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Polar scan technique for material characterization and identification of new operating regimes

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Abstract
The quest for more sophisticated methods imparts a significant challenge in the field of nondestructive testing (NDT) and material characterization. In this paper, we present and discuss experimental polar scans of typical carbon fibre reinforced composite materials recorded with shock wave transducers at frequencies ranging from 1 to 5 MHz. Besides the well-known measurements performed in transmission (T) and double through transmission (2T), we here introduce new investigations based on polar scans of both the backscattered and the double-double through transmission (4T) signals. Amplitude as well as the time of flight diffraction (TOFD) values of the peak amplitude are recorded as a function of the scanned solid angle. One the one hand, it is shown that sharper and more detailed polar scans, especially in TOFD recording, are obtained with the 4T method, which is advantageous for stable polar contour extraction and consequently for inferring the elasticity constants C-ij of the material under consideration. On the other hand, backscatter polar scans are shown to be highly dependent on the acoustic frequency f and relate to the surface state of both the top and the back side of the investigated sample. Results for several kinds of surface roughness, typical for composite materials, are investigated and discussed. As a conclusion of this study, we state that the backscatter polar scan presents a promising tool to map irregularities. Moreover, the TOFD recorded backscatter polar scans even suggest being useful in determining the depth of the irregularities.
Keywords
ANGLE, carbon fibre reinforced composites, DAMAGE, LIQUID, BACKWARD RADIATION, NDT, polar scan, 4T recording, backscatter

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MLA
Kersemans, Mathias, Wim Van Paepegem, Diederik Van Nuffel, et al. “Polar Scan Technique for Material Characterization and Identification of New Operating Regimes.” 15th International Conference on Experimental Mechanics, Abstracts. Ed. JF Silva Gomes & Mario AP Vaz. Porto, Portugal: INEGI, 2012. 85–86. Print.
APA
Kersemans, Mathias, Van Paepegem, W., Van Nuffel, D., Luyckx, G., De Baere, I., Zastavnik, F., Gu, J., et al. (2012). Polar scan technique for material characterization and identification of new operating regimes. In J. S. Gomes & M. A. Vaz (Eds.), 15th International Conference on Experimental Mechanics, Abstracts (pp. 85–86). Presented at the 15th International Conference on Experimental Mechanics (ICEM15 - 2012), Porto, Portugal: INEGI.
Chicago author-date
Kersemans, Mathias, Wim Van Paepegem, Diederik Van Nuffel, Geert Luyckx, Ives De Baere, Filip Zastavnik, Jun Gu, Hugo Sol, Koen Van Den Abeele, and Joris Degrieck. 2012. “Polar Scan Technique for Material Characterization and Identification of New Operating Regimes.” In 15th International Conference on Experimental Mechanics, Abstracts, ed. JF Silva Gomes and Mario AP Vaz, 85–86. Porto, Portugal: INEGI.
Chicago author-date (all authors)
Kersemans, Mathias, Wim Van Paepegem, Diederik Van Nuffel, Geert Luyckx, Ives De Baere, Filip Zastavnik, Jun Gu, Hugo Sol, Koen Van Den Abeele, and Joris Degrieck. 2012. “Polar Scan Technique for Material Characterization and Identification of New Operating Regimes.” In 15th International Conference on Experimental Mechanics, Abstracts, ed. JF Silva Gomes and Mario AP Vaz, 85–86. Porto, Portugal: INEGI.
Vancouver
1.
Kersemans M, Van Paepegem W, Van Nuffel D, Luyckx G, De Baere I, Zastavnik F, et al. Polar scan technique for material characterization and identification of new operating regimes. In: Gomes JS, Vaz MA, editors. 15th International Conference on Experimental Mechanics, Abstracts. Porto, Portugal: INEGI; 2012. p. 85–6.
IEEE
[1]
M. Kersemans et al., “Polar scan technique for material characterization and identification of new operating regimes,” in 15th International Conference on Experimental Mechanics, Abstracts, Porto, Portugal, 2012, pp. 85–86.
@inproceedings{2966519,
  abstract     = {{The quest for more sophisticated methods imparts a significant challenge in the field of nondestructive testing (NDT) and material characterization. In this paper, we present and discuss experimental polar scans of typical carbon fibre reinforced composite materials recorded with shock wave transducers at frequencies ranging from 1 to 5 MHz. Besides the well-known measurements performed in transmission (T) and double through transmission (2T), we here introduce new investigations based on polar scans of both the backscattered and the double-double through transmission (4T) signals. Amplitude as well as the time of flight diffraction (TOFD) values of the peak amplitude are recorded as a function of the scanned solid angle. One the one hand, it is shown that sharper and more detailed polar scans, especially in TOFD recording, are obtained with the 4T method, which is advantageous for stable polar contour extraction and consequently for inferring the elasticity constants C-ij of the material under consideration. On the other hand, backscatter polar scans are shown to be highly dependent on the acoustic frequency f and relate to the surface state of both the top and the back side of the investigated sample. Results for several kinds of surface roughness, typical for composite materials, are investigated and discussed. As a conclusion of this study, we state that the backscatter polar scan presents a promising tool to map irregularities. Moreover, the TOFD recorded backscatter polar scans even suggest being useful in determining the depth of the irregularities.}},
  articleno    = {{3021}},
  author       = {{Kersemans, Mathias and Van Paepegem, Wim and Van Nuffel, Diederik and Luyckx, Geert and De Baere, Ives and Zastavnik, Filip and Gu, Jun and Sol, Hugo and Van Den Abeele, Koen and Degrieck, Joris}},
  booktitle    = {{15th International Conference on Experimental Mechanics, Abstracts}},
  editor       = {{Gomes, JF Silva and Vaz, Mario AP}},
  isbn         = {{9789728826253}},
  keywords     = {{ANGLE,carbon fibre reinforced composites,DAMAGE,LIQUID,BACKWARD RADIATION,NDT,polar scan,4T recording,backscatter}},
  language     = {{eng}},
  location     = {{Porto, Portugal}},
  pages        = {{3021:85--3021:86}},
  publisher    = {{INEGI}},
  title        = {{Polar scan technique for material characterization and identification of new operating regimes}},
  year         = {{2012}},
}

Web of Science
Times cited: