The dissertation is on the measurement of the strain caused by the characteristics and the temperature changes of the TIG welded zone which is used with 3D ESPI system that is functionally modified through the laser ESPI system. Experimental results have derived from the fact that the welded zone has micro crack during the various phased of the process such as rolling, alkali cleaning, air cooling and heat processing due to the repetitious up-and-down of the temperature. Especially, both 60℃ and 90℃ are selected to measure the strain on the welded zone which can be effected by these two temperatures in the manufacturing process. The flat plate differences between ESPI and the strain gage are within 2 %, and they are the exactly same with the results from the temperature changes of 60 ℃ and 90 ℃, and also within 3 % and 4 %. As the tensile load increase, the strain of aluminum material increases linearly. Also the same effect are observed as the temperature goes up with irregular-line type. The comparison of the strain by ESPI and the strain gage in the welded specimen is within the 2.6% when it is under the room temperature and low-load conditions, while it is measured within 3 % under the high load condition.

Abstract
 1. 서론
 2. 실험모델
 3. 온도변화에 따른 면내변위 측정
  3.1 ESPI와 스트레인 게이지에 의한 평판의 스트레인 비교
  3.2 ESPI와 스트레인 게이지에 의한 용접부의스트레인 비교
  3.3 온도변화에 따른 용접부의 면외변위 측정
 4. 결론
 후기
 References

• 성백섭(조선대학교 기계공학과) | B. S. Sung
• 유관종(조선대학교 산학협력선도대학(LINC)) | K. J. Yu Corresponding Author