Wöhler curve

Japanese: ウェーラー曲線 - うぇーらーきょくせん
Wöhler curve

… Fatigue tests (also called fatigue tests) can be classified into those that use smooth, i.e., unnotched test pieces to determine the fatigue limit, and those that use notched test pieces to measure crack growth behavior. When fatigue tests are performed using smooth test pieces with various values ​​for the difference between maximum and minimum stress (stress width), the relationship between the stress width σ a and the number of cycles N leading to fracture is called the S - N curve (Wöhler curve). An example is shown in the figure, where the curve is bent at N = 10 6 to 10 7.

*Some of the terminology that refers to the "Wöhler curve" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

… 疲労試験(疲れ試験ともいう)は,平滑な,すなわち切欠きのない試験片を用いて疲労限度を求めるものと,切欠きのある試験片を用いて亀裂進展挙動を計測するものとに分類できる。平滑な試験片を用いて,最大応力と最小応力との差(応力幅)をいろいろな値に変えて疲労試験を行ったとき,応力幅σaと,破壊に至る繰返し数Nとの関係をSN曲線(ウェーラー曲線)と呼ぶ。その例を図に示すが,N=106~107で曲線が折れ曲がっている。…

※「ウェーラー曲線」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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