International Journal of Precision Engineering and Manufacturing

  • 제9권4호
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  • Pages.57-62
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  • 2008
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  • 2234-7593(pISSN)
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  • 2005-4602(eISSN)
한국정밀공학회 (Korean Society for Precision Engineering)
권호 표지

Fatigue Properties of Copper Foil and the Evolution of Surface Roughness

  • Oh, Chung-Seog (School of Mechanical Engineering, Kumoh National Institute of Technology) ;
  • Bae, Jong-Sung (School of Mechanical Engineering, Kumoh National Institute of Technology) ;
  • Lee, Hak-Joo (Nano-Mechanical Research Division, Korea Institute of Mechinery and Materials)
  • 발행 : 2008.10.01
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초록

The aim of this investigation was to extract the fatigue properties at the designated fatigue life of copper foil and observe the mean stress and stress amplitude effects on both the fatigue life and the corresponding surface morphology. Tensile tests were performed to determine the baseline monotonic material properties of the proportional limit and ultimate tensile strength. Constant amplitude fatigue tests were carried out using a feedback-controlled fatigue testing machine. The mean stress and the stress amplitude were changed to obtain the complete nominal stress-life curves. An atomic force microscope was utilized to observe the relationship between the fatigue damage and the corresponding changes in surface morphology. A Basquin's exponent of-0.071 was obtained through the fatigue tests. An endurance limit of 122 MPa was inferred from a Haigh diagram. The specimen surface became rougher as the number of fatigue cycles increased, and there was a close relationship between the fatigue damage and the surface roughness evolution.

키워드

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