Effects Of End Loading On The Creep Failure
Behaviour Of CrMoV Welds In Main Steam
Pipelines
Author(s)
T.H. Hyde, W. Sun & A.A. Becker
Abstract
This paper describes an investigation into the effects of end (system) loading on
the creep failure behaviour of internally pressurised thick walled pipe welds, using
the FE method with simplified axisymmetric models. Steady-state and creep
damage analyses were performed for a series of new, service-aged, and repaired
welds in main steam pipes in power generation plants. The material properties
used were related to CrMoV weldment materials at 640° C. Stress distributions
were obtained and failure lives were predicted for each weld situation, under a
closed-end condition and with additional axial loading. The rupture stresses
showed very little variation across the heat-affected zone (HAZ), in the dominant
stress regions, for closed-end loading. However, the variation is more significant
when additional axial
Keywords
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