• DOI:10.1007/S11771-007-0271-1
• Corpus ID: 136679308

Time-stress equivalence: Application to nonlinear creep of polypropylene

@article{Luo2007TimestressEA,
  title={Time-stress equivalence: Application to nonlinear creep of polypropylene},
  author={Wenbo Luo and Chuhong Wang and T. Vu-khanh and Said Jazouli},
  journal={Journal of Central South University of Technology},
  year={2007},
  volume={14},
  pages={310-313}
}

• W. Luo, Chuhong Wang, +1 author Said Jazouli
• Published 1 February 2007
• Materials Science, Engineering
• Journal of Central South University of Technology

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.