Activities per year
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 |
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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 | |
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) |
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Country/Territory | 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
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Dive into the research topics of 'Characterization of variable stiffness joints for adaptive structures'. Together they form a unique fingerprint.Activities
- 1 Conference
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7th International Conference on Structural Engineering, Mechanics and Computation (SEMC 2019)
Qinyu Wang (Participant) & Alphose Zingoni (Organiser)
2 Sep 2019 → 4 Sep 2019Activity: Participating in or organising an event types › Conference › Scientific