The Study of the Gastightness of the Statical Contact by Means of the Leakage through it

概要

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The gastightness of the contact interstice of polished surfaces of metal is studied by means of the leakage of an indicator gas through the interstice. The clearance of interstice δ, ranging ordinarily from 1 to 10μ, is narrowed by a load W, being increased from 0 to 1500 Kg/cm2 step by step. The half of δ, ranging from 0.5 to 5μ, is the thickness of the outermost layer, which stands against our experiment, of the polished surface of metal. The estimation of δ on the diagram of log δ versus W is accurate within several percents of the magnitude of δ in the case. The polished layer of metal is in an expanded state, and is highly plastic. When such a layer is compressed, several similar modes of deformation start side by side in the layer, and end individually in the loading, while increasing compression. Accordingly the resulting figure of log δ versus W usually consists of several segments of straight line. The excess of the energy is stored in the polished layer, being split into a spectrum, corresponding to the constituent deformations mentioned above. For eamople : ΔFa=2.4×10-5, ΔFb=2.2×10-4, ΔFc=4.9×10-4, ΔFd=3.83×10-3Cal/cm2., and the sum ΣΔFi=4.56×10-3Cal/cm2. The last is estimated to be equivalent to 31.5 Cal/cc of the polished layer or to 4.1 Cal per gram of iron.
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