Auxetic kirigami metamaterials (KMs) attain negative Poisson's ratios with periodic slender cuts on thin sheets. The existing auxetic KMs forfeit auxeticity under large tensions because their mainly arises from in-plane deformation, but out-of-plane buckling could arise to cause deviations, and thicker would suffer stress failure. This paper proposes a novel family of that can realize retain for up 0.50 applied strains by fully exploiting in the design model. Numerical experimental results...

Architected metamaterials are dominantly periodic, but on the other hand, natural materials usually exhibit aperiodicity or even disordered randomness. In this study, we systematically design a novel family of mechanical that simply composed n+1 sets planar plates layered in transversely quasiperiodic manner. Through rigorous theoretical and numerical analysis, demonstrate these attain extreme maximum isotropic elastic stiffness low density limit can preserve over 96% optimal at moderate...

Dielectric elastomer actuators (DEAs) are a promising actuation technology in soft robotics owing to their large voltage-induced deformation and rapid response. However, most existing DEA design paradigms empirical or intuitive, lacking the mathematical modeling optimization methodology exploit capabilities for prescribed motion tasks. In this paper, we present an automatic maximize concerned displacement(s) of DEAs by topology applied spatial electric fields (SEFs). Our method is enabled...

Lattice structures with bistability can maintain additional equilibrium states after external loads are removed. While conventional bistable typically realize compression and torsional bistabilities under twisting loads, this paper introduces a new design of that exhibit uniaxial compression. The proposed structure is composed two co-axis polygonal prisms connected by struts. Torsional achieved opposite rotations co-axial compression, which result in snap-through instabilities the connecting...

In the optimal configuration design of piezoelectric smart structures, it is favorable to use actuation elements with certain predefined geometries from viewpoint manufacturability fragile ceramics in practical applications. However, preserving exact shape these embedded actuators and tracking their dynamic motions presents a more challenging research task than merely allowing them take arbitrary shapes. This paper proposes an integrated topology optimization method for systematic compliant...

SUMMARY A method for topology optimization of continuum structures based on nodal density variables and field mapping technique is investigated. The original discrete‐valued problem stated as an with continuous design by introducing a material into the domain. With use Shepard family interpolants, this mapped onto space defined finite number variables. employed interpolation scheme has explicit form satisfies range‐restricted properties that makes it applicable physically meaningful...

Soft robots, primarily made out of intrinsically soft materials, have flourished greatly in the past decade due to their advantages such as flexibility and adaptability over rigid-bodied robots. A rich repertoire robots designed from intuitive or biomimetic approaches been developed provide new solutions for However, these design are limited by designers' experience inspiration, a systematic methodology is still missing. We tackle this issue mathematically recasting problem under framework...

This paper identifies four categories of optimal truss lattice structures (TLSs) that together provide ultimate stiffness for arbitrary multi-loading scenarios in the low volume fraction limit. Each category consists 7 periodic sets straight bars, forming parallelepiped unit cells. Compared to other TLSs, identified TLSs most probably have simplest possible geometries with least number bar sets. Macroscopic properties a TLS are estimated using superposition model, and an optimization problem...

Abstract Pipeline‐crawling soft robots are increasingly preferable for effective inspection and maintenance of flexible pipes. However, most existing occupy the pipe cross‐sections, disrupting normal operation working systems. In this study, an innovative shell‐lattice robot is designed crawling in pipes with fluid flows. The features a hollow body pneumatic actuator middle two lattice shells at head tail parts. It enables earthworm‐like locomotion through implementation opposite radial...

Kirigami metamaterials have gained increasing attention due to their unusual mechanical properties under large stretching. However, most metamaterial designs obtained with trial-and-error approaches tend lose desirable tensile strains occurrence of instability caused by out-of-plane buckling. To cope this limitation, paper presents a systematic approach cut layout optimizing for designing kirigami working at fully exploiting buckling behaviors. This method can also mitigate the local stress...

Abstract Bi‐mode artificial metamaterials have anisotropic mechanical properties, with the ratio of bulk modulus and shear approaching an infinite value in ideal conditions. The microstructures such are currently mostly determined by parameter synthesis on basis existing heuristic configuration designs, which may considerably restrict their topologies shapes. New octagon hexagonal honeycomb bi‐mode (2D) designed through a more systematic approach based independent point‐wise interpolation...

Negative Poisson's ratio (NPR) metamaterials are attractive for their unique mechanical behaviors and potential applications in deformation control energy absorption.However, when subjected to significant stretching, NPR designed under small strain assumption may experience a rapid degradation performance.To address this issue, study aims design maintaining targeted large by taking advantage of the geometry nonlinearity mechanism.A representative periodic unit cell is modeled considering...