JP5007461B2 - 金属材料の長寿命疲労強度設計法 - Google Patents
金属材料の長寿命疲労強度設計法 Download PDFInfo
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- JP5007461B2 JP5007461B2 JP2011175147A JP2011175147A JP5007461B2 JP 5007461 B2 JP5007461 B2 JP 5007461B2 JP 2011175147 A JP2011175147 A JP 2011175147A JP 2011175147 A JP2011175147 A JP 2011175147A JP 5007461 B2 JP5007461 B2 JP 5007461B2
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σ=1.56(HV/9.8+120)/(√area'max *)1/6((1−R)/2)α
(但し、σ:使用想定応力繰り返し数に応じた許容応力(MPa)、HV:ビッカース硬さ(MPa)、R:応力比(=最小応力/最大応力)、α=0.226+HV/9.8×10-4とする)を用いることができる。
図3は使用材料に含まれる介在物の極値統計分布を示す図、図4はODAの成長と破断までの応力繰り返し数Nfとの関係を示す図、図5は実際の機械部品の寸法、生産量および設計寿命に応じた最大欠陥寸法の決定手順を示す図である。
σ=1.56(HV/9.8+120)/(√area')1/6((1−R)/2)α
ここで、σ:使用想定応力繰り返し数に応じた許容応力(MPa)、HV:ビッカース硬さ(MPa)、R:応力比(=最小応力/最大応力)、α:0.226+HV/9.8×10−4である。そして、等価欠陥寸法√area'として上で決定したODAを含めた最大等価欠陥寸法√area'max *(μm)を入力し、使用想定応力繰り返し数に応じた許容応力(MPa)を算出する。
Claims (1)
- 周囲に水素をトラップした非金属介在物を含む金属材料の長寿命疲労強度設計法であって、
疲労試験結果から破断までの応力繰り返し数と前記トラップした水素が影響を及ぼしている非金属介在物の周囲の水素影響領域の寸法との関数関係を、前記破断までの応力繰り返し数Nfおよび前記金属材料に含まれる非金属介在物のうち破断起点となった非金属介在物の面積A0と前記水素影響領域の面積A1とを合わせた面積A0+A1の平方根で表した等価欠陥寸法√area'に対する前記破断起点となった非金属介在物の面積A0の平方根で表した介在物の初期寸法√areaの比√area'/√areaをそれぞれ軸にとってプロットしたグラフに基づいて求める第1のステップ、
前記金属材料を用いる機械部品の使用想定応力繰り返し数に対応する非金属介在物の拡大後の寸法である等価欠陥寸法を前記関数関係により求めるに際し、前記グラフのNf軸上に前記使用想定応力繰り返し数をとって前記関数関係により対応する√area'/√area軸上の値を求めることにより介在物の初期寸法√areaに対する等価欠陥寸法√area'を求める第2のステップ、
前記等価欠陥寸法を許容応力などの超長寿命疲労強度の算定に使用して前記機械部品を設計する第3のステップからなることを特徴とする金属材料の長寿命疲労強度設計法。
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Cited By (1)
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CN110849753A (zh) * | 2019-12-09 | 2020-02-28 | 大连理工大学 | 一种基于微观划痕的金属材料疲劳强度预测方法 |
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JP6408222B6 (ja) * | 2014-01-24 | 2018-12-05 | 日本精工株式会社 | 転がり支持装置や動力伝達装置用構成部品の疲れ寿命予測方法 |
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US3957450A (en) * | 1973-01-15 | 1976-05-18 | General Electric Company | Article of manufacture with pre-determined fatigue life |
US5419201A (en) * | 1993-02-25 | 1995-05-30 | Li; Yuanfeng | Methods and devices for electrochemically determining metal fatigue status |
US6026691A (en) * | 1995-06-30 | 2000-02-22 | University Of Pennsylvania | Methods and devices for electrochemically determining metal fatigue status |
JPH11230961A (ja) * | 1998-02-18 | 1999-08-27 | Nireco Corp | 材料中の最大欠陥又は最大介在物予測方法と装置 |
US6704664B2 (en) * | 2001-12-18 | 2004-03-09 | Visteon Global Technologies, Inc. | Fatigue sensitivity determination procedure |
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CN110849753A (zh) * | 2019-12-09 | 2020-02-28 | 大连理工大学 | 一种基于微观划痕的金属材料疲劳强度预测方法 |
CN110849753B (zh) * | 2019-12-09 | 2020-09-29 | 大连理工大学 | 一种基于微观划痕的金属材料疲劳强度预测方法 |
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