Fatigue Strength Evaluation of Adhesive Bonded and Mechanical Pressed Joints of Cold Rolled Steel Sheet

냉간압연강판 접착 및 기계적 프레스 접합부의 피로강도 평가

  • Received : 2009.07.24
  • Accepted : 2010.02.05
  • Published : 2010.02.28

Abstract

The tensile and fatigue experiments were conducted with tensile-shear specimens for investigating the strength of adhesive bonded and mechanical press joints of SPCC steel sheet used in the field of the automobile industry. The optimal punch press force was evaluated 50kN for combining epoxy adhesive bonding and mechanical press joining with a diameter of 8.3mm using SPCC sheet with a thickness of 0.8mm. The combining epoxy adhesive bonding and mechanical press joining exhibits the maximum tensile force of 750N. The fatigue strengths of the combination of adhesive bond and mechanical press joint and pure adhesive joint were evaluated 370N and 320N at 106cycles, respectively. These values correspond to 22% and 20% of their maximum tensile forces, respectively. However, the fatigue strength of the combination of adhesive bond and mechanical press joining was much lower than that of pure mechanical press joining.

Keywords

tensile-shear;adhesive bonding;mechanical press joining;fatigue strength

References

  1. 박우진, 박익민, 김낙준, "자동차용 경량금속재료의 개발동향", 한국자동차공학회지, 제16권, 제4 호, pp. 23-31, 1994.
  2. S. Gao, and L. Budde, "Mechanism of mechanical press joining", Int. J. Mach. Tools Manufact., Vol. 34, No. 5, pp. 641-657, 1994. https://doi.org/10.1016/0890-6955(94)90049-3
  3. J.K. Larsson, "Clinch joining A effective joining technique for body in white assembly", Advanced Technique & Processes, IBEC'94, pp. 140-145, 1994.
  4. 이원, 정의섭 "구조접착이음의 접합부 강도평가", 자동차공학회지, 제18권, 제3호, pp. 23-33, 1996.
  5. 정남용 "접착이음의 강도평가에 관한 연구," 대한기계학회논문집, 제16권, 제4호, pp. 667-674, 1992.
  6. M. Carboni, S. Beretta and M. Monno, "Fatigue behavior of tensile-shear loaded clinched joints", Eng.Fracture Mech. Vol. 73, No. 2, pp. 178-190, 2006. https://doi.org/10.1016/j.engfracmech.2005.04.004
  7. J.M. Sawhill and S.E Sawdon, "A new mechanical joining technique for steel compared with spot welding", SAE 830128, SAE Technical Paper Series, 1983.
  8. R. Davies, R. Pedreschi and B.P. Sinha., "The shear behavior of press-joining in cold-formed steel structures", Thin-Walled Structures, Vol. 25, No. 3, pp. 153-170, 1996. https://doi.org/10.1016/0263-8231(96)00004-3
  9. 최덕호, "냉간압연강판 기계적 프레스 접합부의 피로강도 평가", 서울산업대학원 석사학위논문, 2006.
  10. S. Gomez,, J. Onoro and J. Pecharroman, "A simple mechanical model of a structural hybrid adhesive/ riveted single lap joint", International Journal of Adhesion & Adhesives Vol. 27, No. 4, pp. 263-267, 2007. https://doi.org/10.1016/j.ijadhadh.2006.01.004