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Research into Applicability of Wöhler Curve Method for Low-Cycle Fatigue of Metallic Materials
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作者 Xiangqiao Yan 《Journal of Harbin Institute of Technology(New Series)》 CAS 2024年第2期22-37,共16页
Recently,a description on a practicability of the Wöhler Curve Method for low-cycle fatigue of metals was given by the author.By the description and the low cycle fatigue test data of 16 MnR steel,it is important... Recently,a description on a practicability of the Wöhler Curve Method for low-cycle fatigue of metals was given by the author.By the description and the low cycle fatigue test data of 16 MnR steel,it is important to show that,for low cycle fatigue of metals,such a way that a stress-based intensity parameter calculated by the linear-elastic analysis is taken to be a stress intensity parameter,S,to establish a relationship between the stress intensity parameter,S,and the fatigue life,N,is practicable.In this paper,many metallic materials from the literature are given to show that the Wöhler Curve Method is well suitable for low-cycle fatigue analysis of metals. 展开更多
关键词 low cycle fatigue Wöhler curve method coffin-manson curve method METALS
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Reconstruction of probabilistic S-N curves under fatigue life following lognormal distribution with given confidence 被引量:2
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作者 赵永翔 杨冰 彭佳纯 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2007年第4期455-460,共6页
When the historic probabilistic S-N curves are given under special survival probability and confidence levels and there is no possible to re-test, fatigue reliability analysis at other levels can not be done except fo... When the historic probabilistic S-N curves are given under special survival probability and confidence levels and there is no possible to re-test, fatigue reliability analysis at other levels can not be done except for the special levels. Therefore, the wide applied curves are expected. Monte Carlo reconstruction methods of the test data and the curves are investigated under fatigue life following lognormal distribution. To overcome the non-conservative assessment of existent man-made enlarging the sample size up to thousands, a simulation policy is employed to address the true production where the sample size is controlled less than 20 for material specimens, 10 for structural component specimens and the errors matching the statistical parameters are less than 5 percent. Availability and feasibility of the present methods have been indicated by the reconstruction practice of the test data and curves for 60Si2Mn high strength spring steel of railway industry. 展开更多
关键词 fatigue probabilistic s-n curves RECONSTRUCTION Monte Carlo simulation
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Hardness-Based Non-destructive Method for Developing Location Specific S-N Curves for Fatigue Life Evaluation
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作者 Chaminda S. Bandara Sudath C. Siriwardane +1 位作者 Udaya I. Dissanayake Ranjith Dissanayake 《Journal of Civil Engineering and Architecture》 2016年第2期183-191,共9页
This paper first describes the importance of using location specific S-N curves for fatigue damage assessment of existing steel structures. It discusses the existing concepts and methods for developing S-N curves usin... This paper first describes the importance of using location specific S-N curves for fatigue damage assessment of existing steel structures. It discusses the existing concepts and methods for developing S-N curves using empirical formulae and monotonic strength parameters, such as the ultimate tensile strength and hardness. It also discusses relationships among these monotonic parameters. Then it presents formulae for developing hardness-based full range S-N curves for medium strength steels. The formulae are verified using experimental data obtained from both monotonic and cyclic testing. Finally, it describes the advantages of these hardness-based formulae for developing location specific S-N curves as hardness testing is a non-destructive test which can be carried out on specific locations in structures. 展开更多
关键词 Stress life curve fatigue life HARDNESS steel structures non-destructive test.
