scholarly journals Strain Transfer Characteristics of Resistance Strain-Type Transducer Using Elastic-Mechanical Shear Lag Theory

Sensors ◽  
2018 ◽  
Vol 18 (8) ◽  
pp. 2420 ◽  
Author(s):  
Yongqian Li ◽  
Zhigang Wang ◽  
Chi Xiao ◽  
Yinming Zhao ◽  
Yaxin Zhu ◽  
...  
Keyword(s):  
Strain Gauge ◽  
Structural Parameters ◽  
Resistance Strain ◽  
Shear Lag ◽  
Strain Transfer ◽  
Resistance Strain Gauge ◽  
Transfer Characteristics ◽  
Strain Type ◽  
Type Transducer ◽  
Shear Lag Theory

The strain transfer characteristics of resistance strain gauge are theoretically investigated. A resistance strain-type transducer is modeled to be a four-layer and two-glue (FLTG) structure model, which comprises successively the surface of an elastomer sensitive element, a ground adhesive glue, a film substrate layer, an upper adhesive glue, a sensitive grids layer, and a polymer cover. The FLTG model is studied in elastic–mechanical shear lag theory, and the strain transfer progress in a resistance strain-type transducer is described. The strain transitional zone (STZ) is defined and the strain transfer ratio (STR) of the FLTG structure is formulated. The dependences of the STR and STZ on both the dimensional sizes of the adhesive glue and structural parameters are calculated. The results indicate that the width, thickness and shear modulus of the ground adhesive glue have a greater influence on the STZ ratio. To ensure that the resistance strain gauge has excellent strain transfer performance and low hysteresis, it is recommended that the paste thickness should be strictly controlled, and the STZ ratio should be less than 10%. Moreover, the STR strongly depends on the length and width of the sensitive grids.

Research on Temperature Compensation of the Fiber Bragg Grating Sensor and the Resistance Strain Gauge

2021 ◽  
Vol 16 (6) ◽  
pp. 1020-1027
Author(s):  
Feng Zhu ◽  
Min Liu ◽  
Chengjun Xu ◽  
Sheng Zou ◽  
Chentong Chen ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Strain Gauge ◽  
Temperature Compensation ◽  
Metal Structure ◽  
Resistance Strain ◽  
Fiber Bragg Grating Sensor ◽  
Bragg Grating ◽  
Resistance Strain Gauge ◽  
Strain Monitoring ◽  
Bragg Grating Sensor

The fiber Bragg grating sensor is widely used in strain monitoring of large metal structure and trend to replace the resistance strain gauge due to its advantages of strong stability, high measurement accuracy, multiple points measuring, strong environmental suitability and long transmission distance. The temperature-induced strain, which can have the same order of magnitudes as the mechanically-induced strain, will cause great errors in the strain monitoring. Therefore, the temperature compensation for the sensors is essential to guarantee the measurement accuracy. The existing theoretical models and experiment platforms for analyzing the temperature compensation are established by assuming that the testing temperature is constant. However, the surrounding temperature of some large metal structure is not stable, and the effect of temperature change cannot be neglected. This paper aims to establish an analytic model and an experiment platform to compare the temperature compensation of the fiber bragg grating sensor and the resistance strain gauge. The superiority of the temperature compensation for the fiber bragg grating sensor is verified. The result provides theoretical support for choosing the fiber bragg grating sensor in the long-time strain monitoring.

Study on Eliminating the Effect of Bending Moment in Torque Measurement

2012 ◽  
Vol 217-219 ◽  
pp. 2293-2298
Author(s):  
Qing Hai Jiang ◽  
Yu Sun ◽  
Xiao Yong Xu
Keyword(s):  
Adverse Effect ◽  
Strain Gauge ◽  
Bending Moment ◽  
Resistance Strain ◽  
Torque Measurement ◽  
Motor Shaft ◽  
Principle Of Superposition ◽  
Resistance Strain Gauge ◽  
Transmission Shaft

The function characteristics of bending moment and torque were analyzed based on the principle of torque measurement and the adverse effect of bending moment to torque measurement was proved theoretically. By distributing the positions of resistance strain gauge on the transmission shaft and the relative positions in the bridge, an effective method of eliminating the adverse effect of bending moment was proposed base on the principle of superposition and counterbalance in the bridge, and the potential errors were analyzed and corrected. Then the proposed method was applied in measuring the torque of a motor shaft. The result shows that the effect of bending moment has been eliminated, and this method is feasible and effective.

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