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Hydrogen as a fuel of the future for mobile applications has the potential to increase energy efficiency and reduce emissions significantly (Groos et al., 2023 1). A main focus to enable hydrogen powered aviation is the efficient storage onboard (Prewitz et al., 2023 2; Verstraete et al., 2010 3; Prewitz et al., 2020 4). Especially the storage volume is a major challenge because of the rather low volumetric energy density of compressed or either liquified hydrogen in comparison with kerosene (Hassan et al., 2021 5; Stetson et al., 2014 6; Troeltsch et al., 2020 7). Glass capillaries have a high strength, also their geometry and low hydrogen permeability make them a suitable micro pressure tank (Prewitz et al., 2018; Veziroglu et al., 2003 8; Meyer-Scherf, 2015 9). By combining glass capillaries and carbon fibers in a polymer matrix, a material composite could be developed that is both a structural element, contributing to load bearing, and a hydrogen tank at the same time. The synergetic use of the structure as storage could be a solution to tackle the problem of the increased required storage volume for hydrogen powered aviation. This paper presents a theoretical micromechanical analysis, the design and manufacturing process of the composite material, and the experimental results of tensile testing conducted on a glass capillary hybridized carbon fiber reinforced plastic (GCRP). The aim is to determine the influence of the glass capillary content on the tensile strength and tensile modulus of the GCRP.
Beck et al. (Tue,) studied this question.