The dynamic response of carbon fiber-filled polymer composites

Abstract

Abstract. The dynamic (shock) responses of two carbon fiber-filled polymer composites have been quantified using gas gun-driven plate impact experimentation. The first composite is a filament-wound, highly unidirectional carbon fiber-filled epoxy with a high degree of porosity. The second composite is a chopped carbon fiber-and graphite-filled phenolic resin with littleto-no porosity. Hugoniot data are presented for the carbon fiber-epoxy (CE) composite to 18.6 GPa in the through-thickness direction, in which the shock propagates normal to the fibers. The data are best represented by a linear Rankine-Hugoniot fit: U s = 2.87 + 1.17 × u p (ρ 0 = 1.536 g/cm 3 ). The shock wave structures were found to be highly heterogeneous, both due to the anisotropic nature of the fiber-epoxy microstructure, and the high degree of void volume. Plate impact experiments were also performed on a carbon fiber-filled phenolic (CP) composite to much higher shock input pressures, exceeding the reactants-toproducts transition common to polymers. The CP was found to be stiffer than the filament-wound CE in the unreacted Hugoniot regime, and transformed to products near the shock-driven reaction threshold on the principal Hugoniot previously shown for the phenolic binder itself.[19] On-going research is focused on interrogating the direction-dependent dyanamic response and dynamic failure strength (spall) for the CE composite in the TT and 0• (fiber) directions.

Advanced Composite Materials Utilized in FDM/FFF 3D Printing Manufacturing Processes: The Case of Filled Filaments

“…The incorporation of filaments infused with carbon fiber in the field of robotics enables the creation of durable and intricately designed structural elements. Furthermore, in the realm of sports and recreation, these fibers are employed in the production of bicycle frames, drone parts, and musical instruments, enhancing effectiveness while decreasing weight [ 85 , 86 ]. Figure 4 illustrates a 3D-printed item made out of a carbon fiber-filled filament.…”

Shock-Driven Decomposition of Polymers and Polymeric Foams

“…The concepts discussed above will be used to interpret results obtained for the following materials: solid and porous (foamed) polyurethane [6,13,47,48,57,58], Epon- and Jeffamine-based epoxies [59,60], carbon fiber-filled phenolic (CP) and cyanate ester (CE) composites [5,60,61], and filled polydimethylsiloxane foam (SX358) [62,63]. These materials have been studied extensively over the last decade at Los Alamos National Laboratory, and represent solid-density unfilled polymers, polymer-filler composites, and two types of polymer foams.…”

Dual-energy X-ray computed tomography for void detection in fiber-reinforced composites

“…This technique is also applied to carbon fiber FRCs. 36,37 In this case, void content is clearly distinguishable from fibers and matrix, but similarity in the linear attenuation coefficients of the fibers and matrix renders these phases indistinguishable.…”