Chinese Journal of Applied Chemistry ›› 2020, Vol. 37 ›› Issue (2): 190-197.DOI: 10.11944/j.issn.1000-0518.2020.02.190238

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Finite Element Analysis of Mechanical Properties of Polyimide Fiber under Thermal Field

LIU Danfengab,DING Mingmingb,ZAHNG Liliac,SUN Zhaoyanab,SHI Tongfeiab*(),HUANG Yinengac*()   

  1. aXinjiang Laboratory of Phase Transitions and Microstructures in Condensed Matter Physics,College of Physical Science and Technology,Yili Normal University,Yining,Xinjiang 835000,China
    bState Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China
    cSchool of Physics,National Lab of Solid State Microstructures,Nanjing University,Nanjing 210093,China
  • Received:2019-09-06 Accepted:2019-11-12 Published:2020-02-01 Online:2020-02-06
  • Contact: SHI Tongfei,HUANG Yineng
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21647114)

Abstract:

Using COMSOL Multiphysics 5.3 package, we establish a three-dimensional finite element model to calculate the mechanical properties of polyimide fibers with the temperature field generated by the solid heat transfer and surface radiation heat transfer. We analyze the effects of the size and location of holes and the difference of thermal expansion coefficient on the mechanical properties of polyimide fibers. The results indicate that under the condition of polyimide fiber with fixed constraints at both ends, the stress exhibits the similar trends in the temperature fields generated by solid heat transfer and surface radiation heat transfer. The holes in the polyimide fiber reduce the mechanical properties, which results in the larger holes corresponding to the more unbalanced stress distribution. This is more unfavorable to the stability of the polyimide fibers. Meanwhile, the stress decreases with the increase of negative axial coefficient of thermal expansion.

Key words: polyimide fiber, finite element analysis, stress