Parallel Flexible Composite Pressure Sensor under Radial Negative Poisson’s Ratio Constraint

doi:10.3901/JME.2025.21.129

Abstract

Abstract: Flexible pressure sensors show great application prospects in the fields of human health monitoring and industrial collaboration due to their high flexibility and sensitivity, and the design of flexible force sensors with extremely wide linear range is of great significance to extend the application capability, so a composite pressure sensor with an embedded circumferential negative Poisson’s ratio elastomer is proposed. A flexible parallel elastomer based on the 3SS-3RRU mechanism is designed, and the elastomer motion form and circumferential negative Poisson’s ratio deformation characteristics are analyzed, and a flexible composite pressure sensor with an embedded parallel elastomer is prepared, and mechanical and inductive performance tests are carried out. The experimental results show that the composite pressure sensor has a sensitivity of 0.004 2 kPa^?1 and excellent linearity (R²=0.991) over an ultra-wide pressure detection interval of 0～121.21 kPa, which substantially improves the pressure detection range and linearity of the sensor while having good sensitivity compared with the pure foam-based pressure sensor. In addition, the proposed composite pressure sensors possess fast response (154 ms) and recovery (170 ms) capabilities, as well as excellent cyclic stability and repeatability. In the human motion health detection experiments, it is able to accurately detect the operating signals from eight different parts of the human body. It is shown that the proposed composite pressure sensor has good sensing performance and exhibits great potential for applications in human-computer interaction and medical health.

Key words: flexible pressure sensor, parallel elastomer, negative poisson's ratio, wide linear rang

CLC Number:

TP212

YAO Jiantao, YU Xianhe, GAO Weihua, LI Chaoming, FEI Xiangyu, LIU Yi. Parallel Flexible Composite Pressure Sensor under Radial Negative Poisson’s Ratio Constraint[J]. Journal of Mechanical Engineering, 2025, 61(21): 129-142.

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