CAJ | 학술논문

该文介绍了以20kHz超声波振动疲劳试验机对三组55SC7高强度钢试材作超高周疲劳特性试验研究。试验结果表明：在高周区及超高周区S-N曲线呈下降趋势，与传统假设完全不一；疲劳强度并不随其硬度（Hv）及弹性极限（σb）的提高而提高；疲劳裂纹萌生于试件内部，主要由硫化物和钙化物等杂质所致。
해문개소료이20kHz초성파진동피로시험궤대삼조55SC7고강도강시재작초고주피로특성시험연구。시험결과표명：재고주구급초고주구S-N곡선정하강추세，여전통가설완전불일；피로강도병불수기경도（Hv）급탄성겁한（σb）적제고이제고；피로렬문맹생우시건내부，주요유류화물화개화물등잡질소치。
A test study has been made of ultrahigh-cycle fatigue of high strength steel by means of an ultrasonic frequency of 20kHz with 3 groups of steel（55sc7）．The test result shows that fatigue rupture can occur and the fatigue endurance（S-N）continues to reduce with increase of cycles between 106 and 1010C．P．S, the fatigue strength does not increase with increase of vickers hardness and elastic limit，fatigue cracks occur in the interior of testpieces and are caused by inclusions of sulphur and calcium．This result is much different from conventional hypothesis．