heating test and crack propagation under fatigue loading are studied. It is shown that grain size has a great influence on dissipation process in metals and submicrocrystalline grains qualitatively change the result of self-heating test. The application of IR technique to the fatigue crack propagation study allows us also to investigate the asymptotes of temperature distribution into fatigue crack tip and propose the algorithms to calculate the heat dissipation into crack tip and estimate stress intensity factor