Time-stress equivalence: Application to nonlinear creep of polypropylene

  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},
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… 

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