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Analysis Approach to Durability Based on Material Initial Fatigue Quality and S-N Curve 被引量:11
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作者 Yang Moucuna Nie Hong 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2007年第6期518-523,共6页
Based on probabilistic fracture mechanics approach, a new concept of material initial fatigue quality (MIFQ) is developed. Then, the relation between S-N curve and crack propagation curve is studied. From the study,... Based on probabilistic fracture mechanics approach, a new concept of material initial fatigue quality (MIFQ) is developed. Then, the relation between S-N curve and crack propagation curve is studied. From the study, a new durability analysis method is presented. In this method, S-N curve is used to determine crack growth rate under constant amplitude loading and evaluate the effects of different factors on durability and then the structural durability is analyzed. The tests and analyses indicate that this method has lower dependence on testing, and higher accuracy, reliability and generality and is convenient for application. 展开更多
关键词 probabilistic fracture mechanics approach DURABILITY s-n curve crack propagation rate initial fatigue quality
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Combine S-N curve and fracture mechanics for fatigue life analysis of welded structures 被引量:8
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作者 Wei Guoqian Odsuren Ochbileg +1 位作者 Yue Xudong Dang Zhang 《China Welding》 EI CAS 2019年第4期39-45,共7页
Based on the evolution of fatigue cracks in welded structures,the fatigue life of welded structures was defined as the sum of the crack initiation life Ni and the crack propagation life Np.Correspondingly,a fatigue-li... Based on the evolution of fatigue cracks in welded structures,the fatigue life of welded structures was defined as the sum of the crack initiation life Ni and the crack propagation life Np.Correspondingly,a fatigue-life analysis method combining S-N curves and fracture mechanics theory was proposed.The equivalent structural stress method and the lower 99%boundary of the master S-N curve were used to evaluate Ni,and cracks at the end of the initiation stage were considered as semi-elliptical surface cracks.Moreover,Paris equation and the stress intensity factor range of the cracks were used to evaluate Np.Furthermore,the fatigue test results obtained from the running girder of cranes were used as a reference for comparison and verification of the results.The results revealed that the equivalent structural stress is a good indicator for the crack initiation behavior of complex welded structures.In addition,the predicted fatigue life corresponded closely to the testing life. 展开更多
关键词 WELDED structures fatigue life EQUIVALENT structural stress s-n curvE fracture MECHANICS
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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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Structural Stress-Fatigue Life Curve Improvement of Spot Welding Based on Quasi‑Newton Method 被引量:2
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作者 Yahang Qin Shoune Xiao +3 位作者 Liantao Lu Bing Yang Xiangjie Li Guangwu Yang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2020年第2期140-151,共12页
