The increasing competition in the field of aerospace industry requires the development of innovative lightweight-hydraulic actuators made of fibre reinforced plastics (FRP) to reduce the direct operating costs. The usage of carbon fibre reinforced plastics (CFRP) with its outstanding specific strength and stiffness provide the opportunity to achieve significant weight reductions. Because of their well defined loads the shell-shaped cylinder tube and the piston rod of hydraulic actuators are especially predestined for the application of CFRP. Metallic materials are very well suited for the glands due to the possible space-saving integration of hydraulic connections and sealing grooves as well as the resistance to the hydraulic fluid. The realisation of such an advantageous multi-material-design requires the development of innovative load introduction systems to connect metallic flanges to the CFRP-cylinder tube and the piston rod respectively. Furthermore the different coefficients of thermal expansion (CTE) have to be considered for multi-materials design in order to avoid strength-decreasing residual stresses. A further challenge arises from the integration of a diffusion-resistant coating or liner on the inner side of the CFRP-cylinder tube to provide a diffusion barrier against the hydraulic fluid and a sliding surface for the piston seal.
Development of lightweight hydraulic components in innovative fibre composite design
2012
11 Seiten, 11 Bilder, 4 Quellen
Aufsatz (Konferenz)
Englisch
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