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

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

DOI QR Code

Time-Temperature Superposition Behavior for Accelerated Fatigue Lifetime Testing of Polycarbonate(PC)

폴리카보네이트(PC)의 가속 피로수명 시험을 위한 시간-온도 호환성

  • 김규호 (공군사관학교 교수부 기계공학과)
  • Published : 2006.08.01
Download PDF
⟨ Previous Next ⟩

Abstract

Time-temperature superposition has been studied to determine the long-term fatigue life over millions of cycles for glassy polymers. π le superposition is supposed to make an accelerated lifetime testing (ALT) technique possible. Dog-bone shaped specimens made of carbon filled Polycarbonate (PC) were tested under fatigue, based on the stress-lifetime approach (S-N curve). Fatigue-induced localized yield-like deformation is considered as the defect leading to fatigue and its evolution behavior is characterized by a modified energy activation model in which temperature is considered as fatigue acceleration factor. This model allows the reduced time concept to account for effects of different temperature in short-term fatigue data to determine long-term fatigue life through the use of time-temperature superposition that is applicable under a low frequency and isothermal conditions. The experimental results validated that the proposed technique could be a possible method for accelerated lifetime testing (ALT) of time-dependent polymeric materials.

Keywords

References

  1. Kim, W. G., Yoon, S. N., Ryu, W. S. and Yi, W., 2005, 'Creep-Life Prediction and Standard Error Analysis of Type 316LN Stainless Steel by Time-Temperature Parametric Methods,' Trans. of the KSME(A), Vol.29, No. 1, pp. 74-80 https://doi.org/10.3795/KSME-A.2005.29.1.074
  2. Painter, P. C., Colemen, M. M., 1997, Fundamentals of Polymer Science, Technomic Publishing Company, Inc. Pennsylvania
  3. Kozlov, G. V., Novikov, V. D., 2001, 'A Cluster Model for the Polymer Amorphous State,' Physics-Uspekhi, Vol. 44, No. 7, pp.681-724 https://doi.org/10.1070/PU2001v044n07ABEH000832
  4. Beardmore, P., Rabinowitz, S., 1974, 'Cyclic Deformation And Fracture in Polymer,' Applied Polymer Symposium, No. 24, pp. 25-29
  5. Argon, A. S., Bulatov, V. V., Mort, P. H., Suter, D. W., 1994, 'Plastic Deformation in Glassy Polymers by Atomistic and Mesoscopic Simulation,' Journal of Rheology, Vol. 39, No. 2, pp. 377-399 https://doi.org/10.1122/1.550728
  6. Kinloch, A. J., Young, R. J., 1983, Fracture behavior of polymers. Applied Science Publishers, London and New York
  7. Xiao, C., Tho, J. Y., Yee, A. F., 1994, 'Correlation Between the Shear Yielding Behavior and Secondary Relaxation of Bisphenol A Polycarbonate and Related Copolymers,' Marcromolecules, Vol. 27, pp. 2761-2768 https://doi.org/10.1021/ma00088a017
  8. Chau, C. C., Li, J. C. M., 1981, 'Fracture of Shear Bands in Atatic Polystyrene,' Journal of Materials Science, Vol. 16, pp. 1858-1873 https://doi.org/10.1007/BF00540634
  9. Kramer, E. J., 1975, 'The Growth of Shear Bands in Polystyrene,' Journal of Polymer Science and Polymer Physics, Vol. 13, pp. 509-525 https://doi.org/10.1002/pol.1975.180130305
  10. Yamamoto, T., Furukawa, R., 1995, 'Relationship Between Molecular Structure and Deformation-Fracture Mechanism of Amorphous Polymers; 2. Crazing stress,' Polymer, Vol. 36, pp. 2393-2396 https://doi.org/10.1016/0032-3861(95)97338-G
  11. Ishikawa, M., 1995, 'Stability of Plastic Deformation and Toughness of Polycarbonate Blended with Poly (Acrylonitride-Butadien-Styrene) Copolymer,' Polymer Vol. 36, pp. 2203-2210 https://doi.org/10.1016/0032-3861(95)95297-E
  12. Wang, B., Lu, R., Kim, G., 2002, 'A Damage Model for the Fatigue Life of Elastomeric Materials,' Journal of Mechanics of Materials, Vol. 34, No. 8, pp. 475-483 https://doi.org/10.1016/S0167-6636(02)00175-8
  13. Crawford, R. J., Benham, P. P., 1975, 'Some Fatigue Characteristics of Thermoplastics,' Polymer, Vol. 16, pp. 908-914 https://doi.org/10.1016/0032-3861(75)90212-8
  14. Miyano, Y., Nakada, M., Kudoh, R., Muki, R., 1999, 'Prediction of Tensile Fatigue Life Under Temperature Environment for Unidirection CFRP,' Advenced Composite Materials, Vol. 8, No. 3 pp. 235-246 https://doi.org/10.1163/156855199X00236
  15. Miyano, Y., Nakada, M., Kudoh, R., Muki, R., 2000, 'Determination of Tensile Fatigue Life of Unidirectional CFRP Specimens by Strand Testing,' Mechanics of Time-dependent Materials, Vol. 4 pp. 127-137 https://doi.org/10.1023/A:1009882709870
  16. Adam, G., Gibbs, J. R., 1965, 'On the Temperature Dependence of Cooperative Relaxation Properties in Glass Forming Liquids,' Journal of Chemical Physics, Vol. 43, pp. 139-146 https://doi.org/10.1063/1.1696442
  17. Knauss, W. G., Emri, I., 1981, 'Nonlinear Viscoelasticity Based on Free Volume Consideration,' Computer & Structures, Vol. 13, pp. 123-128 https://doi.org/10.1016/0045-7949(81)90116-4
  18. Takemori, M. T., Matsumoto, D. S., 1982, 'An Unusual Fatigue Crack-tip Plastic Zone: The Epsilon Plastic Zone of Polycarbonate,' Journal of Polymer Science and Polymer Physics Edition 20, pp. 2027-2040