Safety Assessment of Welds in ARIANE 5 Booster.
Sicherheitsbewertung von Schweißverbindungten - Untersuchungen an Booster- gehäusen der ARIANE 5
D.-Z. Sun, A. Ockewitz, M. Windisch, U. Clormann
ABSTRACT The boosters of ARIANE 5 are currently made of 7 rings of the high strength steel 48 CrMoNiV 4 10 (D6AC) jointed together by a Clevis Tang technique. In a future design the rings could be jointed by electron beam welding. This paper represents first results of a qualification program of this new technique. Especially, the influence of stress triaxiality on fracture behaviour of the weld metal is characterized by testing different fracture mechanics specimens, e.g. tension and bending specimens with different crack lengths and crack forms. To find the relation between global and local behaviour all experiments were simulated using the corresponding material data for different material zones. Since the weld metal fails by brittle fracture, a twoparameter concept with Jc and a parameter describing the stress triaxiality was applied for the assessment of the weld joints. Additionally nally, the RKR-model was used as local concept. Based on the results of the specimens the loading situations of a booster under operating loading were analysed for two assumed crack positions.
Publication Source: Materialprüfung, ISSN: 0025-5300
Issue: 2001-6, pp 228-235
Publisher: Carl Hanser Verlag München
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