A Wireless and Passive Strain Sensor With Improved Sensitivity Enabled by Negative Poisson’s Ratio Structure

Mechanically Programmable Composite Metamaterials with Switchable Positive/Negative Poisson's Ratio

“…These unique properties make them a promising candidate for broad applications in flexible electronics, [6][7][8][9] tissue engineering, [10] biomedical devices, [11] and sensors. [12][13][14][15] Generally, conventional auxetic materials are typically fabricated by designing specific geometric structures to achieve a negative Poisson's ratio. Over recent decades, researchers have devoted considerable efforts to developing auxetic structures with NPR effects, primarily achieved through mechanisms involving rotation and expansion (contraction) of the structural units.…”

“…The development of flexible auxetic two-phase composites with customizable mechanical properties would be highly desirable for practical applications such as dynamic biological tissue patches, [33] flexible sensors and so on. [12,34] In this paper, we present the design and fabrication of integrated auxetic two-phase composites, which are composed of flexible TPU-based auxetic chiral lattice structures as the frame phase and soft hydrogel filler materials with tunable modulus as the matrix phase. Through systematic investigations on the mechanical behaviors of these composites, we demonstrate that the Poisson's ratio and effective Young's modulus can be tuned by the Young's modulus ratio (E m /E f ) of two phases.…”

“…These unique properties make them a promising candidate for broad applications in flexible electronics, [ 6–9 ] tissue engineering, [ 10 ] biomedical devices, [ 11 ] and sensors. [ 12–15 ]…”

Modular reprogrammable 3D mechanical metamaterials with unusual hygroscopic deformation modes

“…It can be used as a mechanical cloak which was first fabricated by Bu ¨ckmann. 6 Based on re-entrant structures, 7,8 chiral/anti-chiral structures, 9,10 rotating square structures 11,12 or slit perforation structures, 13 negative Poisson's ratio metamaterials behave counterintuitively compared to natural materials upon stretching, i.e., tensile stress in one direction leads to an increased dimension in the orthogonal direction, which find application in the fields of biomedicine, 14,15 smart sensors, [16][17][18] and protective equipment. 19 Besides, the negative stiffness effect of metamaterials is realized by the periodic arrangement of the confined buckling beam, which has great application potential in the fields of impact energy absorption, vibration reduction, and In previous works, mechanical metamaterials always responded to various physical fields by unusual deformation, including loading or thermal fields.…”

Giant Stress-Impedance Effect in CoFeNiMoBSi Alloy in Variation of Applied Magnetic Field

“…The SI effect is, thus, a new addition to a broad series of magnetomechanical effects [ 22 ], some of which were first observed in the first half of the nineteen century, and are researched to this day due to high sensitivity of various experimental sensors, which can be obtained in newly developed materials [ 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ]. The most known of the magnetomechanical effects are magnetostrictive and Villari effects [ 33 ], the latter leads to a change in magnetic permeability due to the mechanical stress, by inducing temporary magnetic anisotropy in stress direction [ 34 ].…”