Load Mitigation Effect of Rubber-Rolled Pin

Figure 18 shows the circumferential strain-time relations at interval of 30° in the elastic range (W = 1 kN, H = 10 cm). It is found that the maximum strain (350 p) at No. 7 (0 = 90°) of type-B becomes about 1/4 smaller than the one (1350 p)of type-A. It is also confirmed that the difference of the maximum strain at each position of type-B is smaller rather than the one of type-A (for example, the difference of No. 1 and No. 7 in type-B is about 40%, but it is about 75% in type-A). It is guessed that this phenomenon may be caused by the larger contact area between rubber-rolled pin and plate in type-B. Thus, type-B can disperse the transmitting load to connecting plate. Therefore, the rubber-

Table 5. Type of pin (unit:mm).

rolled pin can expect not only the effect of mitigating impact load, but also the effect of dispersing impact load. This tendency was also confirmed in the radial components of strains.

Figure 19 shows the strain (at gauge No. 7) – time relations at W = 1 kN and H = 10 cm. It is apparent that the maximum strain of type-B is about 1/3-1/4 smaller than the one of type-A, and the responding period of radial strains of type-B is about twice as long as type-A. Therefore, type-B can prevent the stress concentration of connecting plate in elastic range.