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Time-stress equivalence: Application to nonlinear creep of polypropylene

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Abstract

Stress induced change in intrinsic time scale was investigated by nonlinear creep tests of polypropylene (PP) at room temperature of 27 °C. The time-dependent axial elongations of the specimen were measured at 5 different stress levels, from 10.2 to 20 MPa, and modeled according to the time-stress superposition principle. The test duration was only 1 h. The test results show that the creep compliance vs logarithm time curves at different stresses depart from each other, indicating nonlinear viscoelastic behavior, and can be horizontally shifted to overlap onto a smooth master curve up to 51.5 h at the reference stress of 10.2 MPa. It is demonstrated that the time-stress superposition principle provides an accelerated test technique to evaluate the materials’ long-term mechanical properties.

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Authors and Affiliations

  1. College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan, 411105, China

    Luo Wen-bo  (罗文波) & Wang Chu-hong  (王初红)

  2. Key Laboratory of Low Dimensional Materials and Application Technology, Xiangtan University, Ministry of Education, China

    Luo Wen-bo  (罗文波)

  3. Department of Mechanical Engineering, École de Technologie Supérieure, 1100, Notre-Dame Street West, Montreal, Quebec, H3C 1K3, Canada

    Vu-Khanh Toan & Jazouli Said

Authors
  1. Luo Wen-bo  (罗文波)
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  2. Wang Chu-hong  (王初红)
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  3. Vu-Khanh Toan
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  4. Jazouli Said
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Corresponding author

Correspondence to Luo Wen-bo  (罗文波).

Additional information

Foundation item: Project(10572123) supported by the National Natural Science Foundation of China; Project(KF0502) supported by the Key Laboratory of Low Dimensional Materials and Application Technology of Xiangtan University, Ministry of Education, China

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Luo, Wb., Wang, Ch., Vu-Khanh, T. et al. Time-stress equivalence: Application to nonlinear creep of polypropylene. J Cent. South Univ. Technol. 14 (Suppl 1), 310–313 (2007). https://doi.org/10.1007/s11771-007-0271-1

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  • DOI: https://doi.org/10.1007/s11771-007-0271-1

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