Electrospun unidirectional P(VDF-TrFE) pressure sensor for small strain sensing

2018 ◽  
Author(s):  
Zi-yi Zheng ◽  
Jun-Yi Ke ◽  
Yu-Hsiang Hsu ◽  
Chih-Kung Lee
Keyword(s):  
Pressure Sensor ◽  
Small Strain ◽  
Strain Sensing

scholarly journals Strain Sensing Elastic Core-Spun Yarns Based on Long Silver Nanowires

2021 ◽  
Vol 2101 (1) ◽  
pp. 012054
Author(s):  
Liping Jia ◽  
Qi Zeng ◽  
Quanquan Zhu ◽  
Runxuan Cai ◽  
Wei Guo ◽  
...  
Keyword(s):  
Silver Nanowires ◽  
Strain Range ◽  
Small Strain ◽  
Gauge Factor ◽  
Strain Sensing ◽  
Elastic Core ◽  
Spun Yarn ◽  
Spun Yarns ◽  
Flexible Strain Sensor ◽  
Low Sensitivity

Abstract Strain sensing is one of the important functions of intelligent fabric, which can transform the external stress (or strain) into visible electrical signals and monitor the characteristics of human physiology and motion. At present, the flexible strain sensor has low sensitivity, small strain range and unstable performance after repeated stretching. In this work, core-spun yarns with polyurethane (PU) filament as core and long silver nanowires (AgNWs) loaded cotton fiber as shell was fabricated by spinning technology. The results showed that when the loading of AgNWs was 10 wt%, the strain range of the PU/cotton@AgNWs core-spun yarn was 0-60%, the gauge factor of 12.6 was linear, and the strain sensing and mechanical properties were stable after repeated stretching. This strain sensing elastic core-spun yarns constructed by spinning technology could be used as one of the important materials for intelligent wearable devices.

scholarly journals In situ hydromechanical responses during well drilling recorded by distributed fiber-optic strain sensing

2020 ◽  
Author(s):  
Yi Zhang ◽  
Xinglin Lei ◽  
Tsutomu Hashimoto ◽  
Ziqiu Xue
Keyword(s):  
Fiber Optic ◽  
Drilling Fluid ◽  
Co2 Storage ◽  
Small Strain ◽  
Strain Sensing ◽  
Well Drilling ◽  
Reservoir Permeability ◽  
Structure Heterogeneity ◽  
The Impact

Abstract. Drilling fluid infiltration during well drilling induces pore pressure and strain perturbations in neighboured reservoir formations. In this study, we in situ monitored such small strain changes (~ 20 µε) using fiber-optic distributed strain sensing in two observation wells with different distances (approximately 3 m and 9 m) from a new drilling wellbore in a shallow water aquifer. The results suggest that the drilling induced hydromechanical deformations that occurred at depths of both wells are indicative of the impact zones of fluid invasion and reservoir permeability structure (heterogeneity). A hydraulic diffusion model is used to interpret the strain evolution. The method and data would be useful for understanding reservoir pressure communications, determining the zones for fluid productions or injections (e.g., for CO2 storage), and optimizing reservoir management and utilization.

Noninvasive Monitoring of Arterial Viscoelastic Indices Using a Foil-type Pressure Sensor

2011 ◽  
Vol 131 (9) ◽  
pp. 1518-1527
Author(s):  
Hiromi Maruyama ◽  
Harutoyo Hirano ◽  
Abdugheni Kutluk ◽  
Toshio Tsuji ◽  
Osamu Fukuda ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Noninvasive Monitoring ◽  
Type Pressure

Pressure Sensor Monolithically Integrating MEMS and CMOS-LSI with CMOS Compatible “Back-end-of-line MEMS processes”

2010 ◽  
Vol 130 (5) ◽  
pp. 170-175
Author(s):  
Tsukasa Fujimori ◽  
Hideaki Takano ◽  
Yuko Hanaoka ◽  
Yasushi Goto
Keyword(s):  
Pressure Sensor ◽  
Cmos Compatible

Metal Strain Gauge Pressure Sensor Using SiO2/Si3N4 Diaphragm

2019 ◽  
Vol 139 (4) ◽  
pp. 63-68
Author(s):  
Hiroshi Nakano ◽  
Masahiro Matsumoto ◽  
Yasuo Onose ◽  
Kazuhiro Ohta
Keyword(s):  
Pressure Sensor ◽  
Strain Gauge ◽  
Gauge Pressure ◽  
Metal Strain

An Eight-Node Hexahedral Finite Element with Rotational DOFs for Elastoplastic Applications

2019 ◽  
Vol 11 (1) ◽  
pp. 54-66
Author(s):  
Ayoub Ayadi ◽  
Kamel Meftah ◽  
Lakhdar Sedira ◽  
Hossam Djahara
Keyword(s):  
Mathematical Model ◽  
Finite Element ◽  
Plastic Zone ◽  
Displacement Vector ◽  
Small Strain ◽  
Benchmark Problems ◽  
Plasticity Model ◽  
Vector Approximation ◽  
Calculation Code

Abstract In this paper, the earlier formulation of the eight-node hexahedral SFR8 element is extended in order to analyze material nonlinearities. This element stems from the so-called Space Fiber Rotation (SFR) concept which considers virtual rotations of a nodal fiber within the element that enhances the displacement vector approximation. The resulting mathematical model of the proposed SFR8 element and the classical associative plasticity model are implemented into a Fortran calculation code to account for small strain elastoplastic problems. The performance of this element is assessed by means of a set of nonlinear benchmark problems in which the development of the plastic zone has been investigated. The accuracy of the obtained results is principally evaluated with some reference solutions.

Sensitive Mechanocontrolled Luminescence in Cross-Linked Polymer Films

2019 ◽  
Author(s):  
Ayumu Karimata ◽  
Pradnya Patil ◽  
Eugene Khaskin ◽  
Sébastien Lapointe ◽  
robert fayzullin ◽  
...  
Keyword(s):  
Mechanical Stress ◽  
Polymer Films ◽  
Soft Matter ◽  
Small Strain ◽  
Visual Methods ◽  
Photoluminescence Intensity ◽  
Stimuli Responsive ◽  
Responsive Materials ◽  
Highly Sensitive ◽  
Mechanical Stretching

Direct translation of mechanical force into changes in chemical behavior on a molecular level has important implication not only for the fundamental understanding of mechanochemical processes, but also for the development of new stimuli-responsive materials. In particular, detection of mechanical stress in polymers via non-destructive methods is important in order to prevent material failure and to study the mechanical properties of soft matter. Herein, we report that highly sensitive changes in photoluminescence intensity can be observed in response to the mechanical stretching of cross-linked polymer films when using stable, (pyridinophane)Cu-based dynamic mechanophores. Upon stretching, the luminescence intensity increases in a fast and reversible manner even at small strain (< 50%) and applied stress (< 0.1 MPa) values. Such sensitivity is unprecedented when compared to previously reported systems based on organic mechanophores. The system also allows for the detection of weak mechanical stress by spectroscopic measurements or by direct visual methods.<br>

INNOVATIVE FOOT PRESSURE SENSOR DESIGN FOR HUMANOID ROBOTS

2019 ◽  
Author(s):  
FRANCISCO ARTHUR BONFIM AZEVEDO ◽  
Daniela Vacarini de Faria ◽  
Marcos Maximo ◽  
Mauricio Donadon
Keyword(s):  
Pressure Sensor ◽  
Humanoid Robots ◽  
Sensor Design ◽  
Foot Pressure
Sign in / Sign up

Export Citation Format

Share Document