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25
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2024-09-01
10:52 集計
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Permalink : https://hdl.handle.net/10114/4630
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T_Matsumoto
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学位論文
タイトル
軸力‐ねじりの組合せ応力下におけるき裂成長挙動に基づく疲労寿命評価法
その他のタイトル
Estimation of fatigue life based on crack growth behavior under combined axial and torsional stresses
著者
著者名
松元, 太朗
著者名
MATSUMOTO, Taroh
言語
jpn
発行年
2009-03-24
著者版フラグ
Not Applicable (or Unknown)
学位授与年月日
2009-03-24
学位名
修士(工学)
学位授与機関
機関名
法政大学 (Hosei University)
内容記述
工学研究科機械工学専攻; 指導教授: 大川功
抄録
Fatigue is known to be cause of many mechanical failures. The structure and machine parts are generally subjected to cyclic multiaxial loadings, even if structures are subjected to simple uniaxial loadings. Fatigue structures are considered as dangerous part in multiaxial stress state because of complex shape. In such cases, as fatigue lives of machines under multiaxial stresses were predicted, various criterions were proposed. First, the methods of yield and strength theory for static loadings were fatigue case was proposed. But, it was necessary to decide material constants. Therefore, this theory didn’t accord with various materials. Next, experience theory for combination of stresses was proposed. But, this theory based on fatigue tests, there was no physical ground. Afterward, the theory based on crack initiation and growth was proposed. As fatigue structures were initiated by crack initiation and growth under cyclic loadings, fatigue life was dominated stresses and strains on this crack initiation and growth plane. Thus, theory based on crack initiation and growth is best and high adaptability is considered. Therefore, criterion for crack initiation and growth behavior was needed. Generally, crack initiation and growth process have demonstrated that crack of 10~100μm develop into a ModeⅡ(shear dominated), otherwise branch into ModeⅠ(tension dominated) crack which leads to final failure. In this study, prediction method applicable for out-of-phase combined axial and torsional stresses with mean stress was proposed. And fatigue tests of carbon steel, aluminum alloy and stainless steel with prediction method of lifetime were compared. In result, predicted life under combination of axial and torsional stresses with phase difference and mean stress was available if result of fatigue life tests under axial and torsional stress was known. It was shown that predicted lives by the criterion were well correlated with actual lives for various materials and loading conditions. And, it was found that prediction accuracy of this criterion was higher than other prediction method of life.
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