Stiffness and Reinforcement Effect of Electrical Resistance Strain Gauges

Ajovalasit, Augusto; D’Acquisto, Leonardo; Fragapane, Salvatore; Zuccarello, Bernardo

doi:10.1111/j.1475-1305.2007.00354.x

Cited by 21 publications

(13 citation statements)

References 4 publications

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“…One may observe similar reinforcement effects caused by a traditional electrical resistance strain gauge bonded on a specimen which is made of low modulus material. Ajovalasit et al [11,12] indicated that the electrical resistance strain gauge alters the strain distribution near the strain gauge location, i.e. the local reinforcement effect, when the specimen has a relatively large cross-section and is made of low modulus material.…”

Section: Introductionmentioning

confidence: 99%

Investigation of strain transmission of surface-bonded FBGs used as strain sensors

Cheng

2009

Sensors and Actuators A: Physical

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Section: Introductionmentioning

confidence: 99%

Investigation of strain transmission of surface-bonded FBGs used as strain sensors

Cheng

2009

Sensors and Actuators A: Physical

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“…In other words, to avoid the influence of the end effects it advisable to limit properly the ratio k = L f /L r . Taking into account that for the examined cases the ratio k = 0.4, that is, L f = 60 mm, in Table 2 the corrective coefficients provided from the proposed theory (equation (28)) are compared with those obtained from numerical results. Table 2 shows also the two cases that will be considered in the successive experimental analysis.…”

Section: Comparison Between Theoretical Model and Numerical Resultsmentioning

confidence: 99%

“…By substituting equation (36) into equation (28) and then the resulting equation into equation (37), and after simple, algebra the following formulas are obtained…”

Section: Correction Factor Cmentioning

confidence: 99%

“…To highlight the relationship between the structural material and the reinforcement effect, the beams considered have been realized by using proper composite laminates. In detail, the first beam, called B 1 , is made by a unidirectional GFRP laminate with lay-up [0°] 28 and transversal section of H s 3 b s = 50 3 7 mm 2 (see Figure 10(a)). The main elastic characteristics have been determined by proper tensile tests carried out by using a MTS test machine with a HBM extensometer having gage length of 25 mm (see Figure 10 dimensions L r 3 b r 3 H r = 12.5 3 7 3 0.25 mm 3 (see Figure 10(a)), bonded by using an epoxy resin having G a = 1100 MPa and thickness h a = 0.2 mm.…”

Section: Experimental Characterization Of the Fiber-optic Transducersmentioning

confidence: 99%

“…The problem, known as ''local reinforcement effect'' has been widely studied for SGs, [21][22][23][24][25][26][27][28][29] whereas no accurate procedures for the computation of the correction of the strain measured by an optical fiber transducer embedded on a composite patch, has been reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analysis of the accuracy of fiber-optic strain transducers installed by using composite smart patches

Zuccarello

D’Acquisto

Franco

2015

The Journal of Strain Analysis for Engineering Design

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The aim of this work is to investigate the accuracy of fiber-optic strain transducer related to the incomplete load transmission that can occur on composite smart patches used as base support for the installation of such transducer, commonly used for structural monitoring of concrete elements. In detail, since the dimensions of the transducer are generally very small compared to those of the structural element being monitored, attention is given not to the global reinforcement effect, which occurs when the transducer alters the entire strain field of the transversal section of the monitored element, but rather to the so-called local reinforcement effect, which is due to an incomplete load transmission from the analyzed structure to the transducer and results in a localized variation of the strain field, without affecting the global structural response of the monitored element. Theoretical studies carried out in this work have permitted the evaluation of a correction coefficient (C), which allows the user the correction of the measured strain or the proper transducer calibration, according to the elastic characteristics of the materials and the geometry of the structuretransducer system. The accuracy of the proposed theoretical model has been verified by finite element method analysis, varying the main factors that influence the local load transmission. Successive experimental tests have corroborated the accuracy of the formula proposed for the correction of the measured strain. In summary, the results of this study showed that the use of thick patches made by high-modulus composite materials (carbon fiber-reinforced polymer etc.), or the use of short patches, can lead to coarse error on the strain measurement; on the contrary, for thin patches made by low-modulus composite materials (fiberglass etc.) and having sufficient base length, the error is less than 61%.

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Structural Engineering for High‐Performance Flexible and Stretchable Strain Sensors

Huang

Yin

2020

Advanced Intelligent Systems

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Figure 1. Porous structures for improved sensing range. a) The water-based LBL assembly for coating CB on PU sponges. b) Current response curve of the CB@PU sponge versus compressive strain; inset: relative resistance change (ΔR/R 0 ) versus compressive strain. Reproduced with permission. [32] Copyright 2016, Wiley-VCH. c) Current response curve of the PANIH/C-RGO@PU sponge versus compressive strain. Reproduced with permission. [33] Copyright 2018, Wiley-VCH. d) Structure conversion from conventional foams to auxetic foams. e) The digital photographs and corresponding SEM images of auxetic foam before (left) and after (right) 40% tensile strain. f ) Relative resistance change in conventional foam and auxetic foam versus both compressive strain and tensile strain. Reproduced with permission. [34] Copyright 2016, Wiley-VCH. g) Schematic diagram for the fabrication of CNT/TPU composite-based strain sensor. h) Stress-strain curve and relative resistance change in the CNT/TPU strain sensor. Reproduced with permission. [36]

show abstract

Stiffness and Reinforcement Effect of Electrical Resistance Strain Gauges

Cited by 21 publications

References 4 publications

Investigation of strain transmission of surface-bonded FBGs used as strain sensors

Investigation of strain transmission of surface-bonded FBGs used as strain sensors

Analysis of the accuracy of fiber-optic strain transducers installed by using composite smart patches

Structural Engineering for High‐Performance Flexible and Stretchable Strain Sensors

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