원문정보
초록
영어
This study presents a comprehensive procedure for the low cycle fatigue test of ultrasonically welded (UW) coated conductor (CC) lap-joints. The entire process is examined in detail, from the robust fabrication of the UW REBCO CC joints to the reliability testing under a low number of repeated cycle fatigue conditions. A continuous Ic measurement system enables real-time monitoring of Ic variations throughout the fatigue tests. The study aims to provide a step-by-step procedure that involves joint fabrication, electromechanical property (EMP) tests under uniaxial tension for stress level determination, and subsequent low-cycle fatigue tests. The joints are fabricated using a hybrid method that combines UW with adding In-Sn soldering, achieving a flux-free hybrid welding approach (UW-HW flux-free). The selected conditions for the low cycle fatigue tests include a stress ratio of R=0.1 and a frequency of 0.02 Hz. The results reveal some insights into the fatigue behavior, irreversible changes, and cumulative damage in the CC joints.
목차
1. INTRODUCTION
2. EXPERIMENTAL PROCEDURES
2.1. CC tape sample
2.2. Ultrasonic welding setup and electrical property measurement
3. EXPERIMENTAL RESULTS
3.1. Continuous Ic measurement results through tensiletest for EMP evaluation of CC lap-joints
3.2. Low-cycle fatigue test results at different stress levels
4. SUMMARY
ACKNOWLEDGMENT
REFERENCES