TY - JOUR
T1 - Microcrack characterization in loaded CFRP laminates using quantitative two- and three-dimensional X-ray dark-field imaging
AU - Senck, Sascha
AU - Scheerer, Michael
AU - Revol, Vincent
AU - Plank, Bernhard
AU - Hannesschläger, Christian
AU - Gusenbauer, Christian
AU - Kastner, Johann
PY - 2018/12
Y1 - 2018/12
N2 - 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.
AB - 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.
KW - Microcrack
KW - microcomputed tomography
KW - dark field imaging
KW - Microcrack
KW - microcomputed tomography
KW - dark field imaging
KW - Microcracks
KW - Carbon fiber-reinforced polymers
KW - Dark-field imaging
KW - Microcomputed tomography
UR - https://www.sciencedirect.com/science/article/pii/S1359835X18303804
U2 - 10.1016/j.compositesa.2018.09.023
DO - 10.1016/j.compositesa.2018.09.023
M3 - Article
SN - 1359-835X
VL - 115
SP - 206
EP - 214
JO - COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
JF - COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
ER -