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Design and analysis of laminates for self-deployment of viscoelastic bi-stable tape springs after long-term stowage
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0001-6802-8331
(English)Manuscript (preprint) (Other (popular science, discussion, etc.))
Abstract [en]

Bi-stable tape springs are ultra-thin fiber-reinforced polymers composites, which could self-deploy through releasing stored strain energy. Strain energy relaxation is observed after long-term stowage of bi-stable tape springs due to viscoelastic effects and the tape springs might lose their self-deployment abilities. In order to mitigate the viscoelastic effects and thus ensure self-deployment, different tape springs were designed, manufactured and tested. Deployment experiments show that a 4-layer, [-45/0/90/45], plain weave glass fiber tape spring has ahigh capability to mitigate the strain energy relaxation effects to ensure self-deployment after long-term stowage in a coiled configuration. The two inner layers increase the deployment force and the outer layers are used to generate the bi-stability. The presented 4-layer tape spring can self-deploy after more than 6 months of stowage at room temperature. A numerical model was used to assess the long-term stowage effects on the deployment capability of bi-stable tape springs. The experiments and modeling results show that the viscoelastic strain energy relaxationstarts after only a few minutes after coiling. The relaxation shear stiffness decreases as the shear strain increases and is further reduced by strain energy relaxation when a constant shear strain is loaded. The numerical model and experiments could be applied in design to predict the deployment force of other types of tape springs with viscoelastic and friction effects included.

Keyword [en]
Bi-stable tape springs, fiber reinforced composites, viscoelastic effects, laminate, long-term stowage, deployment, coilable flexible structure, CubeSat, Space boom
National Category
Aerospace Engineering
Research subject
Materials Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-206552OAI: oai:DiVA.org:kth-206552DiVA: diva2:1093236
Projects
SEAM
Funder
EU, FP7, Seventh Framework Programme, 607197
Note

QC 20170508

Available from: 2017-05-05 Created: 2017-05-05 Last updated: 2017-05-23Bibliographically approved
In thesis
1. Numerical and Experimental Studies of Deployment Dynamics of Space Webs and CubeSat Booms
Open this publication in new window or tab >>Numerical and Experimental Studies of Deployment Dynamics of Space Webs and CubeSat Booms
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis, experiments and simulations are performed to study the deployment dynamics of space webs and space booms, focusing on the deployment and stabilization phases of the space web and the behavior of the bi-stable tape spring booms after long-term stowage.

The space web, Suaineadh, was launched onboard the sounding rocket REXUS-12 from the Swedish launch base Esrange in Kiruna on 19 March 2012. It served as a technology demonstrator for a space web. A reaction wheel was used to actively control the deployment and stabilization states of the 2×2 m2 space web. After ejection from the rocket, the web was deployed but entanglements occurred since the web did not start to deploy at the specified angular velocity. The deployment dynamics was reconstructed by simulations from the information recorded by inertial measurement units and cameras. Simulations show that if the web would have started to deploy at the specified angular velocity, the web would most likely have been deployed and stabilized in space by the motor, reaction wheel and controller used in the experiment. A modified control method was developed to stabilize the out-of-plane motions before or during deployment. New web arms with tape springs were proposed to avoid entanglements.

A deployable booms assembly composed of four 1-m long bi-stable glass fiber tape springs was designed for the electromagnetically clean 3U CubeSat Small Explorer for Advanced Missions (SEAM). The deployment dynamics and reliability of the SEAM boom design after long-term stowage were tested by on-ground experiments. A simple analytical model was developed to predict the deployment dynamics and to assess the effects of the GOLS and the combined effects of friction, viscoelastic strain energy relaxation, and other factors that act to decrease the deployment force. In order to mitigate the viscoelastic effects and thus ensure self-deployment, different tape springs were designed, manufactured and tested. A numerical model was used to assess the long-term stowage effects on the deployment capability of bi-stable tape springs including the friction, nonlinear-elastic and viscoelastic effects. A finite element method was used to model a meter-class fully coiled bi-stable tape spring boom and verified by analytical models.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. 54 p.
Series
TRITA-AVE, ISSN 1651-7660 ; TRITA-AVE 2017:28
Keyword
Deployable structure, Space web, Centrifugal force deployment, Deployable boom, Bi-stable tape spring, Fiber-reinforced composite, Viscoelasticity
National Category
Mechanical Engineering
Research subject
Aerospace Engineering
Identifiers
urn:nbn:se:kth:diva-206594 (URN)978-91-7729-399-6 (ISBN)
Public defence
2017-05-30, F3, Lindstedtsvägen 26, Kungl Tekniska högskolan, Stockholm, 13:00
Opponent
Supervisors
Projects
SEAM
Funder
EU, FP7, Seventh Framework Programme, 607197
Note

QC 20170508

Available from: 2017-05-08 Created: 2017-05-05 Last updated: 2017-05-08Bibliographically approved

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