文章基本信息

标题：疲労き裂伝播の減速現象を評価するためのシミュレーション法
本地全文：下载
作者：勝田順一 ; 楠葉貞治 ; 誉田登等
期刊名称：日本船舶海洋工学会論文集
印刷版ISSN：1880-3717
电子版ISSN：1881-1760
出版年度：2012
卷号：15
页码：125-133
DOI：10.2534/jjasnaoe.15.125
语种：Japanese
出版社：社団法人日本船舶海洋工学会
摘要：At a fatigue crack tip, the occurrence of opening-closure behavior is already known. The opening-closure behavior of a fatigue crack tip is caused by cyclic elasto-plastic deformation of the crack tip. Fatigue strength ( S - N curve ) and fatigue crack propagation rate ( da/dN- K ) have been evaluated only in mechanical environment, and they have not been evaluated by comparison with mechanical environment and the limits of material characteristic as other fracture phenomenon.The present paper proposes a numerical simulation method using comparison with mechanical environment of crack tip and the limits of material characteristic for consideration with delayed propagation of fatigue crack. In the proposed simulation method, tensile fracture elongation after compressive plastic deformation of a mild steel have been used. In this paper, the results of the case of constant amplitude loading, block loading, and constant amplitude loading with spike load are shown.