Strain transfer characteristics of resistance strain-type transducer

2019 ◽  
Author(s):  
Zhigang Wang ◽  
Chi Xiao ◽  
Yinming Zhao ◽  
Yongqian Li ◽  
Zili Zhou
Keyword(s):  
Resistance Strain ◽  
Strain Transfer ◽  
Transfer Characteristics ◽  
Strain Type ◽  
Type Transducer

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.

scholarly journals Strain Transfer Characteristics of Multi-Layer Optical Fiber Sensors with Temperature-Dependent Properties at Low Temperature

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 495
Author(s):  
Taolue Yang ◽  
Huaping Wang ◽  
Xingzhe Wang
Keyword(s):  
Low Temperature ◽  
Optical Fiber ◽  
Optical Fiber Sensors ◽  
Large Temperature ◽  
Temperature Dependent ◽  
Fiber Sensors ◽  
Strain Transfer ◽  
Transfer Characteristics ◽  
Temperature Dependent Properties ◽  
Temperature Loads

Optical fiber sensors have been potentially expected to apply in the extreme environment for their advantages of measurement in a large temperature range. The packaging measure which makes the strain sensing fiber survive in these harsh conditions will commonly introduce inevitable strain transfer errors. In this paper, the strain transfer characteristics of a multi-layer optical fiber sensing structure working at cryogenic environment with temperature gradients have been investigated theoretically. A generalized three-layer shear lag model incorporating with temperature-dependent properties of layers was developed. The strain transfer relationship between the optical fiber core and the matrix has been derived in form of a second-order ordinary differential equation (ODE) with variable coefficients, where the Young’s modulus and the coefficients of thermal expansion (CTE) are considered as functions of temperature. The strain transfer characteristics of the optical sensing structure were captured by solving the ODE boundary problems for cryogenic temperature loads. Case studies of the cooling process from room temperature to some certain low temperatures and gradient temperature loads for different low-temperature zones were addressed. The results showed that different temperature load configurations cause different strain transfer error features which can be described by the proposed model. The protective layer always plays a main role, and the optimization geometrical parameters should be carefully designed. To verify the theoretical predictions, an experiment study on the thermal strain measurement of an aluminum bar with optical fiber sensors was conducted. LUNA ODiSI 6100 integrator was used to measure the Rayleigh backscattering spectra shift of the optical fiber at a uniform temperature and a gradient temperature under liquid nitrogen temperature zone, and a reasonable agreement with the theory was presented.

Analysis of strain transfer characteristics of no-substrate and thin diameter sensor

2020 ◽  
pp. 102367
Author(s):  
Xiangyan Chen ◽  
Yanan Zhang ◽  
Jinwu Qian ◽  
Xinhua Yi ◽  
Linyong Shen
Keyword(s):  
Strain Transfer ◽  
Transfer Characteristics

Rating Post-Operative Backs (Part I)

1997 ◽  
Vol 2 (4) ◽  
pp. 1-3
Author(s):  
James B. Talmage
Keyword(s):  
Spinal Stenosis ◽  
Foot Drop ◽  
Neurogenic Claudication ◽  
Root Damage ◽  
Fourth Edition ◽  
Minor Strain ◽  
Injury Model ◽  
Strain Type ◽  
A Minor ◽  
Anterior Tibialis

Abstract The AMA Guides to the Evaluation of Permanent Impairment, Fourth Edition, uses the Injury Model to rate impairment in people who have experienced back injuries. Injured individuals who have not required surgery can be rated using differentiators. Challenges arise when assessing patients whose injuries have been treated surgically before the patient is rated for impairment. This article discusses five of the most common situations: 1) What is the impairment rating for an individual who has had an injury resulting in sciatica and who has been treated surgically, either with chemonucleolysis or with discectomy? 2) What is the impairment rating for an individual who has a back strain and is operated on without reasonable indications? 3) What is the impairment rating of an individual with sciatica and a foot drop (major anterior tibialis weakness) from L5 root damage? 4) What is the rating for an individual who is injured, has true radiculopathy, undergoes a discectomy, and is rated as Category III but later has another injury and, ultimately, a second disc operation? 5) What is the impairment rating for an older individual who was asymptomatic until a minor strain-type injury but subsequently has neurogenic claudication with severe surgical spinal stenosis on MRI/myelography? [Continued in the September/October 1997 The Guides Newsletter]

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