NiTi-Polyimide Composites Prepared Using Thermal Imidization Process

  • D. Vokoun
  • P. Sysel
  • L. Heller
  • L. Kadeřávek
  • M. Svatuška
  • T. Goryczka
  • V. Kafka
  • P. Šittner


We manufactured NiTi plate-polyimide composite samples and analyzed their thermomechanical behavior. The residual stresses formed in the composite result from the shift of transformation temperatures and shape changes during thermal cycling. We demonstrate the use of finite element analysis for modeling the shape changes. The shape changes result from the difference in coefficients of thermal expansion and from the changes of Young’s modulus and of the coefficient of thermal expansion in the NiTi shape memory alloy.


actuator composite model NiTi polyimide residual stress 



This work has been supported by the Czech Science Foundation, within projects GA14-15264S and GC15-13174J.


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Copyright information

© ASM International 2016

Authors and Affiliations

  • D. Vokoun
    • 1
  • P. Sysel
    • 2
  • L. Heller
    • 1
  • L. Kadeřávek
    • 1
    • 3
  • M. Svatuška
    • 1
    • 4
  • T. Goryczka
    • 5
  • V. Kafka
    • 6
  • P. Šittner
    • 1
  1. 1.Institute of Physics of the Czech Academy of SciencesPragueCzech Republic
  2. 2.Department of PolymersUniversity of Chemistry and TechnologyPragueCzech Republic
  3. 3.Department of Materials, Faculty of Nuclear Sciences and Physical EngineeringCzech Technical University in PraguePragueCzech Republic
  4. 4.Faculty of Mathematics and PhysicsCharles University in PraguePragueCzech Republic
  5. 5.Institute of Materials ScienceUniversity of Silesia in KatowiceKatowicePoland
  6. 6.Institute of Theoretical and Applied Mechanics of the Czech Academy of SciencesPragueCzech Republic

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