材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
アルミニウム合金の二段多重変動荷重下での疲労き裂進展挙動について
変動荷重レベルがともに疲労き裂進展曲線の第II領域にある場合
田中 道七加藤 泰世中山 英明
著者情報
ジャーナル フリー

1987 年 36 巻 411 号 p. 1368-1374

詳細
抄録

Aluminum alloy (A2017-T3) compact tension specimens were tested under repeated two-step load conditions, and the crack growth rate and crack closure behavior were observed. The higher and lower stress levels, KH and KL, were selected in the region II of the crack growth rate curve of the material obtained by ΔK increasing tests. It was found that the crack growth rate da/dN and crack opening stress intensity Kop were affected by the stress cycle ratio KL/NH; namely, da/dN was decreased and Kop was raised by the increase of NL/NH. The estimation of the crack growth rate for lower stress level KL by the linear cummulative law shows that the estimated relation of (da/dN)L versus (Keff)L was in better agreement with the fundamental crack growth rate curve when the crack closure only in the repetition of KL was taken into account, than when the closure at both stress levels of KH and KL were considered.

著者関連情報
© 日本材料学会
前の記事 次の記事
feedback
Top