ΔF-N curves are usually used to predict the fatigue life of spot welding in engineering,but they are time-consuming and laborious and not universal.For the purpose of predicting the fatigue life of spot welding accur... ΔF-N curves are usually used to predict the fatigue life of spot welding in engineering,but they are time-consuming and laborious and not universal.For the purpose of predicting the fatigue life of spot welding accurately and efficiently,tensile-shear fatigue tests were conducted to obtain the fatigue life of spot-welded specimens with different sheet thicknesses combinations.These specimens were simulated by using the finite element method,and the structural stress was theoretically calculated.In the double logarithmic coordinate system,the structural stress-fatigue life(S-N)curve of spot welding was fitted by the least-squares method,based on the quasi-Newton method.The square of the correlation coefficient of the S-N curve was taken as the optimization objective,with the correction coefficients of force,bending moment,spot welding diameter,and sheet thickness as the variables.During the optimization process,three different ways were utilized to get three optimized spot welding S-N curves,which are suitable for different situations.The results show that the fitting effect of the S-N curve is improved,the data points are more compact,and the optimization effect is significant.These S-N curves can be used to predict the fatigue life,which provide the basis for practical engineering application. 展开更多
关键词 Spot welding Structural stress s-n curve Quasi-Newton method Correction coefficient
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基于S-N曲线的汽车波纹管位移循环载荷寿命研究
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作者 赵熠辉 白永洁 +2 位作者 程文龙 束学道 李凯 《塑性工程学报》 CAS CSCD 北大核心 2024年第7期212-222,共11页
建立了汽车波纹管有限元模型,研究了位移循环载荷对汽车波纹管寿命的影响规律,探明了汽车波纹管不同结构参数与等效应力、应变和疲劳寿命之间的关系,并通过正交试验优化了波纹管结构参数。分析了疲劳失效后309S不锈钢汽车波纹管微观组... 建立了汽车波纹管有限元模型,研究了位移循环载荷对汽车波纹管寿命的影响规律,探明了汽车波纹管不同结构参数与等效应力、应变和疲劳寿命之间的关系,并通过正交试验优化了波纹管结构参数。分析了疲劳失效后309S不锈钢汽车波纹管微观组织。结果表明:随着位移循环载荷增大,波纹管疲劳寿命降低,疲劳寿命有限元结果和试验结果误差小于8.8%。增大波高、波距、波宽及减小壁厚有利于提高波纹管疲劳寿命,通过正交试验优化,等效应力由670.5 MPa减小到582.3 MPa,疲劳寿命由80060次增加到241450次。在水涨成形阶段,由于冷变形产生了部分马氏体,位移循环载荷作用下波纹管断裂处硬度接近200 HV,波峰处有明显的裂纹,其内部存在疲劳特征。 展开更多
关键词 汽车波纹管 疲劳失效 s-n曲线 微观组织
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GENERALIZED FATIGUE CONSTANT LIFE CURVE AND TWO-DIMENSIONAL PROBABILITY DISTRIBUTION OF FATIGUE LIMIT
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作者 熊峻江 武哲 高镇同 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2002年第10期1188-1193,共6页
According to the traditional fatigue constant life curve, the concept and the universal expression of the generalized fatigue constant life curve were proposed. Then, on the basis of the optimization method of the cor... According to the traditional fatigue constant life curve, the concept and the universal expression of the generalized fatigue constant life curve were proposed. Then, on the basis of the optimization method of the correlation coefficient, the parameter estimation formulas were induced and the generalized fatigue constant life curve with the reliability level p was given. From P-S-a-S-m curve, the two-dimensional probability distribution of the fatigue limit was derived. After then, three se, of tests of LY11 CZ corresponding to the different average stress were carried out in terms of the two-dimensional up-down method. Finally, the methods are used to analyze the test results, and it is found that the analyzed results with the high precision may be obtained. 展开更多
关键词 fatigue limit generalized constant life curve two-dimensional up-down method
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基于小样本量的航空发动机材料高低周复合疲劳P-S-N曲线优化方法
