はめあい軸の疲労強度に及ぼす腐食環境の影響

概要

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In order to investigate the effect of corrosive environment on fatigue strength,rotating bending fatigue tests were carried out on shrink-fitted specimens. The materials of axles tested were SUS304 stainless steel, SCM430 alloy steel and S45C carbon steel,and those of bosses were SUS304 and SF55 for SUS 304 axle, SUS420J1 for SCM430 axle, S45C for S45C axle. The tests were carried out in air, city water and 3% salt water. The fatigue strength reduction factor of shrink-fitted specimens in 3% salt water was approximately 2 for SF55+S30C, 3 for S45C, and 4 for SCM430+SUS420. It was considered that the corrosion fatigue strength (CF) of shrink-fitted specimens depended on CF of these axles because CF of shrink-fitted specimens was affected by the sensitivity to corrosion of axle. Cf of SUS304+SUS304 specimen increased more than the fatigue strength in air. In SCM430+SUS420 specimen fatigue to about 1/4 of that in air, It was coucluded that the reduction of CF was due to galvanic corrosion, stress concentration and fretting near shrink-fitted end.
1986-07-15