An Investigation of Air-leakage between Contact Surfaces : 2nd Report, On Case in which the Deformation of Surface Irregularities was Assumed to be Elasto-plastic

摘要

In the case in which a specimen was pressed against a rigid smooth surface, assuming its surface irregularities had a form of similar truncated cone in the same manner as the 1st report and the deformation of the truncated cone was elasto-plastic, the analytical values of equivalent gap for the fluid leakage between them were derived considering the permanent reduction of the central height of surface roughness. The results obtained can be summarized as follows : (1) The analytical values of equivalent gap obtained by assuming the surface irregularities as elasto-plastic were in agreement with the experimental values with a deviation of about 7%, excepting the condition of which the applied load was low, i.e. less than about 5kg/cm^2,where abnormally high surface irregularities existed on the surface roughness. The values obtained by assuming the surface irregularities as ideally plastic, furthermore, were derived in the same results as above.(2) The analytical expression of balance conditions between applied load and supplied gas pressure between contact surfaces was derived and the analytical values were in good agreement with the experimental results.