Microcrack characterization in loaded CFRP laminates using quantitative two- and three-dimensional X-ray dark-field imaging
| Autor: | Michael Scheerer, Christian Gusenbauer, Sascha Senck, Vincent Revol, Johann Kastner, Christian Hannesschläger, Bernhard Plank |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Carbon fiber reinforced polymer Materials science business.industry Attenuation Radiography Ultrasonic testing X-ray 02 engineering and technology Grating 021001 nanoscience & nanotechnology computer.software_genre 01 natural sciences Dark field microscopy Mechanics of Materials Voxel 0103 physical sciences Ceramics and Composites Composite material 0210 nano-technology business computer |
| Zdroj: | Composites Part A: Applied Science and Manufacturing. 115:206-214 |
| ISSN: | 1359-835X |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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