Development of wireless compressive/relaxation-stress measurement system integrated with pressure-sensitive carbon black-filled silicone rubber-based sensors

S. L. Wang, P. Wang, T. H. Ding

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

In order to detect the installation compressive stress and monitor the stress relaxation between two bending surfaces on a defensive furnishment, a wireless compressive-stress/relaxation-stress measurement system based on pressure-sensitive sensors is developed. The flexible pressure-sensitive stress sensor array is fabricated by using carbon black-filled silicone rubber-based composite. The wireless stress measurement system integrated with this sensor array is tested with compressive stress in the range from 0 MPa to 3 MPa for performance evaluation. Experimental results indicate that the fractional change in electrical resistance of the pressure-sensitive stress sensor changes linearly and reversibly with the compressive stress, and its fractional change goes up to 355% under uniaxial compression; the change rate of the electrical resistance can track the relaxation stress and give out a credible measurement in the process of stress relaxation. The relationship between input (compressive stress) and output (the fractional change in electrical resistance) of the pressure-sensitive sensor is ΔR/R0 = σ × 1.2 MPa-1. The wireless compressive stress measurement system can be used to achieve sensitivity of 1.33 V/MPa to the stress at stress resolution of 920.3 Pa. The newly developed wireless stress measurement system integrated with pressure-sensitive carbon black-filled silicone rubber-based sensors has advantages such as high sensitivity to stress, high stress resolution, simple circuit and low energy consumption.

Original languageEnglish
Pages (from-to)36-41
Number of pages6
JournalSensors and Actuators A: Physical
Volume157
Issue number1
DOIs
StatePublished - Jan 2010
Externally publishedYes

Keywords

  • Compression
  • Fractional change in electrical resistance
  • Pressure-sensitive carbon black-filled silicone rubber-based sensors
  • Stress
  • Wireless measurement system

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