Abstract
In a previous study, the energy absorption and dynamic response of different combinations of cylindrical fiber-reinforced pultruded hybrid composite samples made of unidirectional glass and graphite fiber/epoxy, were investigated under longitudinal compression loading. It was found that placing glass fibers in the inner core of composites resulted in a higher ultimate compressive strength and specific energy absorption. In this study, the dynamic responses of pultruded glass-graphite/epoxy hybrid specimens with rectangular cross-section subjected to transverse compression loading are reported. Crack initiation and propagation was monitored using a high-speed video camera, and the effects of hybridization were analyzed. It was found that the location of glass or graphite fibers inside the pultruded composites has no significant effect on the ultimate compressive strength under such transverse compression loading. The energy absorption in all the hybrid specimens was almost identical. Graphite/epoxy composite showed higher specific energy absorption due to its lower density, and glass/epoxy composite had the lowest specific energy absorption.
Highlights
Composites are utilized because they have desired properties which cannot be attained by other types of constituent materials
Six combinations of pultruded glass-graphite/epoxy hybrids have been experimentally studied under transverse high strain-rate compression loading, using a modified Split Hopkinson Pressure Bar (SHPB)
Location of glass or graphite fibers inside the pultruded composites had no significant effect on the ultimate compressive strength under transverse compression dynamic loading
Summary
Composites are utilized because they have desired properties which cannot be attained by other types of constituent materials. Fibrous composites, including reinforcing fibers embedded in a matrix material, are commonly used in different applications. Fiber-reinforced composite materials present different features in terms of stiffness, specific strength, deformation etc. Their usage encompasses a wide range of applications in automotive, aerospace and marine. Glass fibers have high tensile strength and low tensile modulus. A number of investigations have been carried out on pultruded composites [1]-[13]. Their results illustrate that hybridization with different percentages of glass and graphite within the same epoxy matrix has a significant effect on the mechanical properties
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