Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Tensile Tests for Copper Thin Foils by Using DIC Method

DIC 법을 이용한 구리박막의 인장시험

  • Kim, Chung Youb (Division of Mechanical and Automotive Engineering, Chonnam Nat'l Univ.) ;
  • Song, Ji Ho (Dept. of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Park, Kyung Jo (Division of Mechanical and Automotive Engineering, Chonnam Nat'l Univ.)
  • 김정엽 (전남대학교 기계자동차공학부) ;
  • 송지호 (한국과학기술원 기계공학부) ;
  • 박경조 (전남대학교 기계자동차공학부)
  • Received : 2012.07.19
  • Accepted : 2012.08.20
  • Published : 2012.12.01
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Abstract

In this study, tensile tests for 12-${\mu}m$-thick copper thin foils were performed by using the DIC method. The DIC method provided precise stress-strain curves for thin film materials, and a commercial inkjet printer can be simply and effectively used for printing speckle patterns on the specimen of Cu thin films whose surface contrast is too low to apply the DIC method. The mechanical properties of Cu thin foils obtained in this study are as follows: elastic modulus E = 89.2 GPa, 0.2% offset yield stress $S_{0.2%}$= 232.8 MPa, tensile strength $S_u$= 319.2 MPa, elongation at fracture ${\varepsilon}_f$=16.8 %, and Poisson's ratio ${\nu}$= 0.34.

본 연구에서는 DIC 법을 이용하여 두께 $12{\mu}m$ 의 구리박막에 대한 인장시험을 수행하였다. 시험결과 정밀한 응력-변형률 곡선의 시험결과를 얻을 수 있었으며, 특히 잉크젯프린터를 이용한 시험편 표면 스펙클패턴의 작성은 DIC 법을 적용하기가 어려운 시험편 표면의 콘트라스트가 낮은 경우에 유용하게 사용할 수 있을 것이다. 측정된 구리박막의 기계적 물성은 탄성계수 E = 89.2 GPa, 0.2% 오프셋 항복응력 $S_{0.2%}$= 232.8 MPa, 인장강도 $S_u$= 319.2 MPa, 파단연신률 ${\varepsilon}_f$= 16.8 %, Poisson 비 ${\nu}$= 0.34 의 결과를 얻었으며, 탄성계수는 알려진 벌크소재에 대한 결과보다는 작다.

Keywords

References

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