Large rotation, large strain analysis of pipe whip with flow choking

Abstract Numerical techniques employed to analyse pipe whip movement involving large rotations and large strains that take into account the reduction in blowdown force due to flow choking in the whipping pipe are briefly described. The numerical instability (flutter) encountered in using beam type finite elements proposed earlier by Hibbitt [4] are discussed. It is shown that in dynamic analysis the use of non-linear in-elastic elements give more realistic and stable solution as compared to the use of non-linear elastic elements suggested by Hibbitt [4].