Microcrack characterization in loaded CFRP laminates using quantitative two- and three-dimensional X-ray dark-field imaging

Sascha Senck, Michael Scheerer, Vincent Revol, Bernhard Plank, Christian Hannesschläger, Christian Gusenbauer, Johann Kastner

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

In this work we present a method to characterize microcracks in carbon fiber reinforced polymer (CFRP) samples with a diameter up to 120 mm using quantitative grating-based X-ray dark-field imaging. In contrast to conventional microcomputed tomography (XCT), grating-based X-ray radiography and XCT provide three complementary images: (a) attenuation contrast (AC), (b) differential phase contrast, and (c) dark-field contrast (DFC). CFRP samples were subjected to low velocity impacts, followed by subsequent short beam bending tests. Using a multiscale approach, we assessed damage two- and three-dimensionally at voxel sizes of 12.5 µm, 22.8 µm, and 50 µm. Since DFC delivers morphological information in the sub-pixel regime it is possible to quantify defects in relatively large samples whereas microcracks are not visible in AC images. We compared our results to ultrasonic testing showing that X-ray dark-field imaging improves defect detection in CFRPs without the necessity of small sample dimensions.

Original languageEnglish
Pages (from-to)206-214
Number of pages9
JournalCOMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume115
DOIs
Publication statusPublished - Dec 2018

Keywords

  • Microcrack
  • microcomputed tomography
  • dark field imaging
  • Microcracks
  • Carbon fiber-reinforced polymers
  • Dark-field imaging
  • Microcomputed tomography

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