Abstract
To clarify the role played by graphite flakes in notch effects of ordinary gray cast iron rotary bending tests with pipes with a radial hole were carried out. It is found that ; the notch-factors are strongly influenced by the dimensions of specimens but so long as the ratio of the radius of radial hole to that of the specimen is small the notch-factors are nearly equal to unity. To explain these phenomena a model showing the action of graphite flakes in relation to machined notch was proposed. Combining the condition that fatigue crack starts at the tips of graphite flakes with this model an expression of notch-factor was obtained which showed good agreement with experimental results. There is an optimus diameter of a hole which will be effectively be drilled at the end of a crack in oder to stop further spreading of that crack.
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