Marine Technology - January 2008 - Page#93

<BODY> <span id="lblContents">Fig. 21 Collapse in progressive mode (BB-E, FEA, side view, = 0.8 m) Fig. 24 Collapse in overall bending mode (BB-E, FEA, top view, = 0.8 m) Fig. 22 Contour of residual stress due to welding. Model BB-E: von Mises stress Fig. 25 Collapse in overall bending mode (BB-E, FEA, side view, = 0.8 m) Fig. 26 Fig. 23 Example of z-directional distribution of x-directional residual stress ( rx) due to welding in the small area of outer shell (the area is shown in Fig. 22 with open rectangle, BB-E model) Collapse in overall bending mode (BB-E, FEA, side view, outer shell hidden, = 0.8 m) former result of FEA. It is found in Fig. 27 that the reaction force in overall bending mode gradually goes down after the reaction force reaches a maximum value, which indicates the occurrence of overall buckling. However, the reaction force in the progressive collapse mode shows a somewhat large flucJANUARY 2008 tuation while maintaining the same force level. It is found in Fig. 28 that total absorbed energy is almost the same between both collapse modes. In order to investigate the details of energy absorption capability, the total absorbed energy in the case of overall buckling mode is divided into three components and they are compared. The energy ratio of the outer shell top, the outer shell MARINE TECHNOLOGY 49</span> <br /> <br /> <a href="http://www.digitalwavepublishing.com/" title="Digital Magazine">Digital Wave Publishing</a> </BODY>