Characterization of variable stiffness joints for adaptive structures

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

doi:10.1201/9780429426506-182

Characterization of variable stiffness joints for adaptive structures

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

Innovative Structural Design

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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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 language	English
Title of host publication	Advances in Engineering Materials, Structures and Systems: Innovations, Mechanics and Applications
Subtitle of host publication	Proceedings of the 7th International Conference on Structural Engineering, Mechanics and Computation (SEMC 2019), September 2-4, 2019, Cape Town, South Africa
Editors	Alphose Zingoni
Publisher	CRC Press
Pages	1045-1050
Number of pages	6
ISBN (Electronic)	9780429426506
ISBN (Print)	9781138386969
DOIs	https://doi.org/10.1201/9780429426506-182
Publication status	Published - 22 Aug 2019
Event	7th International Conference on Structural Engineering, Mechanics and Computation (SEMC 2019) - Cape Town, South Africa Duration: 2 Sep 2019 → 4 Sep 2019

Conference

Conference	7th International Conference on Structural Engineering, Mechanics and Computation (SEMC 2019)
Country	South Africa
City	Cape Town
Period	2/09/19 → 4/09/19

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

Access to Document

10.1201/9780429426506-182

Fingerprint Dive into the research topics of 'Characterization of variable stiffness joints for adaptive structures'. Together they form a unique fingerprint.

1 Conference

7th International Conference on Structural Engineering, Mechanics and Computation (SEMC 2019)
Qinyu Wang (Participant) & Alphose Zingoni (Organiser)
2 Sep 2019 → 4 Sep 2019
Activity: Participating in or organising an event types › Conference › Scientific

Cite this

Wang, Q., Teuffel, P., Habraken, A. P. H. W., Jansen, K., & Senatore, G. (2019). Characterization of variable stiffness joints for adaptive structures. In A. Zingoni (Ed.), Advances in Engineering Materials, Structures and Systems: Innovations, Mechanics and Applications: Proceedings of the 7th International Conference on Structural Engineering, Mechanics and Computation (SEMC 2019), September 2-4, 2019, Cape Town, South Africa (pp. 1045-1050). CRC Press. https://doi.org/10.1201/9780429426506-182

Wang, Qinyu ; Teuffel, Patrick ; Habraken, Arjan P.H.W. ; Jansen, Kaspar ; Senatore, Gennaro. / Characterization of variable stiffness joints for adaptive structures. Advances in Engineering Materials, Structures and Systems: Innovations, Mechanics and Applications: Proceedings of the 7th International Conference on Structural Engineering, Mechanics and Computation (SEMC 2019), September 2-4, 2019, Cape Town, South Africa. editor / Alphose Zingoni. CRC Press, 2019. pp. 1045-1050

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title = "Characterization of variable stiffness joints for adaptive structures",

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 {\textquoteleft}locked{\textquoteright} (e.g. a moment connection) and a {\textquoteleft}released{\textquoteright} (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.",

keywords = "Adaptive structures, Variable stiffness joint, Natural frequency shift, Dynamics and control, Viscoelastic material, 3D printing",

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Wang, Q , Teuffel, P , Habraken, APHW, Jansen, K & Senatore, G 2019, Characterization of variable stiffness joints for adaptive structures. in A Zingoni (ed.), Advances in Engineering Materials, Structures and Systems: Innovations, Mechanics and Applications: Proceedings of the 7th International Conference on Structural Engineering, Mechanics and Computation (SEMC 2019), September 2-4, 2019, Cape Town, South Africa. CRC Press, pp. 1045-1050, 7th International Conference on Structural Engineering, Mechanics and Computation (SEMC 2019), Cape Town, South Africa, 2/09/19. https://doi.org/10.1201/9780429426506-182

Characterization of variable stiffness joints for adaptive structures. / Wang, Qinyu ; Teuffel, Patrick ; Habraken, Arjan P.H.W.; Jansen, Kaspar; Senatore, Gennaro.

Advances in Engineering Materials, Structures and Systems: Innovations, Mechanics and Applications: Proceedings of the 7th International Conference on Structural Engineering, Mechanics and Computation (SEMC 2019), September 2-4, 2019, Cape Town, South Africa. ed. / Alphose Zingoni. CRC Press, 2019. p. 1045-1050.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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N2 - 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.

AB - 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.

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Wang Q , Teuffel P , Habraken APHW, Jansen K, Senatore G. Characterization of variable stiffness joints for adaptive structures. In Zingoni A, editor, Advances in Engineering Materials, Structures and Systems: Innovations, Mechanics and Applications: Proceedings of the 7th International Conference on Structural Engineering, Mechanics and Computation (SEMC 2019), September 2-4, 2019, Cape Town, South Africa. CRC Press. 2019. p. 1045-1050 https://doi.org/10.1201/9780429426506-182