Abstract
In this study, both Flatwise and Edgewise Charpy impact behavior and the effect of high strain rate of foreign object’s shape on the energy absorption, delamination, and failure mechanisms of biodegradable hybrid composites (BHCs) were investigated. The Kenaf–Cotton (KCCK) composite specimens were made using a hand layup method, consisting of four layers of Kenaf and Cotton woven fibers (0/90) in a PLA matrix which accounted for 76% of fiber volume fraction. In high strain rate tests, two different types of projectile’s shapes namely Flat and Ogival were used. Based on the results, the KCCK specimens under Edgewise impact loading absorbed the most energy compared to their Flatwise counterpart by 75%. Furthermore, the Charpy tests revealed that the Flatwise specimens exhibited only minor deflection and surface cracks at the impacted zone, while the Edgewise specimens suffered significant delamination between the outer layers. As a result of projectile geometry in high velocity loadings, the maximum effect on specimen behavior occurred within the ballistic limit. Within this range of velocities, the projectile with a Flat nose had the worst ballistic performance with a ballistic limit velocity (17.8%) greater than the projectile with an Ogival nose.
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1 Caliber Radius Head.
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Khalili, S.M.R., Beigpour, R. & Mahajan, P. Strain rate dependency of lightweight hybrid green composite laminate-an experimental study. J Braz. Soc. Mech. Sci. Eng. 45, 283 (2023). https://doi.org/10.1007/s40430-023-04221-x
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DOI: https://doi.org/10.1007/s40430-023-04221-x