In the last reports, assuming that the surface irregularities of specimens were isotropic and had a form of similar truncated cone whose deformations were elastic, plastic and elasto-plastic, the analytical solutions of equivalent gap for the fluid leakage between contact surfaces were verified with the experimental results using a lapped carbon steel. In this paper, the specimens, which are finished by lathing and grinding, are axamined. The results obtained can be summarized as follows : (1) In the case in which the phenomenon of leakage was a radial and sector flow, the experimental values of equivalent gap obtained by assuming the surface roughness as anisotropic were in agreement with the analytical values with deviation about 8 %. (2) The characteristic curves of parameters a and b for the carbon steel listed in the 2nd report can be applied for the materials tested in this experiment.
An Investigation of Air-leakage between Contact Surfaces : 3rd Report, On Case in which Cast Iron and Brass were used as Specimen
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