Mechanical Property Characterization of Intraply Hybrid Composites

Abstract

An investigation was conducted to characterize the mechanical properties of intraply hybrids made from graphite fiber/epoxy matrix (primary composites) hybridized with varying amounts of secondary composites made from S-glass or Kevlar 49 fibers. The tests were conducted using thin laminates having the same thickness. The specimens for these tests were instrumented with strain gages to determine stress-strain behavior. The results show that the mechanical properties of intraply hybrid composites can be measured using available test methods such as the 10-deg off-axis method for intralaminar shear, and conventional test methods for tensile, flexure, and Izod impact properties. Intraply hybrids have linear stress-strain curves to fracture for longitudinal tension and nonlinear stress-strain curves for intralaminar shear. The results also showed that combinations of high-modulus graphite/S-glass/epoxy matrix composites exist which yield intraply hybrid laminates with the “best” balanced properties: for example, 100 percent increase in impact resistance and 35 percent increase in tensile and flexural strengths, with no reduction in modulus compared with graphite fiber/epoxy matrix composites. In addition, the results showed that the translation efficiency of mechanical properties from the constituent composites to intraply hybrids may be assessed using a simple equation.

Parameters influencing the impact response of fiber-reinforced polymer matrix composite materials: A critical review

“…Basalt fibers have similar stiffness and strength but much superior thermal characteristics than glass ones though the quality of the reinforcements is highly responsive to the processing aspects. On the other hand, little has been explained in the impact behavior of Intra-ply hybrid composites [102]. Pegoretti et al [103] investigated lowvelocity impact response of E-glass-poly vinyl alcohol/polyester laminates in inter-ply and intraply hybrid composites.…”

Hybrid effect and pseudo-ductile behaviour of unidirectional interlayer hybrid FRP composites for civil engineering applications

“…The hybrid effects and the information of the fibres used in other authors' works, published between 1974 and 2016, were contemplated in the present work (see Table 8). Although the data collection was mainly focused on the interlayer configurations, the information of intralayer configurations presented by Chamis et al [73] was also included, since it is one of the few works in which the hybrid effect with more than 70% of LS fibres relative volume was studied.…”

Numerical modelling of the damage modes in UD thin carbon/glass hybrid laminates

“…Hybrids are usually made up of two different types of fibres and in many of the previous studies, carbon and glass layers were the constituents [1][2][3][4][5]. Since the failure strain of carbon fibres is lower than glass fibres, the first damage is certainly in the carbon layer but the final failure of the specimen depends on other material properties, interface toughness and the thickness of the layers.…”