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Theoretical Estimates and Experimental Validation of Microbuckling

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Theoretical Estimates and Experimental Validation of Microbuckling of Uncured Carbonepoxy Prepreg


Prepreg is widely used in composite manufacturing with advanced composites such as carbon and aramid. Prepreg has a degree of flexibility (drape) and stickiness (tack), which allows it an efficient to lay up on a mold with complex shape. However, axial instability of compressed fibers during the molding process may occur during plies layup, potentially causing fiber microbuckling and wrinkling. The phenomenon has the potential to adversely affect manufacturing efficiency, product design and the quality of laminates. Thus, it is imperative to analyze and predict the bending capabilities of uncured prepreg during manufacturing. This paper will present theoretical semiempirical estimations of fiber microbuckling. Experimental validation was carried out to measure the geometry of compressed fibers under bending using a digital microscope. The prepreg samples used in the experiment are laminates formed using carbon fiber –epoxy unidirectional M40J with various number of plies and bending radii. Theoretical estimates for fiber buckling, as well as correction factors for uncured unidirectional carbon fiber epoxy laminae are presented.


Authors: Yizhi Guo and Robert Albertani


Conference: CAMX 2016 – Anaheim


SKU/Code: TP16-0042


Pages: 15

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