Abstract

This study aims at evaluating the redistribution behavior of the residual stress in the multi-pass FCA butt weld of YP47 in an ultra large size containership under tensile cyclic loading. A H-slit type specimen was designed in order to simulate the restraint condition of the actual butt weld of the hatch coaming top plates. The temperature distribution of the multi-pass FCA butt weld was evaluated by heat transfer analysis. With this result, the distribution of the transverse residual stress in FCA butt weld was evaluated by thermo-mechanical analysis. And the validation of FE analysis was verified by comparing the predicted results with the experimental results obtained by both hole-drilling method and XRD. The effect of the tensile cyclic load on the redistribution of the residual stress in FCA butt weld was evaluated by using FEA. FEA results revealed that the maximum tensile transverse residual stress decreased with an increase of the applied tensile stress level. However, there was a little change in the mean transverse residual stress in FCA butt weld.

Keywords:
tensile stress, fca butt weld, upstream oil & gas, redistribution behavior, strength, analysis model, tensile cyclic load, residual stress redistribution, evaluation, restraint degree
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2014. International Society of Offshore and Polar Engineers
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