In the automobile industry, there is a push to maximize the mileage of electric vehicles by using lightweight materials. Hence, the use of welded aluminum in electric vehicles is increasing, and there is a clear need for detailed characterization of the fatigue life of these welded parts. In this study, gas metal arc welded AA6061-T6 specimens were fabricated and an ultrasonic fatigue test method for ultra-high cycle fatigue testing was proposed. An S-N fatigue test curve of 109 cycles was obtained, with an infinite life (109 cycles) confirmed at 118 MPa and 105 cycle level fatigue life confirmed at 216 MPa.
This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No.20206410100080) and also supported by the Ajou University research fund.
