Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 115, Issue -, Pages 206-214Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2018.09.023
Keywords
Dark-field imaging; Microcracks; Carbon fiber-reinforced polymers; Microcomputed tomography
Funding
- EFRE [ATCZ38]
- Austrian Ministry for Transport, Innovation and Technology
- Austrian Space Applications Programme [866013]
- FFG
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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 mu m, 22.8 mu m, and 50 mu m. 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.
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