Shape-Morphing Space Frame (SMSF) Using Linear Bistable Elements

Alqasimi, Ahmad; Lusk, Craig P.

doi:10.1115/detc2015-47526

Cited by 5 publications

(7 citation statements)

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“…Alqasimi [29] presented a bistable element of bar-constrained quadrilateral linkage. In the present study, we introduce quadrilateral linkage as a parallelogram ABDC, as shown in Figure 1, to be periodically arranged as a two-dimensional metamaterial.…”

Section: Modeling Approachmentioning

confidence: 99%

“…We designed a two-dimensional periodic structure using the bistable structure of Alqasimi [29] and the flexure hinge of Schotborgh et al [33], as shown in Figure 3. The red line in the figure shows the bistable structure of Alqasimi et al [29] and the flexure hinge of Schotborgh et al [33]. The red dashed line connects the midpoint of the edge AB (CD) and the vertex Q (P').…”

Section: Modeling Approachmentioning

confidence: 99%

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Martensitic Phase-Transforming Metamaterial: Concept and Model

Kanegae,

Okugawa,

Koizumi

2023

Materials

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We successfully developed a mechanical metamaterial that displays martensitic transformation for the first time. This metamaterial has a bistable structure capable of transitioning between two stable configurations through shear deformation. The outer shape of the unit cell of this structure is a parallelogram, with its upper and lower sides forming the bases of two solid triangles. The vertices from these triangles within the parallelogram are linked by short beams, while the remaining vertices are linked by long beams. The elastic energy of the essential model of the metamaterial was formulated analytically. The energy barrier between these two stable configurations consists of the elastic strain energy due to the tensile deformation of the short beams, the compressive deformation of the long beams, and the bending deformation of the connecting hinges. One example of a novel metamaterial was additively manufactured via the materials extrusion (MEX) process of thermoplastic polyurethane. The metamaterial exhibited deformation behaviors characteristic of martensitic transformations. This mechanical metamaterial has the potential to obtain properties caused by martensitic transformation in actual materials, such as the shape memory effect and superelasticity.

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Section: Modeling Approachmentioning

confidence: 99%

Section: Modeling Approachmentioning

confidence: 99%

Martensitic Phase-Transforming Metamaterial: Concept and Model

Kanegae,

Okugawa,

Koizumi

2023

Materials

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“…Mechanism. e model's equations were obtained by solving the equations of kinetic and virtual work for an extended study [32].…”

Section: Modeling Of Bistable Compliantmentioning

confidence: 99%

“…GA employs mutation technique to prolong solution converging for Pareto front, obtained from PSO, to attain high-accuracy FF levels for the optimizing model [32]. Two outputs in the form of FFs were executed by the GA-PSO method through MATLAB's optimization toolbox.…”

Section: Multiresponse Ga-pso Of Bcms With Mlpsmentioning

confidence: 99%

Multiresponse Optimization of Linkage Parameters of a Compliant Mechanism Using Hybrid Genetic Algorithm‐Based Swarm Intelligence

Alfattani

Yunus

Alamro

et al. 2021

Computational Intelligence and Neuroscience

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This research focuses on the synthesis of linkage parameters for a bistable compliant system (BSCS) to be widely implemented within space applications. Initially, BSCS was theoretically modeled as a crank-slider mechanism, utilizing pseudo-rigid-body model (PRBM) on stiffness coefficient (v), with a maximum vertical footprint (bmax) for enhancing vibration characteristics. Correlations for mechanism linkage parameters (MLPs) and responses (v and bmax) were set up by utilizing analysis of variance for response surface (RSM) technique. RSM evaluated the impact of MLPs at individual/interacting levels on responses. Consequently, a hybrid genetic algorithm-based particle swarm/flock optimization (GA-PSO) technique was employed and optimized at multiple levels for assessing ideal MLP combinations, in order to minimize characteristics (10% v + 90% of bmax). Finally, GA-PSO estimated the most appropriate Pareto-frontal optimum solutions (PFOS) from nondominance set and crowd/flocking space approaches. The resulting PFOS from validation trials demonstrated significant improvement in responses. The adapted GA-PSO algorithm was executed with ease, extending the convergence period (through GA) and exhibiting a good diversity of objectives, allowing the development of large-scale statistics for all MLP permutations as optimal solutions. A vast set of optimal solutions can be used as a reference manual for mechanism developers.

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“…To experimentally verify the bistability, it is sufficient to show that a mechanism has two configurations which it will hold while being perturbed (i.e., being shaken, turned upside down, etc.) Alqasimi et al demonstrated a shape-morphing space frame using a linear bistable compliant crank-slider mechanism [22] that is arranged in a specific pattern to produce a shape-changing structure [23]. Bistable shape-shifting surfaces can produce morphing structures with a line-of-sight integrity, i.e., effectiveness as a physical barrier [24].…”

Section: Introductionmentioning

confidence: 99%

A Lamina-Emergent Frustum Using a Bistable Collapsible Compliant Mechanism

Alfattani

Lusk

2018

Journal of Mechanical Design

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This paper presents a new bistable collapsible compliant mechanism (BCCM) that is utilized in a lamina-emergent frustum. The mechanism is based on transforming a polygon spiral into spatial frustum shape using a mechanism composed of compliant links and joints that exhibits a bistable behavior. A number of mechanism types (graphs) were considered to implement the shapemorphing spiral, including 4-bar, 6-bar, and 8-bar chains. Our design requirements permitted the selection of a particular 8-bar chain as the basis for the BCCM. The bistable behavior was added to the mechanism by introducing a snap-through bistability as the mechanism morphs. A parametric CAD was used to perform the dimensional synthesis. The design was successfully prototyped. We anticipate that the mechanism may be useful in commercial small animal enclosures or as a frame for a solar still. Fig. 1 The-ball-on-a-hill analogy for bistable mechanisms.

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Shape-Morphing Space Frame (SMSF) Using Linear Bistable Elements

Cited by 5 publications

References 0 publications

Martensitic Phase-Transforming Metamaterial: Concept and Model

Martensitic Phase-Transforming Metamaterial: Concept and Model

Multiresponse Optimization of Linkage Parameters of a Compliant Mechanism Using Hybrid Genetic Algorithm‐Based Swarm Intelligence

A Lamina-Emergent Frustum Using a Bistable Collapsible Compliant Mechanism

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