Figure 9.
The image displays six graphical representations, labelled as Step one to Step six, illustrating variations in a layered structure over a series of steps. Each step shows a different contour shape in the structure, accompanied by numerical data of varying magnitudes. A colour gradient scale is positioned on the left side of the images, indicating a range of values from blue to red, which likely corresponds to the numerical data presented. Each step graphical representation varies slightly, demonstrating progressive changes in the shape of the structure.Six-stage axial stress in the pipe