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[論文] 一定應力 및 過大ㆍ過小應力下에서의 疲勞크랙 發生傳播擧動
송삼홍(S. H. Song),이경로(K. R. Lee) 한국자동차공학회 1991 오토저널 Vol.13 No.1
It is experimented under rotary bending stress that the spacing of two micro hole flaws is adjacent and that it is distant. In order to observe the behavior of fatigue crack propagation, two<br/> kinds of specimens are tested under constant stress and periodic overstressing. Although the crack occurs faster when two micro-hole flaws are adjacent than when they are distant, but there is no difference of the number of fracture cycles between two. The crack propagates slower under lowhigh block stress than under high-constant stress, and it propagates faster under high-low block stress than under low-constant stress. The influence of two-step block stress is serious right after the stress varies.