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Novel metric “Implenarity” for characterization of shape and defectiveness : The case of CFRP hole quality

Hrechuk, Andrii LU ; Bushlya, Volodymyr LU ; Ståhl, Jan Eric LU and Kryzhanivskyy, Vyacheslav LU (2021) In Composite Structures 265.
Abstract

Image Processing is rapidly expanding as a technique for object and defect analysis because of the high ease of its coupling to automation and IT solutions. Yet, issues with transferability of the measurement approaches and metrics currently used in mechanical systems often remain unsolved. Study reports on the developed approach for shape and defectiveness characterization by combining Delaunay triangulation of object's contour with uniformity analysis of triangles in the generated mesh using developed metric “Implenarity”. When analyzing hole drilling in CFRP, experimental validation found that for highest quality of CFRP holes, implenarity shifts from its maximum of I = 0.22 for a circle to I ≈ 0.16 for microdefects below 100... (More)

Image Processing is rapidly expanding as a technique for object and defect analysis because of the high ease of its coupling to automation and IT solutions. Yet, issues with transferability of the measurement approaches and metrics currently used in mechanical systems often remain unsolved. Study reports on the developed approach for shape and defectiveness characterization by combining Delaunay triangulation of object's contour with uniformity analysis of triangles in the generated mesh using developed metric “Implenarity”. When analyzing hole drilling in CFRP, experimental validation found that for highest quality of CFRP holes, implenarity shifts from its maximum of I = 0.22 for a circle to I ≈ 0.16 for microdefects below 100 µm—normally not quantifiable with conventional techniques. In presence of larger hole defects, implenarity demonstrated similar capabilities to standard metrics, but avoided their inherent flaws. Implenarity continued distinguishing degree of defectiveness for the same area of uncut fibers (Fa-cov) and the same delamination diameter (Fd,Fda).

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
CFRP, Delamination, Implenarity, Metrology, Uncut fibers
in
Composite Structures
volume
265
article number
113722
publisher
Elsevier
external identifiers
  • scopus:85102051012
ISSN
0263-8223
DOI
10.1016/j.compstruct.2021.113722
language
English
LU publication?
yes
id
2ed855e9-1d1e-4f21-93f7-6fbc8be61298
date added to LUP
2021-03-16 12:15:52
date last changed
2022-04-27 00:48:37
@article{2ed855e9-1d1e-4f21-93f7-6fbc8be61298,
  abstract     = {{<p>Image Processing is rapidly expanding as a technique for object and defect analysis because of the high ease of its coupling to automation and IT solutions. Yet, issues with transferability of the measurement approaches and metrics currently used in mechanical systems often remain unsolved. Study reports on the developed approach for shape and defectiveness characterization by combining Delaunay triangulation of object's contour with uniformity analysis of triangles in the generated mesh using developed metric “Implenarity”. When analyzing hole drilling in CFRP, experimental validation found that for highest quality of CFRP holes, implenarity shifts from its maximum of I = 0.22 for a circle to I ≈ 0.16 for microdefects below 100 µm—normally not quantifiable with conventional techniques. In presence of larger hole defects, implenarity demonstrated similar capabilities to standard metrics, but avoided their inherent flaws. Implenarity continued distinguishing degree of defectiveness for the same area of uncut fibers (F<sub>a-cov</sub>) and the same delamination diameter (F<sub>d</sub>,F<sub>da</sub>).</p>}},
  author       = {{Hrechuk, Andrii and Bushlya, Volodymyr and Ståhl, Jan Eric and Kryzhanivskyy, Vyacheslav}},
  issn         = {{0263-8223}},
  keywords     = {{CFRP; Delamination; Implenarity; Metrology; Uncut fibers}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Composite Structures}},
  title        = {{Novel metric “Implenarity” for characterization of shape and defectiveness : The case of CFRP hole quality}},
  url          = {{http://dx.doi.org/10.1016/j.compstruct.2021.113722}},
  doi          = {{10.1016/j.compstruct.2021.113722}},
  volume       = {{265}},
  year         = {{2021}},
}