Limit loads of pipe elbowsFunded under: PRE-NUSAFECS C
Limit loads of elbows subjected to loads normal to the plane of the axis have been achieved for six typical geometries relevant to LMFBR, for a statically determinate pipe system made of two orthogonal straight circular tubes and a 90 elbow, loaded at one end by a concentrated (out-of-plane) moment and built-in at the other end. The Cosmos 7 computer code was used, with elastic-perfectly plastic finite elements. Limit values appear to be approximately 40 to 50 % of the fully plastic twisting moment of the cross-section, which in this case gives the limit load of the Bernoulli beam theory. Warping and ovalisation of the elbow are thus responsible for a 50 to 60 % loss of carrying capacity. Direct limit analysis by mathematical programming was performed for three geometries, with a specially adapted beam finite element method, computer time being reduced by a factor of five.
Bibliographic Reference: EUR 15696 EN (1995) 88 pp., FS, ECU 11.50
ISBN: ISBN 92-826-9914-5
Record Number: 199410694 / Last updated on: 1995-03-21
Original language: en
Available languages: en