13th International Conference on Fracture June 16–21, 2013, Beijing, China -5- 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 c g Displacement/mm Time/ms Figure 4. The deformation comparison of the two kinds of structures Figure 5 depicts the deformation comparison of the two kinds of structure under different velocity. As can be seen from the graph, with the increase of impact velocity, deformation of structure is heightened, and deformation of continuum cylindrical structure is a little higher than that of grid cylindrical structure. It is obvious that the deformations of the two structures are agreement better at great impact velocity. The reason is that the coupled interaction between cells of grid cylindrical structure is small at the lower impact velocity. But cell shape and configuration mode has great influence on the structural deformation, which leads to the grid cylindrical structure can absorb more energy than the continuum cylindrical structure in small deformation. However, the coupling effect between grids will lead to the deformation more integrated and more closer to the deformation of the continuum cylindrical structure with the increase of impact velocity. So the deformation process is more similar and equivalent effect is better at higher velocity. 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 Deformation/mm Time/ms V=30m/s c V=50m/s g V=50m/s c V=50m/s g V=100m/s c V=100m/s g Figure 5. The deformation comparison of two kinds of structure under different velocities 4.2 The effect of the relative density The relative density of grid cylindrical structure is changed by cell-wall thickness T2, and other
RkJQdWJsaXNoZXIy MjM0NDE=