Abstract
In this study, the dynamic response and energy absorption characteristics of different combinations of fiber-reinforced pultruded hybrid composites made of unidirectional glass and graphite fiber/epoxy, have been investigated. High strain-rate compression experiments were conducted on cylindrical specimens at an average strain rate of 700 /s using a modified Split Hopkinson Pressure Bar (SHPB). Failure was monitored with a high-speed video camera, and effects of hybridization on the dynamic behavior of pultruded composites were evaluated. It was found that for a given fiber volume fraction, placing glass fibers in the inner core results in a higher ultimate compressive strength, specific energy absorption, and in general a better dynamic performance with lower density.
Highlights
Fiber-reinforced pultruded composites are being used frequently in many advanced applications due to their many advantages such as structural strength, improved mechanical properties, low weight, and durability [1] [2]
Split Hopkinson Pressure Bar (SHPB) high strain-rate compression tests were performed on pure glass, pure graphite, and the hybrids of glassgraphite fiber/epoxy specimens to study their dynamic behavior and energy absorption characteristics
In this study, pultruded hybrid composite specimens made of glass and graphite/epoxy with different combinations of fibers were dynamically loaded using a modified compression SHPB
Summary
Fiber-reinforced pultruded composites are being used frequently in many advanced applications due to their many advantages such as structural strength, improved mechanical properties, low weight, and durability [1] [2]. Glass fibers generally provide good performance at low-cost They possess high tensile strength, their relatively low tensile modulus is a disadvantage in many applications. While pure glass/epoxy exhibited higher shear modulus than pure graphite/epoxy, the hybridization of these two materials with specific amount of glass fibers in the outer shell region resulted in better dynamic performance. Low-velocity impact response characteristics and the influence of hybridization on the crashworthiness and energy-absorption of pultruded glass-graphite/epoxy composite beams were investigated using low-velocity drop weight impact test system [8] [9]. Hybrids with graphite fibers located in the outer region showed high flexural stiffness, propagation energy, ductility, and failure index. They had lower initiation energy and a greater tendency to delaminate [9]
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