The three-dimensional, dynamic, elastic-plastic response of a right-angle bent cantilever pipe, with an initially uniform, circular cross section, subjected to out-of-plane loading is examined using finite element beam and shell models in ABAQUS. The large-deflection behavior involves both bending and torsional elastoplastic deformations of the pipe, phenomena which have not been previously studied in the context of the dynamic problem of pipe whip. Initially, neglecting ovalization and local collapse (kinking), the bent pipe is modeled as a beam, using spatial beam elements in ABAQUS. This enables the basic three-dimensional kinematic behavior of the pipe to be analyzed. A similar, but potentially more accurate, analysis was then performed using shell elements. It is shown that there is no significant difference in the global dynamic plastic response. However the ovalization of the pipe cross section and formation and movement of the plastic zones (hinges) can be captured by using shell elements. This provides data which could form the basis for examining local failures in the pipe run. Previously unpublished experimental results, obtained in an earlier study by some of the present authors, are compared with the simulated results. Good agreement is observed and it is concluded that a nonlinear dynamic model using finite elements provides a rigorous approach for estimating the hazard zone (HZ) and, also, for treating the kinematics of a whipping pipe for this complex three-dimensional situation.
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January 2012
Research Papers
Out-of-Plane Pipe Whip for a Bent Cantilever Pipe: Comparison Between Experiment and FEM Models
S. R. Reid,
S. R. Reid
Fellow ASME
School of Engineering,
University of Aberdeen
, Aberdeen AB24 3UE, UK
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M. Aleyaasin,
M. Aleyaasin
School of Engineering,
University of Aberdeen
, Aberdeen AB24 3UE, UK
Search for other works by this author on:
B. Wang
B. Wang
School of Engineering,
University of Aberdeen
, Aberdeen AB24 3UE, UK
Search for other works by this author on:
S. R. Reid
Fellow ASME
School of Engineering,
University of Aberdeen
, Aberdeen AB24 3UE, UK
M. Aleyaasin
School of Engineering,
University of Aberdeen
, Aberdeen AB24 3UE, UK
B. Wang
School of Engineering,
University of Aberdeen
, Aberdeen AB24 3UE, UK
J. Appl. Mech. Jan 2012, 79(1): 011005 (7 pages)
Published Online: November 14, 2011
Article history
Received:
March 14, 2011
Revised:
July 12, 2011
Posted:
July 26, 2011
Published:
November 14, 2011
Online:
November 14, 2011
Citation
Reid, S. R., Aleyaasin, M., and Wang, B. (November 14, 2011). "Out-of-Plane Pipe Whip for a Bent Cantilever Pipe: Comparison Between Experiment and FEM Models." ASME. J. Appl. Mech. January 2012; 79(1): 011005. https://doi.org/10.1115/1.4004712
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