Phase-contrast and dark-field imaging for the inspection of resin-rich areas and fiber orientation in non-crimp vacuum infusion carbon-fiber-reinforced polymers

Autor:	Johann Kastner, Jonathan Glinz, Santhosh Ayalur-Karunakaran, Sascha Senck, Simon Zabler, Jan Šleichrt, Daniel Kytýř
Přispěvatelé:	Publica
Rok vydání:	2021
Předmět:	0301 basic medicine chemistry.chemical_classification Thin layers Materials science Mechanical Engineering media_common.quotation_subject Polymer Curvature Dark field microscopy 030218 nuclear medicine & medical imaging 03 medical and health sciences 030104 developmental biology 0302 clinical medicine chemistry Mechanics of Materials Crimp Image noise Contrast (vision) General Materials Science Fiber Composite material media_common
Zdroj:	Journal of Materials Science. 56:9712-9727
ISSN:	1573-4803 0022-2461
DOI:	10.1007/s10853-021-05907-0
Popis:	In this work, we present a multimodal approach to three-dimensionally quantify and visualize fiber orientation and resin-rich areas in carbon-fiber-reinforced polymers manufactured by vacuum infusion. Three complementary image modalities were acquired by Talbot–Lau grating interferometer (TLGI) X-ray microcomputed tomography (XCT). Compared to absorption contrast (AC), TLGI-XCT provides enhanced contrast between polymer matrix and carbon fibers at lower spatial resolutions in the form of differential phase contrast (DPC) and dark-field contrast (DFC). Consequently, relatively thin layers of resin, effectively indiscernible from image noise in AC data, are distinguishable. In addition to the assessment of fiber orientation, the combination of DPC and DFC facilitates the quantification of resin-rich areas, e.g., in gaps between fiber layers or at binder yarn collimation sites. We found that resin-rich areas between fiber layers are predominantly developed in regions characterized by a pronounced curvature. In contrast, in-layer resin-rich areas are mainly caused by the collimation of fibers by binder yarn. Furthermore, void volume around two adjacent 90°-oriented fiber layers is increased by roughly 20% compared to a random distribution over the whole specimen.
Databáze:	OpenAIRE
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