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Effects of precipitates on fatigue crack growth rate of AA 7055 aluminum alloy CHEN Jun-zhou(陈军洲) 1, ZHEN Liang(甄 良) 2, YANG Shou-jie(杨守杰)1, DAI Sheng-long(戴圣龙)1 1. Beijing Institute...: The effects of precipitates on the fatigue crack growth rate of AA 7055 Al alloy subjected to different ageing treatments were investigated using transmission electron microscope and fatigue crack......
A NOVEL PARAMETER FOR EVALUATING THE FATIGUE CRACK GROWTH RATE IN CARBON STEELS H.Nisitani1,S.Q.Zhu2,N.KAWAGOISHI3,X.S.WANG2 (1.Faculty of Engineering,Kyushu Sangyuo University,Fukuoka,812,Japan... for evaluating the fatigue crack growth rate in carbonsteels.Fatigue crack propagation tests of an annealed 0.42% carbon steel were carriedout under different conditions to investigate the relationship between......
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time, alloy chemistry, and alloy microstructure on damage zone and the crack growth behaviors are studied.Hold-time usually increases the alloy''s FCP rate, but there are few exemptions.For instance.... Key words:Ni-base superalloys; fatigue crack growth; hold-time; [全文内容正在添加中] ......
of pre strain material is higher than that of the material without undergoing pre-strain, but pre-strain can not make the increase of the growth rate of fatigue crack. Fatigue crack growth rates... the mechanical property of aluminum alloy[2-3]. Though pre-strain can improve the yield stress and tensile stress of alloy, the growth rate of fatigue crack can increase for the smaller plastic zone......
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200030, China) Abstract:Crack growth rate curves are the fundamental material property for metal structures under fatigue loading. Although there are many crack growth rate curves available... is able to explain various phenomena observed with particular strong capability on load sequence effect. Key words:metal fatigue; S-N curve; crack growth rate; general constitutive relation; mean......
(EBSD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), tensile and fatigue crack growth rate tests to explore the influence of annealing treatment on microstructure... region, fatigue crack growth rate, crack deflection and bifurcation, crack blunting and inter/trans-granular propagation were discussed based on data fitting and Laird model and Griffith theory......
Effects of stress ratios on fatigue crack growth of Ti40 alloy at 500 ℃ Fig.4 Relations between ΔK and R for Ti40 alloy at higher R-ratios Taking the FCG rate of 7×10-5 mm/cycle for example... Effect of stress ratio on fatigue crack growth of Ti40 alloy WU Huan(吴欢)1, 2, ZHAO Yong-qing(赵永庆)1, ZENG Wei-dong(曾卫东)2 1. Titanium Research Center, Northwest Institute for Non-ferrous Metal......
mechanism, respectively. In addition, a model for predicting the corrosion fatigue crack growth rate in welded joints of steel marine structures is established and crack growth mechanisms are analyzed. The results show that during early stages of crack growth, corrosion fatigue crack growth rate in welded joints is mainly controlled by corrosion action, whereas cyclic loading becomes more influential......