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作者 蔡培 袁辉 +2 位作者 徐鹤鸣 张屹尚 侯乃先 《材料工程》 EI CAS CSCD 北大核心 2024年第10期117-126,共10页
航空发动机材料的高低周复合疲劳P-S-N曲线是评估转子部件寿命的重要依据。然而,P-S-N曲线的确定对实验时间和材料成本均有较高的要求。基于物理信息机器学习方法,提出了基于小样本量的高低周复合疲劳P-S-N曲线的优化处理方法。该方法... 航空发动机材料的高低周复合疲劳P-S-N曲线是评估转子部件寿命的重要依据。然而,P-S-N曲线的确定对实验时间和材料成本均有较高的要求。基于物理信息机器学习方法,提出了基于小样本量的高低周复合疲劳P-S-N曲线的优化处理方法。该方法将等效寿命原理及寿命分布一致性判据通过损失函数引入极限学习机(ELM)模型,并考虑了上层输入变量和下层ELM模型参数的双层优化策略。随后通过应用疲劳实验数据,对比分析该方法与数据驱动机器学习方法以及传统P-S-N曲线拟合方法进行。结果表明:该方法不仅有效地解决了拟合过程中应力水平与高低周复合疲劳寿命标准差不呈线性关系的问题,且拟合得到的概率疲劳寿命分布与母体真值更为接近,具有较高的准确性。 展开更多
关键词 疲劳 P-s-n曲线 小样本 数据处理
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HRB400级钢筋母材疲劳性能试验及P-S-N曲线确定
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作者 李鑫 《建筑技术开发》 2024年第7期135-138,共4页
针对HRB400、HRBF4002种型号及16 mm、20 mm、25 mm、32 mm 4种不同直径的钢筋母材,研究了高强钢筋母材疲劳性能的试验,其应力比为0.4。通过试验结果对比分析不同直径对钢筋疲劳性能的影响,利用数据统计方法对试验结果进行了统计分析并... 针对HRB400、HRBF4002种型号及16 mm、20 mm、25 mm、32 mm 4种不同直径的钢筋母材,研究了高强钢筋母材疲劳性能的试验,其应力比为0.4。通过试验结果对比分析不同直径对钢筋疲劳性能的影响,利用数据统计方法对试验结果进行了统计分析并获得了S-N和P-S-N曲线。试验结果表明:对于HRB400与HRBF4002种型号的钢筋来说,其均具有随钢筋直径增大,钢筋母材的疲劳性能不断降低的规律;对比HRB400与HRBF4002种型号的钢筋母材疲劳性能发现,HRBF400级钢筋母材疲劳性能优于HRB400级;分析HRB400与HRBF4002种型号高强钢筋不同直径的总体数据样本,发现400级高强钢筋在中长寿命区的m值约为5.346,同时确定了总体样本下的P-S-N曲线,为400级高强钢筋在后续的疲劳设计及工程建设等方面提供了理论参考。 展开更多
关键词 HRB400级钢筋母材 HRBF400级钢筋母材 疲劳性能 P-s-n曲线
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A Model of the Fatigue Life Distribution of Composite Laminates Based on Their Static Strength Distribution 被引量:7
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作者 吴富强 姚卫星 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2008年第3期241-246,共6页
The reasons of the static strength dispersion and the fatigue life dispersion of composite laminates are analyzed in this article. It is concluded that the inner original defects, which derived from the manufacturing ... The reasons of the static strength dispersion and the fatigue life dispersion of composite laminates are analyzed in this article. It is concluded that the inner original defects, which derived from the manufacturing process of composite laminates, are the common and major reason of causing the random distributions of the static strength and the fatigue life. And there is a correlative relation between the two distributions. With the study of statistical relationship between the fatigue loading and the fatigue life in the uniform confidence level and the same survival rate S-N curves of material, the relationship between the static strength distribution and the fatigue life distribution through a material S-N curve model has been obtained. And then the model which is used to describe the distributions of fatigue life of composites, based on their distributions of static strength, is set up. This model reasonably reflects the effects of the inner original defects on the static strength dispersion and on the fatigue life dispersion of composite laminates. The experimental data of three kinds of composite laminates are employed to verify this model, and the results show that this model can predict the random distributions of fatigue life for composites under any fatigue loads fairly well. 展开更多
关键词 COMPOSITE static strength fatigue life s-n curve random distribution
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基于MSC Fatigue的脉动真空灭菌器疲劳分析 被引量:4
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作者 薛贵林 宇慧平 +3 位作者 隋允康 赵尔冰 杜家政 岳彩锐 《计算机辅助工程》 2008年第4期3-6,共4页
