Primary and Secondary Manufacturing of Polymer Matrix Composites by Kishore Debnath Inderdeep Singh

Author:Kishore Debnath,Inderdeep Singh
Language: eng
Format: epub
Publisher: CRC Press LLC

FIGURE 6.5 Dye-penetration technique: (a) test specimen with defects, (b) test specimen dipped in the fluorescent liquid, (c) removal of excess penetrant and (d) application of developer to identify the invisible cracks.

6.8 RADIOGRAPHY TESTING

Radiography testing is a non-destructive testing method to characterise the internal structure and presence of flaws in the polymer-based composite material. In this method, electromagnetic radiation of X-rays and neutrons are used to examine the internal structure and defects in the composite materials. Many authors carried out X-ray radiography testing in their study to evaluate the structure of the developed polymer composite and to identify the presence of defects and flaws in the geometry of the composite material. Prade et al. (2017) characterised the fibre orientation in GF-reinforced polymer and CF-reinforced polymer composites using X-ray radiography. The authors concluded that X-ray radiography-testing method does not restrict the size of the test specimen and allows for very shorter measurement. Schilling et al. (2005) investigated the internal flaws of S-glass/epoxy and graphite/epoxy composite using X-ray micro-tomography. The authors concluded that X-ray micro-tomography can clearly identify the internal flaws such as matrix cracking, fibre fracture and so on in the fibre-reinforced polymer composite. The X-ray radiography-testing method is discussed in the following section in detail.

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