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. In contrast, the fatigue strength of the coarse-grain alloy was 0.32 at the same cycles, although the fatigue strengths in the range from 103to 105 cycles are the same for both alloys. The fracture... the fine- and coarse-grain alloys could be explained in terms of the sizes of the facets from which the fractures originated. Key words:aerospace material; fatigue; high temperature; internal fracture......
Torsional Fatigue Cracking and Fracture Behaviors of Cold-Drawn Copper:Effects of Microstructure and Axial StressRong-Hua Li1,Peng Zhang2,Zhe-Feng Zhang21. School of Mechanical Engineering,Liaoning Shihua University2. Laboratory of Fatigue and Fracture for Materials,Institute of Metal Research,Chinese Academy of Sciences摘 要:The fatigue cracking......
Fracture morphology and crack mechanism in pure polycrystalline magnesium under tension-compression fatigue testingLi Tan1,Xi-Yan Zhang1,Ting Xia1,Guang-Jie Huang1,Qing Liu1,21. College of Materials Science and Engineering,Chongqing University2. National Engineering Research Centre for Magnesium Alloy,Chongqing University摘 要:The fatigue fracture......
; high temperature fatigue; fracture 1 Introduction Automobile industry is one of the pillar industries for national economy in many countries [1,2]. With the development of technology and increasing...-temperature alternating loads, a part is prone to have fatigue fracture, which seriously affects the life and reliability of the part [6-10]. Therefore, the study on enhancing the high-temperature......
Ultrahigh cycle fatigue fracture mechanism of high-quality bearing steel obtained through different deoxidation methodsWei Xiao1,Yan-ping Bao1,Chao Gu1,Min Wang1,Yu Liu2,Yong-sheng Huang2,Guang-tao... portion of the cracks in Si-deoxidized steel could be attributed to different types of inclusions. The mechanisms of fatigue fracture caused by calcium aluminate and silicate inclusions were further......
Mechanism of high-temperature oxidation effects in fatigue crack propagation and fracture mode for FGH97 superalloyChao Xu,Zhi-Hao Yao,Jian-Xin Dong,Yu-Kun JiangSchool of Materials Science... experiments were conducted at 700 and 300 ℃,respectively.The results indicate that the reduction of the fatigue lifetime for FGH97 takes place when the fracture mechanism transforms from a predominantly......
]. Fig.3 Influences of texture type on sheet fatigue strength Table 4 Fatigue strengths of sheets in different texture types at 5×106 cycles 3.5 Fatigue crack propagation path and fracture surface The fatigue crack propagation path and fracture surface in fatigue specimens are shown in Figs.4 and 5. Fig.4(a) shows that the crack propagation path possesses much flattens where the specimen......
, σmax and σmin are the maximum and minimum applied stress, respectively. Crack initiation and small crack growth were monitored with replication technique. After fatigue tests, the fracture surfaces were... crack growth behavior of fatigue tested L-specimen at σa=110 MPa: (a) Crack growth rate; (b) Small crack growth path; (c) Fracture surface Fig.6 Fatigue crack growth behavior of fatigue tested T......
, 21(6): 2366–2371. [3] MAI S H, NGUYEN-TAJAN M L, VERRIER A, ETIENNE B. Fatigue crack growth in the contact wire of railway catenary [C]// 13th International Conference on Fracture. Beijing, China: ICF... performance and parameter optimization design of pantograph and catenary system [J]. Finite Elements in Analysis and Design, 2011, 47: 288–295. [23] CHEN Chuan-yao. Fatigue and fracture [M]. Whuhan......
topography and fatigue life. Based on the fatigue fracture, the effect mechanism of surface topography on the fatigue crack initiation was proposed. The experiment results show that when the milling... at the intersection edge of machined surface. Key words: TB6 titanium alloy; high-speed milling; surface roughness; surface topography; fatigue life; fatigue fracture 1 Introduction Among many high......
