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  • 标题:極低き裂伝播速度領域における疲労き裂伝播則について RPG規準による疲労き裂伝播挙動の研究 (第3報)
  • 本地全文:下载
  • 作者:豊貞 雅宏 ; 丹羽 敏男 ; 山口 喜久次
  • 期刊名称:日本造船学会論文集
  • 印刷版ISSN:0514-8499
  • 电子版ISSN:1884-2070
  • 出版年度:1992
  • 卷号:1992
  • 期号:172
  • 页码:589-599
  • DOI:10.2534/jjasnaoe1968.1992.172_589
  • 出版社:The Japan Society of Naval Architects and Ocean Engineers
  • 摘要:

    In the first report, we proposed a fatigue crack propagation parameter Δ KRP from the view point of the appearance of cyclic tensile plastic zone at a crack tip in replace of Δ Keff based upon the crack opening load. Moreover the automatic measuring system was developed for the purpose of obtaining the re-tensile plastic zone's generated load (RPG load) as well as crack opening load and crack closing load during fatigue crack propagation. In this report, fatigue crack propagation tests of CT specimens were carried out with various stress ratios of constant amplitude loadings. Moreover Δ Kth tests with the conditions of constant stress ratio and constant maximum load with increasing stepwise minimum load were also carried out. These tests were conducted by using above developed system. It becomes clear that Δ KRP gives the quantitative effect of stress ratio on fatigue crack growth rate and the relation of logarismic Δ KRP and logarismic crack propagation rate appears to be linear in the wide range from very slow crack growth rate region to stable crack growth region. On the other hand, threshold phenomenon appears only circumstantially due to the paticular loading pattern on Δ Keff based on the crack opening load and Δ Keffcl based on the crack closing load.

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