Details
| Original language | English |
|---|---|
| Article number | 109635 |
| Journal | Composites science and technology |
| Volume | 229 |
| Early online date | 30 Jul 2022 |
| Publication status | Published - 20 Oct 2022 |
Abstract
Multistable composite shells have received great attention in shape-changing morphing applications due to their ability to attain more than one stable shape when cooled down from curing to room temperature. However, an individual bistable shell may not completely fulfil all the requirements of a morphing structure as they may require more than two stable states during the morphing action. Also, on several occasions, cylindrical bistable shapes can be found to be limiting for morphing applications. Therefore, studies on highly multistable non-cylindrical shapes are a subject of interest. In this study, we explore how unsymmetric laminates connected in series can result in an increased number of stable shapes. To analyze series-connected laminates, a semi-analytical model is developed using the Rayleigh-Ritz approach. The shapes predicted by the semi-analytical model have been validated using the results from a full geometrically non-linear finite element model and corresponding experimental results. A further enhancement in the design space of series-connected laminates is proposed by replacing the conventional cross-ply laminate with curvilinear fiber variable stiffness (VS) laminates as they allow the designer to tailor stiffness properties. Although VS laminates can be used to generate the similar stable configurations as that of conventional cross-ply laminates, they may result in different curvature values leading to tailored snap-through requirements. The developed finite element model is extended to account for unsymmetric variable stiffness laminates, where effect of curvilinear fiber alignment on the multistable design space is investigated.
Keywords
- Bistability, Composites, Multistability, Semi-analytical, Snap-through, Variable stiffness
ASJC Scopus subject areas
- Materials Science(all)
- Ceramics and Composites
- Engineering(all)
- General Engineering
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In: Composites science and technology, Vol. 229, 109635, 20.10.2022.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Investigations on the multistability of series-connected unsymmetric laminates
AU - Kumar, A. Phanendra
AU - Anilkumar, P. M.
AU - Haldar, A.
AU - Scheffler, S.
AU - Dorn, O.
AU - Rao, B. N.
AU - Rolfes, R.
N1 - Funding Information: Authors would like to acknowledge the Scholarship funded by German Academic Exchange Service: Deutscher Akademischer Austauschdienst–DAAD , during the course of this research. The second author would like extend the acknowledgment to Prime Minister's Research Fellowship Scheme, India for the support during the research. The authors gratefully acknowledge the helpful discussions with Mr. Jens Breyer during the manufacturing stage.
PY - 2022/10/20
Y1 - 2022/10/20
N2 - Multistable composite shells have received great attention in shape-changing morphing applications due to their ability to attain more than one stable shape when cooled down from curing to room temperature. However, an individual bistable shell may not completely fulfil all the requirements of a morphing structure as they may require more than two stable states during the morphing action. Also, on several occasions, cylindrical bistable shapes can be found to be limiting for morphing applications. Therefore, studies on highly multistable non-cylindrical shapes are a subject of interest. In this study, we explore how unsymmetric laminates connected in series can result in an increased number of stable shapes. To analyze series-connected laminates, a semi-analytical model is developed using the Rayleigh-Ritz approach. The shapes predicted by the semi-analytical model have been validated using the results from a full geometrically non-linear finite element model and corresponding experimental results. A further enhancement in the design space of series-connected laminates is proposed by replacing the conventional cross-ply laminate with curvilinear fiber variable stiffness (VS) laminates as they allow the designer to tailor stiffness properties. Although VS laminates can be used to generate the similar stable configurations as that of conventional cross-ply laminates, they may result in different curvature values leading to tailored snap-through requirements. The developed finite element model is extended to account for unsymmetric variable stiffness laminates, where effect of curvilinear fiber alignment on the multistable design space is investigated.
AB - Multistable composite shells have received great attention in shape-changing morphing applications due to their ability to attain more than one stable shape when cooled down from curing to room temperature. However, an individual bistable shell may not completely fulfil all the requirements of a morphing structure as they may require more than two stable states during the morphing action. Also, on several occasions, cylindrical bistable shapes can be found to be limiting for morphing applications. Therefore, studies on highly multistable non-cylindrical shapes are a subject of interest. In this study, we explore how unsymmetric laminates connected in series can result in an increased number of stable shapes. To analyze series-connected laminates, a semi-analytical model is developed using the Rayleigh-Ritz approach. The shapes predicted by the semi-analytical model have been validated using the results from a full geometrically non-linear finite element model and corresponding experimental results. A further enhancement in the design space of series-connected laminates is proposed by replacing the conventional cross-ply laminate with curvilinear fiber variable stiffness (VS) laminates as they allow the designer to tailor stiffness properties. Although VS laminates can be used to generate the similar stable configurations as that of conventional cross-ply laminates, they may result in different curvature values leading to tailored snap-through requirements. The developed finite element model is extended to account for unsymmetric variable stiffness laminates, where effect of curvilinear fiber alignment on the multistable design space is investigated.
KW - Bistability
KW - Composites
KW - Multistability
KW - Semi-analytical
KW - Snap-through
KW - Variable stiffness
UR - http://www.scopus.com/inward/record.url?scp=85137651556&partnerID=8YFLogxK
U2 - 10.1016/j.compscitech.2022.109635
DO - 10.1016/j.compscitech.2022.109635
M3 - Article
AN - SCOPUS:85137651556
VL - 229
JO - Composites science and technology
JF - Composites science and technology
SN - 0266-3538
M1 - 109635
ER -