1349 ステンレス薄板の超音波曲げ疲労強度(S22-2 中炭素鋼・ステンレス鋼・Ni基合金,S22 ギガサイクル疲労)

概要

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Fatigue test system for thin sheets was constructed using an ultrasonic fatigue testing machine. Specimens were fixed at the position where the displacement amplitude became the maximum. The specimen was fatigued under full-reverse bending. Displacement at a fixed edge of the specimen and the deflection of the specimen in bending were measured with a laser displacement gage by non-contact. A vibration-mode analysis was carried out to determine the dimensions of the specimen and to calculate the applied stress on the basis of the flexural displacement amplitude. The maximum stress was observed on a fixed edge of the specimen for the case of the stress in the free side edge. On the other hand, the maximum value was observed slightly forward from the fixed edge for the case of the stress in the center. Two kinds of stainless steel sheets were fatigued with the fatigue test system. The thickness of the specimen was 83 and 106μm. The 3rd vibration-mode was selected. The fatigue crack was initiated from the free side edge of the specimen. The obtained results for both stainless steels were almost identical.
2005-09-18