In this study, Equivalent fracture strain and Fracture energy were evaluated with the small punch test(SP test) for friction stir welded(FSW) Al6061-T6 sheets. With the three rotation speeds and the three feeding rate, The nine different conditions of FSW were prepared for the SP test. The SP test specimens were manufactured and tested on the advancing side, center, and retreating side to the tool rotation direction. From the SP test data, the equivalent fracture strain and the fracture energy were analyzed. The high value of equivalent fracture strain was attained form tool rotational speed 900RPM and feeding rate 330mm/min. It is found that its characteristic is about 14% higher than the value of condition 1100RPM-330mm/min that have the lowest value. The high value of fracture energy was obtained from the tool rotation speed 900RPM and feeding rate 330mm/min. The lowest fracture energy, which from 1000RPM-300mm/min, was approximately 16% difference to the highest value.

ABSTRACT
 1. 서론
 2. Al6061-T6에 대한 마찰교반용접
 3. Small Punch 시험
 4. 결과 및 고찰
  4.1 등가파괴변형률
  4.2 파괴에너지
 5. 결론
 References

• 송준혁(Korea Institute of Carbon Convergence Technology) | Joon-Hyuk Song Corresponding Author
• 문민석(Korea Institute of Carbon Convergence Technology) | Min-Seok Moon
• 오제하(Korea Institute of Carbon Convergence Technology) | Je-Ha Oh
• 양성모(Chonbuk National University Dept. of Mechanical System Engineering) | Sung-Mo Yang
• 유효선(Chonbuk National University Dept. of Mechanical System Engineering) | Hyo-Sun You
• 강희용(Chonbuk National University Dept. of Mechanical System Engineering) | Hee-Yong Kang
• 김은성(Vision College of Jeonju Dept. of Automated Machinery Engineering,) | Eun-Sung Kim