Characterization of variable stiffness joints for adaptive structures

Qinyu Wang, Patrick Teuffel, Arjan P.H.W. Habraken, Kaspar Jansen, Gennaro Senatore

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Abstract

This paper presents a new strategy to control the structure dynamic response via a shift of the natural frequencies obtained through using variable stiffness joints. The joints are made of shape memory pol-ymers and are fabricated through 3D printing. Stiffness variation is activated through resistive heating which causes a phase change from a glassy to a rubbery state in order to switch the joint between a ‘locked’ (e.g. a moment connection) and a ‘released’ (e.g. pin) state. This work comprises an experimental and a numerical part: 1) dynamic mechanical thermal analysis (DMTA) has been carried out to characterize the viscoelastic behavior of a 3D printed SMP specimen; 2) the dynamic response of a 2-floor planar frame equipped with four variable stiffness SMP joints is simulated through transient analysis. Numerical results show that through joint stiffness control, the fundamental frequency shifts up to 19% causing a drastic reduction of the dynamic re-sponse under resonance loading. A comparison between variable stiffness joints with viscoelastic and only-elastic behavior shows that viscoelasticity increases mechanical damping up to 4.7 times during the transition phase.
Original languageEnglish
Title of host publicationAdvances in Engineering Materials, Structures and Systems: Innovations, Mechanics and Applications
Subtitle of host publicationProceedings of the 7th International Conference on Structural Engineering, Mechanics and Computation (SEMC 2019), September 2-4, 2019, Cape Town, South Africa
EditorsAlphose Zingoni
PublisherCRC Press
Pages1045-1050
Number of pages6
ISBN (Electronic)9780429426506
ISBN (Print)9781138386969
DOIs
Publication statusPublished - 22 Aug 2019
Event7th International Conference on Structural Engineering, Mechanics and Computation (SEMC 2019) - Cape Town, South Africa
Duration: 2 Sep 20194 Sep 2019

Conference

Conference7th International Conference on Structural Engineering, Mechanics and Computation (SEMC 2019)
CountrySouth Africa
CityCape Town
Period2/09/194/09/19

Keywords

  • Adaptive structures
  • Variable stiffness joint
  • Natural frequency shift
  • Dynamics and control
  • Viscoelastic material
  • 3D printing

Promotion : time and place

  • September 2-4, 2019, Cape Town, South Africa

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