Abstract
In order to clarify the buffer action of fluid films on impulse and vibration, the behavior is examined experimentally by using a model of normally impacting two bodies. The model consists of fluid film, impacting objects (a cylinder and sphere) and a cantilever. Fluid film thickness, initial height and mass of the cylinder and sphere, and deflection of a cantilever are used as parameters. By estimating the buffer action with the coefficient of rebound, for the case where the impacting velocity is relatively small and film thickness is comparatively large, the coefficient of rebound becomes small, that is, the buffer action is clearly recognized. For the case of the same value of the momentum before the impact, the area-contacting is able to obtain a larger buffer action than point-contacting. The comparison with and the discussion about the theoretical results are also presented.
