Abstract

In this paper, the influence of the geometry change during creep of internally pressurised plain pipes is investigated using finite element (FE) creep continuum damage analyses, by including a geometric non-linearity (GNL) function in the analyses. The validity of the FE analyses is demonstrated by comparing the results obtained using an iterative approach with those obtained from FE solutions in the uniaxial case. Results of the failure life obtained using the material properties for a CrMoV pipe steel at 640° C, clearly show a significant life reduction when the geometry change is included. In the range of the pipe diameter ratio and end load ratio investigated, it is found that the failure lives can be reduced to between 60 and 80 % of those obtained from constant geometry cases, indicating that the influence of geometry change may need to be appraised for detailed numerical analysis of pressurised pipes.

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