복합재료 동력전달축의 접착조인트에 관한 연구

A Study on Adhesive Joints for Composite Driveshafts

  • 발행 : 2001.04.01

초록

비강성, 비강도가 우수한 복합재료의 특성상, 기존의 금속 구조물을 복합재료 구조물로 대체 하는 것은 많은 이득을 가져온다. 이 논문에서는 탄소섬유/에폭시 복합재료와 유리섬유/에폭시 복합재료를 이용하여 정적 토크전달 능력, 비틀림 좌굴 하중. 굽힘 1차 고유진동수의 설계 기준을 만족하는 후륜구동 자동차용 일체형 동력전달축이 설계 및 제조되었다. 복합재료 중공축과 알루미늄 요크와의 결합을 위하여 단일 겹치기 접착조인트가 사용되었으며, 접착조인트의 정적 토크전달 능력은 접착길이와 요크두게에 따라 유한요소 해석을 이용하여 계산되었고, 실제 실험결과와 비교되었다. 복합재료 중공축의 정적 토크전달 능력은 Tasi-Wu 파괴지수와 아루미늄 요크와 에폭시 접착제의 비선형 물성을 적용하여 계산되었다. 실험과 해석결과로부터 복합재료 동력전달축의 정적 토크전달 능력은 임계 요크 두께에서 가장 높았으며, 임계 접착길이 이상에서는 포화되었다. 또한 일체형 복합재료 동력전달축은 기존의 2단 분리형 강철 동력전달축과 비교하여 40%의 무게 감소효과를 가져왔다.

Substituting composite structures for conventional metallic structures has many advantages because of higher specific stiffness and specific strength of composite materials. In this work, one-piece driveshafts composed of carbon/epoxy and glass/epoxy composites were designed and manufactured for a rear wheel drive automobile satisfying three design specifications, such as static torque transmission capability, torsional buckling and the fundamental natural bending frequency. Single lap adhesive joint was used to join the composite shaft and the aluminum yoke. The torque transmission capability of the adhesively bonded composite shaft was calculated with respect to bonding length and yoke thickness by finite element analysis and compared with the experimental result. Torque transmission capability was based on the Tsai-Wu failure index fur composite shaft and the failure model which incorporated the nonlinear mechanical behavior of aluminum yoke and epoxy adhesive. From the experiments and the finite element analyses, it was found that the static torque transmission capability of the composite driveshaft was highest at the critical yoke thickness, and saturated beyond the critical length. Also, it was found that the one-piece composite driveshaft had 40% weight saving effect compared with a conventional two-piece steel driveshaft.

키워드

참고문헌

  1. Robotica v.9 Manufacturing of a SCARA-type direct-drive robot with graphite/epoxy composite materials Lee, D. G.;Kim, K. S.;Kwak, Y. K.
  2. The ASME winter annual meetin. Composite Materials in the Automobile Industry Kulkarni, S. V.;Zweben, C. H.;Pipes, R. B.
  3. Universal Joints and Driveshafts Schmelz, F.;Seherr-Thoss, C.;Aucktor, E.
  4. The Automotive Chassis Reimpell, J.;Stoll, H.
  5. Composite Materials Technology Mallick, P. K.;Newman, S.
  6. Composite Structures v.38 Manufacturing of one-piece automotive dirveshafts with aluminum and composite materials Cho, D. H.;Lee, D. G.;Choi, J. H.
  7. Introduction to Design and Analysis with Advanced Composite material Swanson, S. R.
  8. 복합재료 역학 및 제조 기술 이대길;정광섭;최진호
  9. Journal of Adhesion Science and Technology v.14 The effects of surface roughness and bond thickness on the fatigue life of adhesively bonded tubular single lap joints Kwon, J. W.;Lee, D. G.
  10. Journal of Adhesion v.65 Influence of fabrication residual thermal stresses on adhesively bonded tubular single lap steel-steel joints under tensile load Kim, Y. G.;Lee, D. G.
  11. Journal of Adhesion v.50 Optimal design of the adhesively bonded tubular single lap joint Lee, S. J.;Lee, D. G.
  12. Principles of Composite Material Mechanics Gibson, R. F.
  13. Metal Forming Mechanics and Metallurgy Hosford, W. F.;Caddell, R. M.
  14. Journal of Adhesion Science and Technology v.14 Optimum design of co-curd steel-composite tubular single lap joints under axial load Cho, D. H.;Lee, D. G.
  15. Journal of Adhesion v.35 An experimental study of fatigue strength for adhesively bonded tubular single lap joints Lee, D. G.;Kim, K. S.;Im, Y. T.