Elastomers and Composites

  • 제40권2호
  • /
  • Pages.119-127
  • /
  • 2005
  • /
  • 2092-9676(pISSN)
  • /
  • 2288-7725(eISSN)
한국고무학회 (The Rubber Society of Korea)
권호 표지

열 노화에 따른 NBR과 EPDM 가황물의 물성변화 및 노화수명 예측

Effects of Thermal Aging on Properties and Life-time Prediction of NBR and EPDM Vulcanizates

  • 우창수 (한국기계연구원 마이크로응용역학연구실) ;
  • 최성신 (세종대학교 응용화학과)
  • Woo, C.S. (Micro Applied Mechanics Lab., Korea Institute of Machinery & Materials) ;
  • Choi, S.S. (Dept. of Applied Chemistry, Sejong University)
  • 발행 : 2005.06.30
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

고무부품의 신뢰성을 확보하기 위해서 고무재료의 물성파악과 수명평가는 매우 중요하다 하겠다. 본 연구에서는 냉장고 콤프레샤 모터에서 발생되는 소음 및 진동 제어 목적으로 고무마운트에 사용되는 고무재료인 NBR과 EPDM에 대해 상온과 $70^{\circ}C,\;85^{\circ}C,\;100^{\circ}C$에서 75일 동안 노화시킨 상태에서 단축 인장과 이축 인장으로 물성시험을 수행하여 가교밀도, 100% 모듈러스 변화와 응력-변형률 관계를 파악하였다. 또한, 고무소재의 노화수명을 예측하기 위해 가속열 노화시험을 수행하여 시간-온도 환산식인 아레니우스 관계식을 구하였다.

Material characteristics and lifetime evaluation are very important in design procedure to assure the safety and reliability of the rubber components. In this paper, the material test and accelerated heat aging test were carried out to predict the useful life of NBR and EPDM rubber mount for a compression motor which is used in a refrigerator. In order to investigate the effects of heat-aging on the material properties, crosslink density, modulus at 100% strain, stress-strain curves were obtained from uniaxial and equi-biaxial tensile tests. The change of compression set were used for assessment of the useful life and the time to threshold value were plotted against the reciprocal of absolute temperature to give the Arrhenius plot. The useful life at variable temperatures are obtained in the Arrhenius relationship.

키워드

참고문헌

  1. A. N. Gent, 'Engineering with Rubber', Hanser Publisher Ltd., 1998
  2. A. J. Tomas, 'The Development of Fracture Mechanics for Elastomers', Rubber Chem. & Tech., 67, 50 (1994)
  3. K. Miller, 'Structural testing of Materials for Finite Element Analysis of Elastomeric Parts', Automotive Elastomers Conference, 2002
  4. L. Mullins, 'Softening of Rubber by Deformation', Rubber Chem. & Tech., 42, 339 (1969)
  5. R. S. Rivlin and D. W. Saunders, 'Large Elastic Deformations of Isotropic Materials - VII. Experiments on the Deformation of Rubber', Philos. Trans. R. Soc. (A), 243, 251 (1951)
  6. R. W. Ogden, 'Large Deformation of Isotropic Elasticity: on the Correlation of Theory and Experiment for Incompressible Rubberlike Solids', Proc. of the Royal Society(A), 326, 565 (1972)
  7. W. D. Kim and C. S. Woo, 'A Study on the Equi-biaxial Tension Test of Rubber Material', Trans. of KSAE, 11(5), 95 (2003)
  8. G. L. Bradley and P. C. Chang, 'Rubber Modeling Using Uniaxial Test data'. J. of App. Poly. Sci., 81, 837 (2001) https://doi.org/10.1002/app.1407
  9. R. P. Brown, T. Burtler, and S. W. Hawley, 'Ageing of Rubber-Accelerated Heat Ageing Test Results', RAPRA Technology, 2001
  10. R. P. Brown, 'Practical Guide to the Assessment of the Useful Life of Rubbers', RAPRA Technology, 2001