Mechanics of Time-Dependent Materials

, Volume 16, Issue 3, pp 241–249 | Cite as

Estimating the creep behavior of polycarbonate with changes in temperature and aging time

  • Takenobu SakaiEmail author
  • Satoshi Somiya


Thermoplastic resins are typically used without any kind of physical aging treatment. For such materials, creep behavior and physical aging, which depend on time and temperature, occur simultaneously. The effects of these processes are evident after quenching and are recorded in the material as a thermal history. This history strongly influences mechanical properties and creep behavior in particular. Thus, a more thorough understanding of the physical aging process is desirable. We examined the creep deformation of polycarbonate (PC) to reveal the effects of physical aging on creep behavior. The effects were dependent on both time and temperature. The relationship between physical aging and creep behavior exemplified superposition principles with regard to time and both pre-test aging time and pre-test aging temperature. The superposition principles allowed the calculation of creep deformations at a given temperature; the calculated results were corroborated by experimental data.


Polycarbonate Creep Physical aging Thermo-plastics Linear viscoelastic theory Thermal history 


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© Springer Science+Business Media, B. V. 2011

Authors and Affiliations

  1. 1.Faculty of EngineeringTokyo Metropolitan UniversityTokyoJapan
  2. 2.Faculty of Science and TechnologyKeio UniversityYokohamaJapan

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