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ON FATIGUE CRACK PATH DEVIATION AT ELEVATED TEMPERATURE IN ELECTRON BEAM REPAIRED WELDMENTS OF TURBINE DISK L.H.Li1,Y.H.Zhang1,X.A.Zhang2,H.Y.Zhao3,H.Q.Zhang3 (1.School of Mechanical Engineering... of the inhomogeneity of mechanical performance on fatigue crack growth (FCG) rate and crack path deviation (CPD). The base metal served in a turbine disk of aerospace engine was selected to fabricate......
. And the results show that the under-aged sample possesses the best resistance to fatigue crack propagation and the most tortuous and bifurcated crack path. For all samples, the fatigue crack growth rate in the rupture region was inversely proportional to yield strength. Key words: Al–Zn–Mg–Sc–Zr alloy; annealing treatment; microstructures; fatigue crack growth rate; fatigue crack path Cite this article......
Influences of microstructure and texture on crack propagation path of X70 acicular ferrite pipeline steelHao Yu School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China摘 要:The aspects of two pipeline steels with different technologies were investigated by using transmission electron microscopy (TEM......
. Quantitative evaluation of indentation cracks indicates that the crack deflection plays a more effective role. Cracks of the ATC composites show higher deflection angles and more deflections along the path. ATC composites present higher fractal dimension (D=1.07) than AT composites (D=1.02), which is directly related to the higher fracture toughness. A significant relationship between crack path......
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of internal cracks in side beam specimens are experimentally studied by inserting double internal cracks. The effects of crack positions on the fracturing path in the bridge areas of the double cracked beam... beam specimens under three-point bending by using a damage model. They analyzed the effects of crack location and coarse aggregate distribution on damage evolution behavior and crack propagation path......
amplitude is small, which is local region crack growth. The coalescence path is simple, specimen coalesces horizontally in form of wing crack, secondary shear crack between horizontal pre-cracks... mode is wing crack+secondary shear crack between horizontal pre-cracks. When the specimen is embedded with six pre-cracks, crack propagation path is single. The crack propagates downward in form......
显微组织对TC4ELI合金疲劳裂纹扩展路径及扩展速率的影响马英杰1,李晋炜1,雷家峰1,唐振云2,刘羽寅1,杨锐2(1.辽宁省沈阳市科学院金属研究所2.中航工业北京航空制造工程研究所)摘 要:利用SEM观察了疲劳裂纹在具有片层组织的TC4ELI合金中的扩展路径,通过统计疲劳裂纹与α片层所呈的角度,分析了α和β两相晶体学取向对疲劳裂纹扩展路径的影响.基于对疲劳裂纹扩展路径的研究,测试并讨论了片层组织中晶粒和α片层对近门槛值阶段及Paris区阶段疲劳裂纹扩展速率的影响.研究表明,疲劳裂纹在片层组织中扩展时,疲劳裂纹......
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block number remains unchanged in case 8-2, as shown in Figures 5 and 6. 4 Cover renewal strategy Once the crack propagation path is determined, the cracking MEs and associated cracking PPs would... starts with tracking the crack tips and its neighboring MEs. Once the propagation path is given, the targeting MEs and its associated PPs will be renewed according to the position of the crack tip. Note......