A brief review of dynamic mechanical metamaterials for mechanical energy manipulation

Wu, Lingling; Wang, Yong; Chuang, Kuo-Chih; Wu, Fugen; Wang, Qianxuan; Lin, Wenming; Jiang, Hanqing

doi:10.1016/j.mattod.2020.10.006

Cited by 114 publications

(29 citation statements)

References 193 publications

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“…In order to rotate rigid square-shaped units and to build hierarchical structures, adjacent units have been connected on the edges between the vertices. Holes made in the four vertices were used for pin joints [27]. This solution relies on previous work [28], which showed a set of simple cuts to obtain a wide range of desired shapes and patterns, including hinges consisting of partially cut units.…”

Section: Designing Auxetic Structures Made Of Rigid Elements In the F...mentioning

confidence: 99%

Auxetic Structures from Rotating Squares

Plewa¹,

Płońska²,

Lis³

2022

Preprint

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The article deals with auxetic structures made on the basis of suitably connected rigid rotating squares (from Grima and Evans), with axes of rotation on the squares’ surface. The geometric model and the resulting relationships that allow for the determination of Poisson’s ratio are considered in detail. It is demonstrated that changing the rotation axis position does not affect the negative Poisson’s ratio, equal to -1. The models built confirm the initial considerations and can offer new application possibilities.

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Section: Designing Auxetic Structures Made Of Rigid Elements In the F...mentioning

confidence: 99%

Auxetic Structures from Rotating Squares

Plewa¹,

Płońska²,

Lis³

2022

Preprint

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“…The results of the previous section provide a hypothetical upper bound for the electromomentum coefficient, which is accessible only if all material properties can be engineered independently. The significant progress on the design of engineered stiffness and mass density [60,61], motivates us to term the optimal design of C and ρ as the applicable design. Figure 9 shows the solution of this optimization over C and ρ, when the rest of the properties are chosen according to the DMO optimal result (Figure 2).…”

Section: Optimization Over the Designable Mass Density And Stiffnessmentioning

confidence: 99%

Maximizing the electromomentum coupling in piezoelectric laminates

Kosta¹,

Muhafra²,

Pernas-Salomón³

et al. 2022

Preprint

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Asymmetric piezoelectric composites exhibit coupling between their macroscopic linear momentum and electric field, a coupling that does not appear at the microscopic scale. This electromomentum coupling constitutes an additional knob to tailor the dynamic response of the medium, analogously to the Willis coupling in elastic composites. Here, we employ topologyand free material optimization approaches to maximize the electromomentum coupling of periodic piezoelectric laminates in the low frequency, long-wavelength limit. We find that the coupling can be enhanced by orders of magnitude, depending on the degrees of freedom in the optimization process. The optimal compositions that we find provide guidelines for the design of metamaterials with maximum electromomentum coupling, paving the way for their integration in wave control applications.

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“…Actively morphing flat materials into desired 3D configurations is a promising area of research for functional materials, soft actuators, etc. Multiple applications of stimuli-triggered shape-morphing systems can be found in soft robotics [ 1 , 2 , 3 , 4 ], biomedical devices [ 5 , 6 , 7 ], biomimetic manufacturing [ 8 , 9 ], flexible electronics [ 10 , 11 , 12 , 13 ], and mechanical metamaterials [ 14 , 15 , 16 , 17 , 18 , 19 ]. The spatial arrangement of heterogeneous materials with differential responses to different types of stimuli is a widely used strategy to achieve smart shape transformations [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Programming Soft Shape-Morphing Systems by Harnessing Strain Mismatch and Snap-Through Bistability: A Review

Guo

Wei

et al. 2022

Materials

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Multi-modal and controllable shape-morphing constitutes the cornerstone of the functionalization of soft actuators/robots. Involving heterogeneity through material layout is a widely used strategy to generate internal mismatches in active morphing structures. Once triggered by external stimuli, the entire structure undergoes cooperative deformation by minimizing the potential energy. However, the intrinsic limitation of soft materials emerges when it comes to applications such as soft actuators or load-bearing structures that require fast response and large output force. Many researchers have explored the use of the structural principle of snap-through bistability as the morphing mechanisms. Bistable or multi-stable mechanical systems possess more than one local energy minimum and are capable of resting in any of these equilibrium states without external forces. The snap-through motion could overcome energy barriers to switch among these stable or metastable states with dramatically distinct geometries. Attributed to the energy storage and release mechanism, such snap-through transition is quite highly efficient, accompanied by fast response speed, large displacement magnitude, high manipulation strength, and moderate driving force. For example, the shape-morphing timescale of conventional hydrogel systems is usually tens of minutes, while the activation time of hydrogel actuators using the elastic snapping instability strategy can be reduced to below 1 s. By rationally embedding stimuli-responsive inclusions to offer the required trigger energy, various controllable snap-through actuations could be achieved. This review summarizes the current shape-morphing programming strategies based on mismatch strain induced by material heterogeneity, with emphasis on how to leverage snap-through bistability to broaden the applications of the shape-morphing structures in soft robotics and mechanical metamaterials.

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A brief review of dynamic mechanical metamaterials for mechanical energy manipulation

Cited by 114 publications

References 193 publications

Auxetic Structures from Rotating Squares

Auxetic Structures from Rotating Squares

Maximizing the electromomentum coupling in piezoelectric laminates

Programming Soft Shape-Morphing Systems by Harnessing Strain Mismatch and Snap-Through Bistability: A Review

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