Damping properties of pre-stressed shape-memory polymer sandwich beam

Tomohisa Kojima, Daigo Sato, Mitsuo Notomi

Research output: Contribution to journalArticlepeer-review


Recently, the development of damping materials has attracted attention to the field of vibration suppression. In this study, a pre-stressed composite sandwich beam was made using aluminium plates and polyurethane-based shape-memory polymer (SMP) with high damping capacity at temperatures near the glass transition point as the core material. Then, viscoelasticity measurements were carried out. It was found that, by sandwiching the SMP with aluminium plates, it may be possible to guarantee a higher stiffness than the vibration isolating rubber in the whole temperature range by a factor of at least 100. Furthermore, the sandwich composite specimen may achieve a value equivalent to or better than the loss factor of the vibration isolating rubbers at a temperature near the glass transition point of the SMP. It was also implied that the loss factor of the sandwich composite beam could be improved by pre-applying tensile stresses to the SMP.

Original languageEnglish
Pages (from-to)78-92
Number of pages15
JournalInternational Journal of Materials and Product Technology
Issue number1
Publication statusPublished - 2022


  • Composite structure
  • Damping
  • Functional materials
  • Loss factor
  • Sandwich beam
  • Shape-memory polymer
  • SMP
  • Viscoelasticity


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