Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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Fatigue Strength of Al-5052 Tensile-Shear Specimens using a SPR Joining Method

SPR 접합법을 이용한 Al-5052 인장-전단 시험편의 피로강도

  • Lee, Man Suk (Department of Automotive Engineering, Graduate School, Seoul National University of Science & Technology) ;
  • Kim, Taek Young (Department of Automotive Engineering, Graduate School, Seoul National University of Science & Technology) ;
  • Kang, Se Hyung (Department of Automotive Engineering, Graduate School, Seoul National University of Science & Technology) ;
  • Kim, Ho Kyung (Department of Mechanical & Automotive Engineering, Seoul National University of Science & Technology)
  • 이만석 (서울과학기술대학교 대학원 자동차공학과) ;
  • 김택영 (서울과학기술대학교 대학원 자동차공학과) ;
  • 강세형 (서울과학기술대학교 대학원 자동차공학과) ;
  • 김호경 (서울과학기술대학교 기계.자동차공학과)
  • Received : 2013.12.26
  • Accepted : 2014.06.30
  • Published : 2014.08.31
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Abstract

Self-piercing riveting(SPR) is a mechanical fastening technique which is put pressure on the rivet for joining the sheets. Unlike a spot welding, SPR joining does not make the harmful gas and $CO_2$ and needs less energy consumption. In this study, static and fatigue tests were conducted using tensile-shear specimens with Al-5052 plates for evaluation of fatigue strength of the SPR joints. During SPR joining process for the specimen, using the current sheet thickness and a rivet, the optimal applied punching force was found to be 21 kN. And, the maximum static strength of the specimen produced at the optimal punching force was 3430 N. During the fatigue tests for the specimens, interface failure mode occurred on the top substrate close to the rivet head in the most high-loading range region, but on the bottom substrate close to the rivet tail in the low -loading range region. There was a relationship between applied load amplitude $P_{amp}$ and lifetime of cycle N for the tensile-shear, $P_{amp}=3395.5{\times}N^{-0.078}$. Using the stress-strain curve of the Al-5052 from tensile test, the simulations for fatigue specimens have been carried out using the implicit finite element code ABAQUS. The relation between von-Mises equivalent stress amplitude and number of cycles was found to be ${\sigma}_{eq}=514.7{\times}N^{-0.033}$.

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