Waermeschutz und Bauweisen fuer SAeNGER-Fluessigwasserstofftanks. Phase 1b Abschlussbericht

Integral fuselage-/tank concepts and the use of non-metallic materials with low thermal expansion characteristics promise the best potential for lowest weight. In a first step, principle investigations were conducted concerning the behaviour of the material at very low temperatures and technical aspects were examined to manufactured large scale structures. In a second step, mechanical and physical characteristics of CFRP, honeycomb-core, adhesives and of other materials were determined as a data base for design of prototypes. In parallel a development philosophy was elaborated and as a consequence it was determined first to conduct cryogenic tests using reduced scale prototypes of different constructions and materials to investigate LH_2-compatibility, thermal stress and insulation performance. Consequently a two- and three layer honey-comb sample was designed and calculated with high bending resistance and the ability to be evacuated. In addition a shell segment was designed with external PUR-insulation of 35mm thickness. To perform cryogenic tests with LN_2 and LH_2 a special test equipment was established and the test samples were subject to a test cycle at equal conditons. The aim of the test-cycles was to reach stationary temperature conditions at LN_2 and LH_2 level and then to simulate a relevant mission profile by heating the outside. The test results corresponded well with analytic data and thus they are a good basis for further development and tests. (orig.)SIGLEAvailable from TIB Hannover: F95B544+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman