Automated crack detection and measurement based on digital image correlation

[Display omitted] •The presented procedure records the full crack behaviour in large-scale experiments.•DIC results of the specimen’s surface provide highly accurate crack measurements.•Complex crack patters are automatically extracted using 2D image processing methods.•Several sensitivity analyses...

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Vydáno v:Construction & building materials Ročník 256; s. 119383
Hlavní autoři: Gehri, Nicola, Mata-Falcón, Jaime, Kaufmann, Walter
Médium: Journal Article
Jazyk:angličtina
Vydáno: Elsevier Ltd 30.09.2020
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ISSN:0950-0618, 1879-0526
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Abstract [Display omitted] •The presented procedure records the full crack behaviour in large-scale experiments.•DIC results of the specimen’s surface provide highly accurate crack measurements.•Complex crack patters are automatically extracted using 2D image processing methods.•Several sensitivity analyses help in understanding the measurement uncertainty.•Crack measurements are represented with automated data visualisations tools. The acquisition and evaluation of the crack behaviour in experiments on quasi-brittle materials, such as concrete, mortar, or masonry is essential for understanding their structural behaviour. This publication presents a fully automated procedure to detect cracks and measure crack kinematics in laboratory experiments instrumented with digital image correlation (DIC). Crack lines are extracted using well-established image processing methods showing excellent agreement with the physical crack pattern. In contrast to most existing crack detectors that rely on pixel intensities of true images, the presented crack detection is based on the DIC principal tensile strain field what allows the extraction of much finer cracks and more reliable crack locations. The crack widths and slips are measured using the DIC displacement field accounting for local rotations of the specimen. Additionally, automated visualisations of the crack kinematic measurements including data smoothing are presented. Several sensitivity analyses evaluating the performance and the uncertainty of the crack detector and the crack kinematic measurements have been conducted. These analyses show that the obtained results depend on the DIC configuration and that the procedure is limited in the case of very closely spaced cracks. With appropriate DIC parameters, the procedure allows detecting crack locations with high precision and measuring crack kinematics very accurately even in large-scale experiments with complex crack patterns.
AbstractList [Display omitted] •The presented procedure records the full crack behaviour in large-scale experiments.•DIC results of the specimen’s surface provide highly accurate crack measurements.•Complex crack patters are automatically extracted using 2D image processing methods.•Several sensitivity analyses help in understanding the measurement uncertainty.•Crack measurements are represented with automated data visualisations tools. The acquisition and evaluation of the crack behaviour in experiments on quasi-brittle materials, such as concrete, mortar, or masonry is essential for understanding their structural behaviour. This publication presents a fully automated procedure to detect cracks and measure crack kinematics in laboratory experiments instrumented with digital image correlation (DIC). Crack lines are extracted using well-established image processing methods showing excellent agreement with the physical crack pattern. In contrast to most existing crack detectors that rely on pixel intensities of true images, the presented crack detection is based on the DIC principal tensile strain field what allows the extraction of much finer cracks and more reliable crack locations. The crack widths and slips are measured using the DIC displacement field accounting for local rotations of the specimen. Additionally, automated visualisations of the crack kinematic measurements including data smoothing are presented. Several sensitivity analyses evaluating the performance and the uncertainty of the crack detector and the crack kinematic measurements have been conducted. These analyses show that the obtained results depend on the DIC configuration and that the procedure is limited in the case of very closely spaced cracks. With appropriate DIC parameters, the procedure allows detecting crack locations with high precision and measuring crack kinematics very accurately even in large-scale experiments with complex crack patterns.
ArticleNumber 119383
Author Mata-Falcón, Jaime
Kaufmann, Walter
Gehri, Nicola
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  givenname: Nicola
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– sequence: 2
  givenname: Jaime
  surname: Mata-Falcón
  fullname: Mata-Falcón, Jaime
– sequence: 3
  givenname: Walter
  surname: Kaufmann
  fullname: Kaufmann, Walter
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Keywords Crack kinematic measurement
Automation
Image processing
Experimental measurement
Crack detection
Digital image correlation
Concrete structure
Language English
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Snippet [Display omitted] •The presented procedure records the full crack behaviour in large-scale experiments.•DIC results of the specimen’s surface provide highly...
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StartPage 119383
SubjectTerms Automation
Concrete structure
Crack detection
Crack kinematic measurement
Digital image correlation
Experimental measurement
Image processing
Title Automated crack detection and measurement based on digital image correlation
URI https://dx.doi.org/10.1016/j.conbuildmat.2020.119383
Volume 256
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