Carbon Fiber Reinforced Plastic (CFRP) material is often drilled when constructing a large aircraft structure. When drilling CFRP, many defects can be left on the CFRP hole surface. One of the most detrimental surface defects is known as fiber pull-outs, which occur when bundles of fibers are pulled away by fiber-matrix de-bonding and matrix stripping. The objective of this research is to use confocal laser scanning microscope (CLSM) in order to characterize fiber pull-outs occurred during the drilling process of quasi-isotropic CFRP. This new optical characterization method is capable of measuring maximum depth and the distributions of fiber pull-outs. Fiber pull-outs are also qualitatively characterized by SEM and CLSM. It is found that the average depth of fiber pull-outs acquired from CLSM is approximately two times larger than those from the surface profilometer. However, there is a proportional correlation of the data between CLSM and surface profilometer.
- Manufacturing Engineering Division
Characterization of Fiber Pull-Outs in Drilled CFRP Holes Using Confocal Laser Microscope
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Wang, X, Kwon, P, Pelikhatyy, R, & Kim, D(. "Characterization of Fiber Pull-Outs in Drilled CFRP Holes Using Confocal Laser Microscope." Proceedings of the ASME 2014 International Manufacturing Science and Engineering Conference collocated with the JSME 2014 International Conference on Materials and Processing and the 42nd North American Manufacturing Research Conference. Volume 2: Processing. Detroit, Michigan, USA. June 9–13, 2014. V002T02A046. ASME. https://doi.org/10.1115/MSEC2014-4115
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