Abstract null null The interfacial robustness of perovskite solar cells (PSCs) is important due to the potential for failure resulting from applied loads or deformation in devices that are fabricated on rigid or flexible substrates, and/or residual stresses due to thermal expansion mismatch between layers. Since these can occur across any of the interfaces within typical hybrid organic–inorganic perovskite solar cells, we explore the mechanisms of interfacial fracture between the layered structu...
#1Fani Derveni(University of Massachusetts Amherst)H-Index: 2
#2Andrew J. Gross(USC: University of South Carolina)H-Index: 24
Last. Simos Gerasimidis(University of Massachusetts Amherst)H-Index: 13
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Abstract null null Advances in additive manufacturing have enabled a new generation of materials with advantageous properties inherent to their architecture. Recently, architected materials with periodic arrangements of plates, called plate-lattice materials, have been developed to reach theoretical least upper bounds for stiffness and strength of isotropic materials. This work investigates the buckling behavior of several plate-lattice architectures with relative densities between 0.5% to 25% w...
Last. Wei Chen(NU: Northwestern University)H-Index: 119
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Abstract null null Data science as the promising paradigm provides novel and diverse opportunities for structural metamaterials attaining exceptional mechanical properties. It is demonstrated here that porous structures composed of brittle constitutive materials can be strong and tough through topological optimization and data-driven techniques. We show that brittle fracture properties can be tailored through the linear control of the homogenized stress and non-periodic microstructures from a mu...
#1Vito Cacucciolo(EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 10
#2Herbert Shea(EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 55
Last. Giuseppe Carbone(IPN: Instituto Politécnico Nacional)H-Index: 45
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Abstract null null Electroadhesion endows robots with super-human abilities: mechanical geckoes that climb vertical walls and soft grippers that grasp the most delicate objects. Based on electrostatics, the adhesion forces are turned on and off by an electrical signal, promising extremely fast operation, from silent fully solid-state devices. Practical applications of electroadhesion have however been limited to date by two main challenges: (1) the adhesion forces can vary over 1000x by simply c...
Last. Yuli Chen(BUAA: Beihang University)H-Index: 21
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Abstract null null Reconfiguring to complex 3-dimensional (3D) target shapes from an easily-manufactured low dimensional initial configuration is crucial for many versatile materials/structures which require tunable functions and multiple applications. However, the energy-efficient morphing strategy to realize such transdimensional shape-reconfiguration remains largely unexplored. Here a 1-dimensional (1D) wire-shaped multistable metastructure, named metawire, which has rich shape-reconfigurabil...
#1Jinxin Wang(DUT: Dalian University of Technology)H-Index: 1
#2Houyang Li(DUT: Dalian University of Technology)
Last. C.W. Lim(City University of Hong Kong)H-Index: 63
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Abstract null null A novel, high-fidelity (hi-fi) thermophone based on three-dimensional porous CNT sponge is designed for attachable and wearable sound generation devices. In addition to its simple structure and easy fabrication, CNT sponge thermophone exhibits excellent thermoacoustic and mechanical characteristics, particularly its wideband frequency response, due to its highly efficient energy conversion capability through the CNT nano-structural materials. In this paper, the hi-fi sound res...
#1Zhaofan Li(NDSU: North Dakota State University)H-Index: 3
#2Yangchao Liao(NDSU: North Dakota State University)H-Index: 4
Last. Wenjie Xia(NDSU: North Dakota State University)H-Index: 22
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Abstract null null Cellulose nanocrystals (CNCs) thin films draw considerable interest in engineering and technological applications due to their excellent mechanical and physical properties associated with dynamic and microstructural features. Here, we employ coarse-grained molecular dynamics (CG-MD) simulations to investigate how the dynamics and microstructure change in the CNC films under tensile deformation. Our results show that the Young’s modulus can be quantitatively predicted by the po...
Abstract null null Metamaterials-based acoustic sensing technologies play an important role in many practical applications, such as structural health monitoring, sound source localization, underwater acoustic communication, etc. Here, we propose a gradient acoustic metamaterial (GAM) with tunablity for acoustic sensing. The proposed tunable GAM consists of an array of plates and couples with springs, which enables the working frequency band to be broadened and adjusted by compressing the springs...
#1Tianzhen Liu(HIT: Harbin Institute of Technology)
#2Yuzhen Chen(UCLA: University of California, Los Angeles)H-Index: 3
Last. Lihua Jin(UCLA: University of California, Los Angeles)H-Index: 25
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Abstract null null Snap-through instability of viscoelastic materials is known to generate novel behavior, featured as pseudo-bistability, i.e. the capability of a system in maintaining a deformed configuration for a certain period of time after removal of an external load, followed by snapping back to its initial configuration automatically, due to the combination of time-dependent mechanical property and geometric nonlinearity of the system. This work numerically, experimentally, and analytica...
#1Roderic S. Lakes(UW: University of Wisconsin–Madison)H-Index: 84
Abstract null null Hinged lattices are envisaged with Sarrus linkages in the ribs and with rigid nodes where the ribs intersect. Triangulated lattices with Sarrus hinged ribs only deform volumetrically and have a Poisson’s ratio of −1. Lattices containing squares and hexagons can deform axially as well as volumetrically. All the lattices are compliant with respect to tension and compression and rigid with respect to bending. The lattices exhibit extreme Cosserat elasticity corresponding to rotat...
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