Experimental Procedure for Energy Dissipation Estimation during High-Cycle Fatigue Loading of Metallic Material

摘要

The fatigue failure process of metal is a complex energy exchange process accompanied by temperature evolution due to energy dissipation and heat transfer, which can be well recorded by infrared thermography. With the development and popularization of infrared thermography, many energy dissipation estimation methods have been proposed. In this work, three types of energy dissipation estimation methods in different time periods during the high-cycle fatigue experiment are derived and improved. The energy dissipations of FV520B stainless steel specimens (which are subjected to different heat treatments) during fatigue cyclic loading are estimated with the different derived methods and compared. The assumptions for thermal loss may be the main reason for error in the different methods. The energy dissipations estimated by the different methods have basically the same overall trend. Finally, some suggestions on high-cycle fatigue experimental procedures for energy dissipation estimation are proposed.