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低合金钢微缺陷的裂纹萌生扩展规律 被引量:4

Crack Initiation and Propagation of Small Defects in Low Alloy Steel
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摘要 采用宏观与微观结合的方法以及大型疲劳试验机和光学显微镜研究了压力容器用钢16MnR在低周疲劳下微孔(φ40~200μm)的裂纹萌生与扩展规律。结果表明:裂纹的萌生机制为滑移带启裂,由剪应力起主要作用,微观缺陷尺寸、应力水平对疲劳寿命有显著影响,当应力水平较低时,微孔尺寸对疲劳寿命的影响明显;当应力水平较高时(超过屈服强度),孔径对疲劳寿命的影响不敏感;在同一应力水平下,微缺陷尺寸d存在临界值dt,当d>dt时,疲劳寿命下降很多。 A fatigue test for micro-crack development was performed with a microscope and a large fatigue testing machine,combined with macro-analysis and microscopic examination.The crack initiation and propagation of small holes and the size effects of small defects on low cyclic fatigue of steel bar were investigated.The specimens chosen was 16MnR steel,normally for fabricating pressure vessels in China,with drilled holes of different sizes from 40 to 200 in diameter.It has been observed that one type of crack init...
出处 《机械工程材料》 CAS CSCD 北大核心 2008年第2期18-20,48,共4页 Materials For Mechanical Engineering
关键词 微孔 低周疲劳 裂纹萌生 裂纹扩展 crack initiation crack propagation small crack low cycle fatigue
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  • 1[1]Klesnil M Lukasp,Polak J.Cyclic deformation and fatigue of metals[M],imsterdam[s,n],1993:40-45.
  • 2马骏,孙毅.金属材料疲劳损伤的宏细观理论[J].力学进展,2002,32(3):391-401. 被引量:18
  • 3[3]Miller K J.The behavior of short fatigue eracks[M].Lon-don:Mechanical Engineering Publications Ltd,1996:1-7.
  • 4[4]Ritchie R O,Lankford J.Small Fatigue Craeks[M].Califor-nia:The Metallurgical Society,1996:1-11.
  • 5[5]Zhixue W,Wenge L,Hao X.Study on fatigue damage below the fatigue limit and the coating effects[J].ACTA Metallurgi-cal Sinica,2003,9(3):227-231.
  • 6[6]Miller K J,Mohamed H J.Barriers m Short Fatigue Crack Propagation at Low Stress Amplitudes in a Banded Ferrite-peerlite Structure[M].U K:Uuniversity of Sheffield,2000.
  • 7[7]MillerKJ.Short crack problem[J].Fatigue Eng Mater Structure,2002,5 (3):223-232.
  • 8[8]Muraksmi Y,Harada S,Fukushima Y.Correlations among growth law of small cracks,low-cycle fatigue law and applica-bility of Miner' s Rule[J].Eng Fraet Mech,2003,18 (5):909-924.
  • 9[9]Murakami Y.Relationship Between the Low-Cycle Fatigue Law and the Growth Law of Small Cracks in 70/30 Brass[M].U K:Uuniversity of Sheffield,2000.
  • 10[10]Murakami Y,Endo T.Effects of small defects on fatigue strength of metals[J].Int J Fatigue,2004,2(1):23-30.

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