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;Probability distribution for occurrence of surface and internal fatigue fracture modes[19] 2.2 超高周疲劳失效的断口特征及萌生机理 在低高周疲劳失效分析中,其断裂裂纹源均来自于试样表面,其机理为滑移造成材料表面的挤入与挤出,逐渐形成驻留滑移带PSB,由PSB发展成与主应力方向约成45°角的表面裂纹..."(Optically dark area, ODA),呈现"鱼眼"的形状,如图3(b)所示. 图3 超高周疲劳的断裂形貌[23-24] Fig. 3 Morphologies on fatigue fracture surface after very high cycle fatigue failure[23-24] 有关超高周疲劳裂纹源从试样表面转移到内部的机理研究很多......
; 文献标志码:A 文章编号:1672-7207(2021)07-2386-08 A unified evaluation method for intermediate and low temperature fracture performance of asphalt concrete SONG Weimin, XU Zihao, WU Hao, XU Fei, ZHAN Yiqun (School of Civil Engineering, Central South University, Changsha 410075, China) Abstract: To evaluate the fracture toughness of asphalt concrete......
steel[J]. Engineering Fracture Mechanics, 2015, 144: 1-15. [19] ZHU M L, XUAN F Z, WANG G Z. Effect of microstructure on fatigue crack propagation behavior in a steam turbine rotor steel[J]. Materials...]. Intermetallics, 2010, 18(1): 161-172. [7] 孙 才. 高温热暴露的γ-TiAl基合金表面微裂纹萌生行为与疲劳寿命的研究[D]. 成都: 西南交通大学, 2013. SUN Cai. Study of surface microcrack initiation and fatigue life for a thermal-exposured γ-TIAL based alloy[D......
-cycle fatigue properties and fracture behavior of Ti-5Al-5Mo-5V-1Cr-1Fe titanium alloy [J]. Rare Metal Materials and Engineering, 2018, 47(12): 3666-3671. [4] FU Yu-can, Ge Ende, SU Hong-hua, XU Jiu... Bo, LI Chen. Fatigue fracture characteristics of high-strength 7050-T7451 aluminum alloy thick plates[J]. Materials for Mechanical Engineering, 2013, 37(06): 26-30. Effect of hole extrusion on fatigue......
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Residual stress relaxation in typical weld joints and its effect on fatigue and crack growth Chunyan JI1,Zhengquan WAN2,Liangbi LI1,Zili WANG1 (1.School of Naval Architecture and Ocean Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China;2.China Ship Scientific Research Center,Wuxi 214082,China) Abstract:Many factors influence the fatigue and crack growth behavior......
fatigue strength and crack propagation rate. On the other hand, new methods were proposed based on fractal dimension [19] or fracture mechanics [20-22]. Relevant analytical softwares, such as NASGRO... experiment. Moreover, an entire region FCP model based on fracture mechanics was formulated to predict the fatigue life of pre-corroded aluminium alloy. The predicted results were eventually verified......
两种不同冶金工艺生产的60Si2CrVA弹簧钢的高周疲劳性能郝立群1,2,惠卫军2,项金钟0,惠荣3,翁宇庆1(1.云南省昆明市云南大学物理科学技术学院2.北京市钢铁研究总院先进钢铁材料技术国家工程研究中心3.江阴兴澄特种钢铁有限公司,江苏江阴 214429)摘 要:采用旋转弯曲疲劳试验研究了两种不同冶金工艺生产的60Si2CrVA弹簧钢的高周疲劳破坏行为.结果表明,尽管两种试验料的氧含量接近,但两者夹杂物特征的差异使其疲劳性能存在明显的差异.与采用电炉+LF+VD+CC工艺生产的X8料相比,采用转炉+LF+R......
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..., Tsinghua University, Beijing 100084, China) Abstract:Fatigue crack growth behaviors in electron beam weldments of a nickel-base superalloy are studied. The objective of this paper is to discuss effects......
弯曲疲劳断口形貌 图8 Fe-Mn-Si记忆合金和304不锈钢疲劳断口的微观形貌 Fig. 8 Microstructure of fatigue fracture inside Fe-Mn-Si alloy(a) and 304 stainless steel(b) 为进一步分析试样弯曲疲劳断裂特性,采用场发射扫描电子显微镜观测到Fe-Mn-Si记忆合金和304不锈... Press, 2006: 243. [3] SEIFI M, SALEM A, SATKO D, SHAFFER J, LEWANDOWSKI J. Defect distribution and microstructure heterogeneity effects on fracture resistance and fatigue behavior of EBM Ti-6Al-4V[J......
