Study of the Resistance Variation in Intraply/Yarn Kevlar/Glass Composite after Low-Velocity Impact
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JMEPEG https://doi.org/10.1007/s11665-020-05015-1
Study of the Resistance Variation in Intraply/Yarn Kevlar/ Glass Composite after Low-Velocity Impact Rayane Dantas da Cunha, Ricardo Alex Dantas da Cunha, Wanderley Ferreira de Amorim Junior, and Raimundo Carlos Silverio Freire Ju´nior (Submitted April 1, 2020; in revised form June 14, 2020) The study of hybrid composites has been increasing for several types of applications aimed at combining the properties of these materials and obtaining new outcomes. In the present article, low-velocity impacts were conducted in an intraply/yarn hybrid composite (hybridization in the yarn of the fabric) in order to assess its residual mechanical properties and relate them to damage propagation, comparing the results with other materials in the literature and determining the extent to which this type of hybridization influences the final result. Thus, we developed a composite with 11 layers consisting of 3 layers of bidirectional intraply/yarn Kevlar/glass hybrid fabric for the middle and outer layers of the laminate and 8 layers of bidirectional glass fiber fabric. The tests were conducted using two impact energies (61 and 76 J) until total penetration. The impact resistance of the hybrid yarn fabric improved, exhibiting a decline in the damage area, with low delamination and the possibility of repair. Keywords
intraply/yarn Kevlar/glass, low-velocity test impact, residual resistance
1. Introduction Despite the large industrial demand for composite materials in several types of structural applications, it is important to ensure that this material is not damaged or delaminated to preserve its homogeneous properties. However, impact loads can cause damage even at low energies (Ref 1). Hybridization in polymer composites is one alternative to improve impact resistance (Ref 2). It is used to combine the distinct properties of the fibers to obtain a better result than the separate fibers. Hybridization can be performed between the laminate layers, denominated interply (IE), with only one type of fiber per lamina, but more than one type in the laminate, intraply (IA), with more than one type of fiber in the lamina (glass in the longitudinal direction and carbon in the transverse direction of a fabric, for example) and intraply/yarn (IAY) with more than one type of fiber in the same strand. Many studies (Ref 3–16) hybridized the composite and assessed its behavior when impacted, associating carbon/Kevlar (Ref 17), glass/Kevlar (Ref 18) and carbon/glass (Ref 19) in interply (IE), intraply (IA) and intraply/yarn (IAY) form, albeit
Rayane Dantas da Cunha and Raimundo Carlos Silverio Freire Ju´nior, Department of Mechanical Engineering, Federal University of Rio Grande do Norte, University Campus, Lagoa Nova, Natal, RN CEP 59072-970, Brazil; Ricardo Alex Dantas da Cunha, Federal Institute of Education Science and Technology of Para´, Campus Parauapebas, Parauapebas, PA CEP 68515-000, Brazil; and Wanderley Ferreira de Amorim Junior, Department of Mechanical Engineering, Federal University of Cam
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