Static Compression Test
The static compression test was performed by using the 5,000 kN compression test machine.
Figure 2 shows the load-displacement relations by static compression test. The arrow in Figure 2 indicates the initial yield point at which the laminated fiber starts to break. It is found that the load – displacement curves of the LFRR show the elastic-plastic behavior and these are obviously different from those of the usual rubber. Figures 3 and 4 illustrate the initial yield load – the number of fiber ply relation and absorbed energy – the number of fiber ply relation, respectively. It can be seen that the initial yield load and the absorbed energy of LFRR increase with the increase of the number of fiber ply. Therefore, if we want to obtain the required initial yield load, we can select the number of fiber with an appropriate tensile strength. It is also noticed from Figure 4 that the absorbed energy (18 kN-m) of HMF (25 PLY) is about 6 times larger than that (3 kN-m) of usual rubber (0 PLY).
(d)LMF25 (e) MMF5
Fig. 6. Load ~ displacement curve by rapid speed loading test.