Study on the actuation force of triangular bistable composite laminates

Kumar, A. Phanendra; Nair, Anilkumar Parapparambil Muraleedharan; Rao, B. N.

doi:10.1002/mdp2.169

Cited by 6 publications

(4 citation statements)

References 13 publications

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“…To establish the feasibility for shape tuning while maintaining the morphing responses, we specifically investigate the fast change in shape due to bistability. Bistability arises from the relationship between mismatched prestresses across the cross section and the overall geometry of the laminate [38,39]. Bistability is thus a result of architecture and geometry.…”

Section: Tuning the Geometrymentioning

confidence: 99%

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Plant-inspired multi-stimuli and multi-temporal morphing composites

Ferrand¹,

Riley²,

Arrieta³

2022

Bioinspir. Biomim.

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Plants are inspiring models for adaptive, morphing systems. In addition to their shape complexity, they can respond to multiple stimuli and exhibit both fast and slow motion. We attempt to recreate these capabilities in synthetic structures, proposing a fabrication and design scheme for multi stimuli and multi temporal responsive plant-inspired composites. We leverage a hierarchical, spatially tailored microstructural and compositional scheme to enable both fast morphing through bistability and slow morphing through diffusion processes. The composites consisted of a hydrogel layer made of gelatine and an architected particle-reinforced epoxy bilayer. Using magnetic fields to achieve spatially distributed orientations of magnetically responsive platelets in each epoxy layer, complex bilayer architectural patterns in various geometries were realised. This feature enabled the study of plant-inspired complex designs, via finite element analysis and experiments. We present the design and fabrication strategy utilizing the material properties of the composites. The deformations and temporal responses of the resulting composites are analysed using digital image correlation. Finally, we model and experimentally demonstrate plant-inspired composite shells whose stable shapes closely mimic those of the Venus flytrap, while maintaining the multi stimuli and multi temporal responses of the materials. The key to achieve this is to tune the local in plane orientations of the reinforcing particles in the bilayer shapes, to induce distributed in plane mechanical properties and shrinkage. How these particles should be distributed is determined using finite element modelling. The work presented in this study can be applied to autonomous applications such as robotic systems.

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Section: Tuning the Geometrymentioning

confidence: 99%

“…Bistability arises from the relationship between mismatched pre-stresses across the cross-section and the overall geometry of the laminate [39,40]. Bistability is thus a result of architecture and geometry.…”

Section: 3| Tuning the Geometrymentioning

confidence: 99%

Plant-inspired multi-stimuli and multi-temporal morphing composites

Ferrand¹,

Riley²,

Arrieta³

2022

Bioinspir. Biomim.

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“…Node patterns for several typical configurations were also presented. Kumar [9] investigated the deformation behavior of bi-stable shapes obtained from triangular asymmetric composite laminate plates. They simulated the snap-through transition between bi-stable shapes under transverse point loads.…”

Section: Introductionmentioning

confidence: 99%

Free Vibration Analysis of Trapezoidal Bi-Stable Laminates Supported at the Elastic Midpoint of the Median Line

Xu,

Hao,

Zhang

et al. 2023

Mathematics

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This study investigates the natural vibration of trapezoidal bi-stable laminates (TBL) with elastic supports at the midpoints of the median lines. Configuration of the midplane of the TBL is expressed by a polynomial with 17 parameters. Then, the first order shear deformation theory, curing temperature, and nonlinear strain displacement relations combining energy principles are applied to obtain the bi-stable shapes numerically. Three translational springs and two rotational springs are added at the midpoint of the median line in the trapezoidal bi-stable laminate to acquire elastic point supports. And, by varying the stiffness of the springs, arbitrary elastic point support boundary conditions can be achieved. Chebyshev polynomials are applied to characterize the mode shape function of the TBL. The vibration mode functions of the TBL are mapped to a square area under the new coordinate system by using the coordinate mapping method. Furthermore, the effects of geometry, layup sequence, and spring stiffness on the natural vibrations of the TBL are analyzed, which provides a reference for research in this field. The innovation and highlights lie in the following: (1) the natural frequencies and modes of trapezoidal bi-stable plates are solved; (2) arbitrary elastic support is achieved by a set of artificial springs; (3) the influences of spring stiffness, layer sequence, and trapezoidal base angle on the natural vibration of a trapezoidal bi-stable plate are studied.

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“…The methods to produce multistable shells have received great attention and are well documented in the literature [1], in which thermal stress-based bistable shells [2,3] and prestress-based bistable shells [4][5][6] are found to be the most common bistable components. Since 1981, ever since Hyer reported [2] the bistable cured shapes of unsymmetrical laminates, extensive works on bistable laminates have been published, especially on the prediction of cured shapes of bistable using analytical approaches [7][8][9][10], and the robust simulation of the snap-through process by finite element analyses [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%