Crossbore intersections in liquid ends of positive displacement pumps (PDPs) have regions with high stress concentration. Due to the cyclic loading that occurs in most PDPs, these stress concentration points are susceptible to fatigue cracking. In order to prolong their life, the liquid ends are often overpressurized (autofrettaged), thus inducing beneficial compressive hoop stresses in these critical regions upon removal of the autofrettage pressure. This autofrettage process drives the region of high stress concentration beyond the elastic limit and well into the elastic-plastic region. Elastic-plastic stresses and strains due to loading and unloading were analyzed in crossbore geometries, with Bauschinger effect included, using 3-D finite element analysis of the liquid end. For comparison, an analytical approach was developed, based on the strain energy density criterion first proposed by Glinka. The approach was modified to include the Bauschinger effect for precise estimation of such stresses and strains. Good correlation was observed between elastic-plastic crossbore stresses and strains predicted by the analytical approach and the finite element analysis.
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November 1999
Research Papers
Residual Stress Estimation in Crossbores With Bauschinger Effect Inclusion Using FEM and Strain Energy Density
E. A. Badr,
E. A. Badr
Department of Mechanical and Industrial Engineering, Lebanese American University, Byblos, Lebanon
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J. R. Sorem,
J. R. Sorem
Department of Mechanical Engineering, The University of Tulsa, Tulsa, OK 74104
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S. M. Tipton
S. M. Tipton
Department of Mechanical Engineering, The University of Tulsa, Tulsa, OK 74104
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E. A. Badr
Department of Mechanical and Industrial Engineering, Lebanese American University, Byblos, Lebanon
J. R. Sorem
Department of Mechanical Engineering, The University of Tulsa, Tulsa, OK 74104
S. M. Tipton
Department of Mechanical Engineering, The University of Tulsa, Tulsa, OK 74104
J. Pressure Vessel Technol. Nov 1999, 121(4): 358-363 (6 pages)
Published Online: November 1, 1999
Article history
Received:
July 21, 1998
Revised:
June 21, 1999
Online:
February 11, 2008
Citation
Badr, E. A., Sorem, J. R., and Tipton, S. M. (November 1, 1999). "Residual Stress Estimation in Crossbores With Bauschinger Effect Inclusion Using FEM and Strain Energy Density." ASME. J. Pressure Vessel Technol. November 1999; 121(4): 358–363. https://doi.org/10.1115/1.2883715
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