Evaluation of viscoelastic non-isochoric plastic behavior of PBT and PA6

Yoshihiko Sato, Sayaka Masumizu, Kenichi Sakaue, Jun Koyanagi, Akio Ohtani, Takenobu Sakai

研究成果: Article査読


The present study investigates the non-isochoric plastic behavior of two thermoplastics, polybutylene terephthalate (PBT) and polyamide 6 (PA6). The uniaxial tensile tests under temperature-controlled conditions are performed and Poisson’s ratio and volumetric strain are evaluated through the measurement of the longitudinal and transverse strains by digital image correlation (DIC). In addition, a mechanical model consisting of a viscoelastic and a non-isochoric plastic model is implemented in finite element software and applied to simulate the mechanical behavior in the uniaxial tensile test. The test results of the both thermoplastics show that the Poisson’s ratio during plastic deformation is less than 0.5. Compared to the test result with the finite element analysis, it is found that the variation of the volumetric strain is in good agreement with the finite element analysis assuming non-isochoric plasticity. These facts mean that the plastic behavior of PBT and PA6 is non-isochoric.

ジャーナルMechanics of Time-Dependent Materials
出版ステータスPublished - 2023 9月

ASJC Scopus subject areas

  • 化学工学一般
  • 材料科学一般
  • 航空宇宙工学
  • 機械工学


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