2031 平行部付き試験片を用いた超音波疲労試験の検討(S11-2 軸荷重下の超高サイクル疲労特性,S11 金属材料の超高サイクル疲労特性の解明)

概要

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Specimens having a straight part were used in ultrasonic fatigue testing for low-temperature-tempered SCM440 low-alloy steel. The steel used showed fish-eye fracture originating mostly from an Al_2O_3 inclusion. The ultrasonic fatigue testing results were compared with the conventional servo-hydraulic fatigue testing. The two kinds of fatigue testing results showed a good agreement in case of fish-eye fracture. This agreement supported the validity of the ultrasonic fatigue testing with specimens having a straight part. Moreover, the ultrasonic fatigue testing was conducted also with specimens without a straight part to confirm the effects of the risk volumes. As the result, the effects of the risk volumes were clearly observed i.e. the result with larger risk volumes showed lower fatigue strengths due to presence of a larger inclusion at the fish-eye fracture origin.
2007-09-07