Optical-Digital Method for the Determination of Strain Fields in Local Areas of Reinforced-Concrete Bridges

Ivanyts’kyi, Ya. L.; Maksymenko, O. P.; Zapotochnyi, Roman; Mol’kov, Yu. V.

doi:10.1007/s11003-015-9838-4

Cited by 4 publications

(4 citation statements)

References 5 publications

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“…qns. (10,12,20) represent the solution of the displacements when the coordinates (x 0 , y 0 ) of the reference system are known and no rigid body motion are involved. When dealing with experiments, such conditions cannot be satisfied because the experimental displacements, provided by DIC commercial software, are typically referred to a system different from the required one (x 0 , y 0 ) and because unavoidable rigid body motions always occur.…”

Section: Error Sources Analysis: Elimination Of Rigid Body Motions and Identification Of The Origin Of The Reference Systemmentioning

confidence: 99%

“…To this aim, eqs. (10,12,20) can be written as a series of iterative equations based on Taylor's series expansions as follows:…”

Section: Error Sources Analysis: Elimination Of Rigid Body Motions and Identification Of The Origin Of The Reference Systemmentioning

confidence: 99%

“…This technique offers attractive advantages as it can be applied to any kind of material; the only requirement is a surface pattern for pixels tracking which can be easily obtained by airbrushing, or simply exploiting the natural texture of the samples. Thanks to these interesting features, DIC has been used for different applications to analyze the strain field in components during operating conditions [20][21][22], to characterize the strain/stress level in biomedical implants [23,24] or to estimate the elastic properties of materials [25][26][27]. Moreover, DIC was used to calculate the fracture properties of materials [28][29][30] starting from the crack tip displacements.…”

Section: Introductionmentioning

confidence: 99%

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Inverse problems with the digital image correlation: approach and applications

Sgambitterra

Niccoli

2021

Frattura Ed Integrità Strutturale

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A viable approach to solve inverse problems in elasticity is proposed. It is based on regression algorithms to estimate materials and/or loading parameters by fitting the experimentally-evaluated displacement field to representative analytical solutions. Displacements are measured by the digital image correlation (DIC) technique and they are used as input for numerical procedures able to minimize the estimation errors of the unknowns and to quantify the unavoidable rigid body motions of the samples/components. In addition, thanks to ad-hoc developed iterative algorithms, non-linear phenomena related to high and localized stress/strain states, can be captured successfully. This latter represents a relevant novelty of the methodology as it allows to investigate plasticity-induced mechanisms in solid mechanics which are impossible to analyze with more traditional DIC-based approaches. Three different case studies are considered: 1) estimation of the stress intensity factor in fracture mechanics problems, 2) estimation of the elastic properties of a material by the Brazilian tests, 3) estimation of the contact pressure generated by thermally activated shape memory alloy (SMA) rings used for pipe coupling. The reliability and the accuracy of the method is demonstrated through systematic comparisons of the results with conventional techniques in experimental mechanics.

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Section: Error Sources Analysis: Elimination Of Rigid Body Motions and Identification Of The Origin Of The Reference Systemmentioning

confidence: 99%

“…To this aim, eqs. (10,12,20) can be written as a series of iterative equations based on Taylor's series expansions as follows:…”

Section: Error Sources Analysis: Elimination Of Rigid Body Motions and Identification Of The Origin Of The Reference Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Inverse problems with the digital image correlation: approach and applications

Sgambitterra

Niccoli

2021

Frattura Ed Integrità Strutturale

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“…New possibilities and prospects for applying the video processing technique on the DIC basis for the reinforced concrete structures destruction mechanisms and energy criteria determining can be found in previous studies 17–19 …”

Section: Technique For Measuring the Bridge Span Elements Movementmentioning

confidence: 99%

Multilaser spot tracking technology for bridge structure displacement measuring

Maksymenko

Sakharuk

Ivanytskyi

et al. 2020

Struct Control Health Monit

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Summary During the structural health monitoring of bridge structures, simultaneous noncontact determination of relative displacements in different points is preferred. The existing measurement displacement methods and systems used for bridge structures deprived of this ability or have the low accuracy and thus automation level that makes their usage for long‐term monitoring of bridge structure elements becomes impossible. To avoid the imperfections of existing methods and determining displacements simultaneously in different construction points, we proposed to use the laser spot tracking technology, in which the laser modules are mounted in certain points, and their rays are directed to the translucent screen of a recording device. After screen images recording and processing, one determines displacements of different spots formed by the laser modules on the translucent screen by specialized software. Potential opportunities for this technique are demonstrated during research of a concrete beam deflection in laboratory conditions. The errors of the proposed measurement algorithm were analyzed using computer simulation and laboratory study. The influence of laser modules and screen different spatial positions on the beam deflection measurement was also estimated. Practical application of the proposed system for underground crossing overlap vibration measurements has been showed. Based on the obtained data, several evaluations of its technical state and the residual bearing capacity of a reinforced concrete are made.

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