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  • 标题:鋼材の低サイクル疲労に関する研究 (第1報) 低サイクル疲労における断面収縮型破壊
  • 本地全文:下载
  • 作者:八木 順吉 ; 冨田 康光 ; 福岡 哲二
  • 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:1973
  • 卷号:1973
  • 期号:133
  • 页码:201-208
  • DOI:10.2534/jjasnaoe1968.1973.201
  • 出版社:The Japan Society of Naval Architects and Ocean Engineers
  • 摘要:

    A Method for prediction of the life of necked-out type fatigue fracture under low cyclic loading was proposed. Practically, in case of the necked-out type fatigue fracture, it may be assumed that fatigue life has been used up when necking began. In such a case, when accumulated permanent strain, ε m , amounts to critical value, ε us , the fatigue failure occurs, and the critical value is nearly equal to the general elongation of material, ε u 0. Then a relation between strain and number of cycles is expressed approximately as follows; Δε m · Nusus0 u 00 where Δε m is a cyclic creep rate at the stationary stage which occupied major part of whole fatigue life, Nus is number of cycles to the fatigue failure and ε0 is a permanent strain at the first cycle. The cyclic creep rate Δε m is correlated to nominal maximum stress, σmax, and stress ratio, R , and the following relation is assumed. (σ B max) /σ Y = (∑ Ai · Ri ) ·Δε m β Constants, Ai , and exponent, β, in the above equation are able to be obtained from statical test results. In order to prove the validity of these equations, mild steel specimens were tested under constant repeated axial loads with several stress ratios, and the test results were compared with the values calculated by the equations, and fairly good agreements between them were obtained.

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