Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

An Evaluation of Probabilistic Strain-Life Curve in Polyacetal

폴리아세탈 소재의 확률론적 변형률-수명선도 평가

  • 장천수 (한양대학교 기계공학과) ;
  • 김철수 (한국철도대학 철도차량기계과) ;
  • 박범규 (현대.기아자동차 연구개발본부) ;
  • 김정규 (한양대학교 기계공학과)
  • Published : 2006.11.01
Download PDF
⟨ Previous Next ⟩

Abstract

In order to evaluate variation of fatigue life of mechanical components including engineering plastics, it is important to estimate probabilistic strain-life curves to accurately define the variation of fatigue characteristics. This paper intends to provide new assessment of P-$\varepsilon$-N (probabilistic strain-life curves) for considering the variation of fatigue characteristics in polyacetal. The fatigue strain controlled tests were conducted under constant 50% humidity and room temperature condition by a universal testing machine at strain ratio, R=0. A practical procedure is introduced to evaluate probabilistic strain-life curves. Three probabilistic distributions were used for generating P-$\varepsilon$-N curves such as normal, 2-parameter and 3-parameter Weibull. In this study, 3-parameter Weibull distribution was found to be most appropriate among assumed distributions when the probability distributions of the fatigue characteristic were examined using chi-square and Kolmogorov-Smirnov test. The more appropriate P-$\varepsilon$-N curves for these materials are generated by the proposed method considering 3-parameter Weibull distribution.

Keywords

References

  1. Min, B. K., 1987, 'Engineering Plastic(EP),' Chemical Engineering and Technology, Vol. 5, No. 1, pp. 10-16
  2. Lim, Y. S., 1996, 'Engineering Plastic for Automotive Parts,' Korean Society of industrial and Engineering Chemistry, Polymer Symposium, pp. 1-19
  3. Cho, G. G., Je, D. K. and Lim, J. T., 1998, ' Plastic Technology for Lightness of Automobile Parts,' Korea institute of industrial Engineers/The Korean Operations and Management Science ？Society, 98' Spring Association Conference, pp. 1-5.
  4. Underwood, G. S., 2002, 'Wear Performance of Ultra-Performance Engineering Polymers at High PVs,' Society of Automotive Engineers, 02' SAE World Congress, 2002-01-0600
  5. Blanco, A., 2003, 'Plastics Failure Analysis and Prevention,' Society of Plastics Engineers , Vol. 59, Iss.8
  6. Parrington, R. J , 2000, 'Fractography of metals and Plastics,' Engineering Brookfield Center, Vol. 56, Iss. 12; pp. 54-60
  7. Chowdhury, S. R. and Narasimhan, R., 2000, 'A Finite Element Analysis of Quasistatic Crack Growth in a Pressure Sensitive Constrained Ductile Layer,' Engineering Fracture Mechanics, Vol. 66, pp. 551-571 https://doi.org/10.1016/S0013-7944(00)00033-3
  8. Ramsteiner, F. and Armbrust, T., 2001, 'Fatigue Crack Growth in Polymers,' Polymer Testing, Vol. 20, pp. 321-327 https://doi.org/10.1016/S0142-9418(00)00039-8
  9. Li, X., Hristov, H. A., Yee, A. F. and Gidley, D. W., 1995, 'Influence of Cyclic Fatigue on The Mechanical Properties of Amorphous Polycarbonate,' Polymer, Vol. 36, No. 4, pp. 759-765. https://doi.org/10.1016/0032-3861(95)93105-U
  10. Xiaowei, Li, Hristo, A. H., Albert F. Y. and David, W. G., 1995, 'Influence of Cyclic Fatigue on the Mechanical Properties of Amorphous Polycarbonate,' Polymer, VoI.36, No.4, pp.759-765 https://doi.org/10.1016/0032-3861(95)93105-U
  11. Kim, C. H., Ahn, H. S., Chong, T. H., 2002, 'Experimental Study for Durability Enhancement of Plastic Spur Gear,' Trans. of the KSME, Vo1.26, No.29, pp. 1914-1922 https://doi.org/10.3795/KSME-A.2002.26.9.1914
  12. Kim, J. W., 1984, 'An Analysis of the Fracture Initiation of Falling Type Impact Test for Toughnened Rigid Plastics,' Trans. of the KSME, Vol.8, No.4, pp. 385-392
  13. Sugair, A. and Kiremidjian, F. H., 1990, 'Low-cycle Fatigue Data Statistical Analysis And Simulation,' Engineering Fracture Mechanics, Vol. 37, No.3, pp. 691-696 https://doi.org/10.1016/0013-7944(90)90393-U
  14. ASTM E739-91, 1998, Standard Practice for Statistical Analysis of Linear Or Linearized Stress-Life(S-N) and Strain-Iife(e-N) Fatigue data, pp. 631-637
  15. Baldwin, J. D. and Thacker, J. G, 1995, 'A Strain-Based Fatigue Reliability Analysis Method,' Journal of Mechanical Design, Vol. 117, pp. 229-234 https://doi.org/10.1115/1.2826127
  16. Williams, C. R., Lee, Y. L. and Rilly, J. T., 2003, 'A Practical Method for Statistical Analysis of Strain-Life Fatigue Data,' International Journal of Fatigue, Vol. 24, pp. 427-436 https://doi.org/10.1016/S0142-1123(02)00119-6
  17. Shen CL, Wirsching, PH, Cashman, GT, 1996,' Design Curve to Characterize Fatigue ？Strength,' Journal of Engineering Material Technology ASME, No. 118, pp. 535-541
  18. ASTM D638-03, 2003, Standard Test Method for Tensile Properties of Plastics, ASTM
  19. ASTM D695-02a, 2002, Standard Test Method for Compressive Properties of Rigid Plastics, ASTM
  20. Haldar, A. and Mahadevan, S., Probability, Reliability and Statistical Methods in Engineering design, John Wiley & Sons, pp.106-120