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Results |
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The figure below shows an envelope plot of maximum plastic bending strain for all payout analyses superimposed over each other. Using the Tooltips on the plot viewer over the region of largest strain we are able to identify the location on the pipe which experiences the largest plastic deformation throughout the installation process.
Plastic Strain vs Pipe Length for all Payout Analyses
The first significant plastic strain is experienced around time 537s, as shown in the time history of plastic bending strain at the critical location we identified along the pipe.
Timetrace of Plastic Strain at Element 954
Examining the model view at this time for that location on the pipe we can see that this occurs when the pipe is deforming over the stinger under its own self weight during the payout.
Model View - Critical Plastic Strain Location - Payout at 537s
At a time of 1628s if we examine the time trace of plastic strain we see that total bending strain has returned to zero, and examining the model view at this location and time we see that the pipe is straightening out as it is being lowered onto the seabed.
Model View - Critical Plastic Strain Location - Payout at 1628s
By the end of the simulation, the direction of curvature has now fully reversed from hogging to sagging and we are left with residual strain at this location as shown in the timetrace of plastic strain.
Model View - Critical Plastic Strain Location - Payout Complete