Comparing these velocity profiles to the blind insertion profiles in Figures 3.13 and 3.14, we can see that prestretching is able to minimize the oscillations quite well. This method is also able to avoid the minor stabilization period that is required with damping. Furthermore, Figures 3.19 and 3.20 plot the separation distance for two cohesive halves of node , for dynamic prestretched insertion at the time step. From these two figures we can clearly see how oscillatory the separations cohesive node are, as well as how significantly prestretching minimizes them.


In order to obtain timing information we have increased the size of the reference problem to one having segments of length , as seen in Figure 3.21, The middle nodes are made cohesive at the time step or for a critical time step reduced by to The total simulation is run for time steps ( ).
Table 3.2 gives the timing results for the cohesive and internal force calculations as well as the total simulation time. We gain a time savings in the cohesive calculations which is on par with the approximate time of insertion, time step out of , or through the simulation. The internal force calculations are increased slightly because the number of nodes has increased and hence the number of internal force calculations has also increased.