Evaluation of viscoelastic-viscoplastic characteristics and finite element analyses for thermoplastics

Haruki Takaoka, Kenichi Sakaue

研究成果: Article

抜粋

Thermoplastics are viscoelastic-viscoplastic materials whose mechanical behavior depends on temperature and strain rate. In this study, the viscoelastic-viscoplastic characteristics of polybutylene terephthalate (PBT) are evaluated on the basis of the mechanical model consisting of Schapery nonlinear viscoelasticity and Perzyna viscoplasticity. Also, the viscoelastic-viscoplastic behavior of the PBT is predicted by finite element simulation. The evaluation reveals that the initial yield stress depends on temperature and strain rate; however, viscosity depends on only strain rate. Furthermore, the rate sensitivity is independent of temperature and strain rate. The finite element simulation using identified viscoelastic-viscoplastic characteristics can reproduce the stress–strain relationship in the uniaxial tensile tests under various testing conditions. It is expected that the time-temperature superposition principle can be applied to not only the maximum stress but also the initial yield stress.

元の言語English
ジャーナルAdvanced Composite Materials
DOI
出版物ステータスAccepted/In press - 2019 1 1

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ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering

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