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strength is determined as 65 MPa under 106 cycling of fatigue life.The microstructure of joints is fine grains and narrow HAZ zone in FSW welds,which inhibit the growth of cracks and produce high fatigue...Comparison of fatigue property between friction stir and TIG weldsXunhong Wang~(1)) Kuaishe Wang~(2)) Yang Shen~(2)) Kai Hu~(3)) 1)Cold Rolling Plant,Baosteel Branch,Shanghai 200941,China 2)School......
in Fig.1. The arrows indicate that the specimens are not failure during fatigue tests. Fatigue strength at the 107th cycle is usually defined as the fatigue limit. As can be seen from Fig.1, S-N curves show...; (1) where σa is the alternating stress; σ′f is the fatigue strength coefficient; Nf is the number of cycles to failure; and b is the Basquin exponent. Values of σ′f......
fracture which happens before yielding. The fatigue strength obtained up to 107 cycles is found to decrease from approximately 1 538 MPa to 1000 MPa with the inclusion size increasing above 30 μm... to investigate the fatigue nucleation sites and the fatigue strength controlling flaws on the fracture surface, the size of which was represented by equivalent diameter of a circular-like defect. 3......
, as well as fatigue property of pervious cement concrete with either supplementary cementitious materials (SCMs) or polymer intensified, were analyzed. Test results show that the strength development of SCM... and at any stress level. It is proved that two-parameter Weibull probability function describes the flexural fatigue of pervious concrete.Key words:pervious concrete; strength; fracture; fatigue life......
between defect features and the fatigue strength needs to be established through a good understanding of the fatigue damage mechanisms associated with the microstructural features under specific loading... components [10]. The fatigue strength of cast Al alloys is profoundly affected by different types of microstructural heterogeneities such as micro- shrinkage/gas defects/pores, gas porosity and eutectic phases......
10 January 2011 Abstract: Empirical relationship was developed to predict the fatigue life of gas metal arc welded (GMAW) cruciform joints failing from root region. High strength, age hardenable... metal arc welding; cruciform joint; fatigue life 1 Introduction High strength Al-Zn-Mg-Cu aluminium alloys have gathered wide acceptance in the fabrication of light weight structures requiring......
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.随着应力比的增加,疲劳裂纹扩展速率均呈增大趋势.裂纹尖端塑性区内的第二相粒子与基体的不协调塑性变形可促进疲劳裂纹的扩展,影响疲劳裂纹的扩展速率.关键词:高强铝合金；焊接接头；第二相粒子；疲劳裂纹扩展Fatigue crack propagation characteristics of high strength aluminum alloy welded joint used by high... growth rate of it.Key words:high strength aluminum alloy; welded joint; secondary phase precipitate; fatigue crack propagation......
performance of high-strength concrete (HSC), which could be used as cover of reinforcement of segment, was investigate by three-point load bending tests. Also, the flexural fatigue equations of high... strength of segment concrete, and the important is that it can markedly increase the flexural fatigue performance of the HSC subjected to cyclic bending load. Especially when with 1.37 kg/m3 addition......
; 文献标志码:A Effects of heat treatment on high cycle fatigue strength of TA15 alloy LAI Yun-jin1, 2, ZHANG Feng-shou2, DU Yu-xuan2, HOU Yan-rong2, WANG Yong-zhe2, MA Wen-ge2, LIU Xiang-hong2, FENG..., China) Abstract: The effects of content of O element,heat treatment and α phase of TA15 alloys on high cycle fatigue strength of TA15 alloy bar with d18 mm were studied. The results show......
