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PRE-CORROSION FATIGUE NOTCH FACTOR 被引量:1
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作者 张川 姚卫星 余建航 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2011年第4期331-336,共6页
The notched and smooth specimens of aluminum alloy LC4CS soaked in EXCO solution for different time are tested under the constant amplitude cyclic loading to obtain S-N curves and fatigue notch factors with different ... The notched and smooth specimens of aluminum alloy LC4CS soaked in EXCO solution for different time are tested under the constant amplitude cyclic loading to obtain S-N curves and fatigue notch factors with different pre-corrosion time. By analyzing the corrosion process of LC4CS specimens in EXCO solution, the influ- ence mechanism of corrosion on fatigue notch factor is expounded. Then, a two-parameter model used to describe the change of corrosion fatigue notch factor with time is established and verified by experiment. The results show that the pre-corrosion fatigue notch factor of LC4CS material decreases at first and then increases with the increasing pre-corrosion time. The inflection point appears at the beginning of denudation stage. 展开更多
关键词 pre-corrosion EXCO solution fatigue notch factor LC4CS fatigue experiments
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Effect of Pre-corrosion on Fatigue Life of High Strength Steel 38CrMoAl 被引量:5
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作者 刘建华 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2011年第4期648-653,共6页
The effect of pre-corrosion on fatigue behavior of high strength steel 38CrMoAl was investigated with a fatigue test method using the accelerated pre-corrosion specimen in the neutral salt spray environment. The metho... The effect of pre-corrosion on fatigue behavior of high strength steel 38CrMoAl was investigated with a fatigue test method using the accelerated pre-corrosion specimen in the neutral salt spray environment. The methods of weight-loss and energy dispersive spectrum (EDS) were adopted. The corrosion weight-loss rate was fitted with the test time using power law, and the relationship between the corrosion weight-loss rate and the time was formulated. Moreover, the fatigue behaviors of the steel for different pre-corrosion time were investigated by the axis-direction tensile fatigue test. The fatigue life distribution characteristics of the pre-corrosion specimens were studied using the statistical probability methods, and the mathematical expectations and the standard tolerances of the material fatigue lives after different pre-corrosion time were obtained. It was found that the crack initiation of the high strength steel was accelerated by the preferential corrosion at the local plastic deform areas. The fatigue life obeys the lognormal distribution perfectly. Furthermore, within the common time range of the engineering, the standard tolerances of the logarithm of the fatigue life were independent of the pre-corrosion time. 展开更多
关键词 pre-corrosion fatigue life 38CrMoAl steel
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Simulation of Damage Evolution and Study of Multi-Fatigue Source Fracture of Steel Wire in Bridge Cables under the Action of Pre-Corrosion and Fatigue 被引量:2
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作者 Ying Wang Yuqian Zheng 《Computer Modeling in Engineering & Sciences》 SCIE EI 2019年第8期375-419,共45页
A numerical simulation method for the damage evolution of high-strength steel wire in a bridge cable under the action of pre-corrosion and fatigue is presented in this paper.Based on pitting accelerated crack nucleati... A numerical simulation method for the damage evolution of high-strength steel wire in a bridge cable under the action of pre-corrosion and fatigue is presented in this paper.Based on pitting accelerated crack nucleation theory in combination with continuum mechanics,cellular automata technology(CA)and finite element(FE)analysis,the damage evolution process of steel wire under pre-corrosion and fatigue is simulated.This method automatically generates a high-strength steel wire model with initial random pitting defects,and on the basis of this model,the fatigue damage evolution process is simulated;thus,the fatigue life and fatigue performance of the corroded steel wire can be evaluated.A comparison of the numerical simulation results with the experimental results shows that this method has strong reliability and practicability in predicting the fatigue life of corroded steel wire and simulating the damage evolution process.Based on the method proposed in this paper,the fatigue life of steel wires with different degrees of corrosion under the action of different stress levels is predicted.The results show that as the degree of corrosion increases,the fatigue properties of steel wire gradually decrease,and the influence of existing pitting corrosion on fatigue life is far greater than that on mass loss.Stress concentration is the main cause of fatigue life of corroded steel wire in advance attenuation.In addition,the fracture process of steel wire with multi-fatigue sources and the effect of the number and distribution of pits on the fatigue life of steel wire are studied.The results show that,compared with a stepped pitting distribution,a planar pitting distribution has a greater impact on the damage evolution process.The fatigue life of steel wire is positively correlated with the number of pits and the angle and distance between pits. 展开更多
关键词 Steel wire damage evolution pre-corrosion and FATIGUE multi-fatigue SOURCE FRACTURE cellular AUTOMATA
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Research on Fatigue Curves for Pre-corroded Aircraft Structures 被引量:2
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作者 王忠波 刘文珽 贺小帆 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2004年第4期220-223,共4页
To quantitatively evaluate the effects of corrosion during grounding onfatigue life of aircraft structures, a new power equation is proposed using two-variable linearregression method. That the slope is a constant and... To quantitatively evaluate the effects of corrosion during grounding onfatigue life of aircraft structures, a new power equation is proposed using two-variable linearregression method. That the slope is a constant and the logarithmic intercept is a linear functionof pre-corrosion time makes this equation advantageous: it has a simple form, its parameters haveunambiguous technical and geometrical meanings, and it facilitates engineering applications.Three-parameter equations after pre-corrosion are obtained from back-calculation of fatigue limits,which have been successfully used to predict safe life of aircraft structures in corrosiveenvironment. 展开更多
关键词 fatigue life pre-corrosion fatigue curve regression analysis lifeprediction CORROSION
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Studying the Impact of Anions Pre-generated Iron Corrosion Products on the Efficiency of Contaminant Removal in Fe0/H2O Systems
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作者 Cornelius Tsamo Djibrine Sali Meali Hippolyte Todou Assaouka 《Journal of Environmental Science and Engineering(B)》 2018年第1期1-10,共10页
The effects of Fe0 pre-corrosion by water,bicarbonate,chloride,phosphate and sulfate on the efficiency of Fe0 systems for water treatment were investigated.Batch experiments were conducted for a total duration of 72 d... The effects of Fe0 pre-corrosion by water,bicarbonate,chloride,phosphate and sulfate on the efficiency of Fe0 systems for water treatment were investigated.Batch experiments were conducted for a total duration of 72 days with MB(Methylene Blue)and MO(Methyl Orange).The efficiency of used Fe0 was assessed by characterizing the extent of MB and MO discoloration,pH variation and amount of iron released as a function of anion type.Before dye addition,used Fe0 in Fe0/sand and 100%Fe0 systems was allowed to equilibrate with H2O or the anionic solution for 0 to 44 days.Pre-corrosion has low impact on MB discoloration but has negative impact on MO discoloration.Relative to the reference system(anion free system,H2O),all the tested anions enhanced MB discoloration but decreased that of MO.HPO4 2-and HCO3-severely affects MO discoloration.The pH of the medium governs the discoloration with MB performing better at higher pH and MO doing same at lower pH.For MB,Fe0/sand system shows higher efficiency than 100%Fe0 system.But the two systems show similar efficiency for MO.Results will help in the design and functioning of Fe0 based filtration systems and other water treatment designs using Fe0. 展开更多
关键词 Corrosion PRODUCTS DYE DISCOLORATION major ANIONS pre-corrosion zero-valent iron
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