针对某些脉动真空灭菌器在未达到使用寿命时内壁就出现裂纹的问题,应用MSC Patran建立其有限元模型,调用MSC Nastran进行应力分析,然后应用MSC Fatigue软件进行疲劳分析.将所得寿命分析结果与实际工程使用情况比较,发现疲劳不是脉动真... 针对某些脉动真空灭菌器在未达到使用寿命时内壁就出现裂纹的问题,应用MSC Patran建立其有限元模型,调用MSC Nastran进行应力分析,然后应用MSC Fatigue软件进行疲劳分析.将所得寿命分析结果与实际工程使用情况比较,发现疲劳不是脉动真空灭菌器内壁产生裂纹的主要原因. 展开更多
关键词 脉动真空灭菌器 裂纹 疲劳分析 s-n曲线 有限元分析 MSC fatigue MSC PATRAN MSC NASTRAN
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WEIGHTED LEAST SQUARE METHOD FOR S-N CURVE FITTING 被引量:7
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作者 吉凤贤 姚卫星 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2004年第1期53-57,共5页
An S-N curve fitting approach is proposed based on the weighted least square method, and the weights are inversely proportional to the length of mean confidence intervals of experimental data sets. The assumption coin... An S-N curve fitting approach is proposed based on the weighted least square method, and the weights are inversely proportional to the length of mean confidence intervals of experimental data sets. The assumption coincides with the physical characteristics of the fatigue life scatter. Two examples demonstrate the method. It is shown that the method has better accuracy and reasonableness compared with the usual least square method. 展开更多
关键词 fatigue test s-n curve weighted least square method confidence interval
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基于MSC.Fatigue的电子设备随机振动疲劳分析 被引量:22
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作者 郭建平 任康 +1 位作者 杨龙 南雁 《航空计算技术》 2008年第4期48-50,共3页
针对机载电子设备随机振动问题,研究利用数字仿真技术预测结构随机振动疲劳寿命的方法。以某机载电子设备结构为研究对象,根据随机振动理论和有限单元法,采用MSC.Fatigue软件进行随机振动疲劳分析,计算疲劳寿命大小及分布。通过把计算... 针对机载电子设备随机振动问题,研究利用数字仿真技术预测结构随机振动疲劳寿命的方法。以某机载电子设备结构为研究对象,根据随机振动理论和有限单元法,采用MSC.Fatigue软件进行随机振动疲劳分析,计算疲劳寿命大小及分布。通过把计算结果与试验结果进行对比,证明利用随机振动疲劳分析方法预测此类产品的疲劳寿命是可行的。 展开更多
关键词 随机振动 疲劳寿命 功率谱密度 S—N曲线
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疲劳分析软件MSC Fatigue的工程应用 被引量:3
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作者 刘青峰 王发灯 郑红霞 《计算机辅助工程》 2013年第A01期492-496,共5页
为实现交叉杆的疲劳寿命预测,应用实测载荷和材料数据,进行有限元的应力分析,采用名义应力法,基于MSC Fatigue进行交叉杆的疲劳寿命预测,与交叉杆的实际使用寿命较为吻合.表明基于虚拟疲劳设计软件的疲劳设计方法合理可行,为交叉杆的结... 为实现交叉杆的疲劳寿命预测,应用实测载荷和材料数据,进行有限元的应力分析,采用名义应力法,基于MSC Fatigue进行交叉杆的疲劳寿命预测,与交叉杆的实际使用寿命较为吻合.表明基于虚拟疲劳设计软件的疲劳设计方法合理可行,为交叉杆的结构优化设计和疲劳寿命预测提供参考. 展开更多
关键词 交叉杆 疲劳寿命 名义应力法 载荷谱 S—N曲线
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RELIABILITY OF AEROCRAFT GEAR FATIGUE STRENGTH
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作者 谈嘉祯 边新孝 王小群 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 1995年第1期34+31-33,共4页
With the method of group test, fourty pairs of carburization-quenching gears made from 16NCD13 steel for aerocraft were tested to research the contacting fatigue strength on tooth flank. As a result, the samples of fa... With the method of group test, fourty pairs of carburization-quenching gears made from 16NCD13 steel for aerocraft were tested to research the contacting fatigue strength on tooth flank. As a result, the samples of fatigue life at the moments when the pitting appears and reaches failure criterion were obtained at four stressing levels respectively. The distribution rule of fatigue life were distinguished, and the distribution parameters were estimated by statistical analysis. Based on that, the R-S-N curves with confidence 95% of contacting fatigue on gear tooth flank were evaluated. Therefore, the basic data were provided for the reliability design of the gears and prediction of their life. 展开更多
关键词 aerocraft gear contacting fatigue strength of tooth flank R-s-n curve
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A GENERAL CONSTITUTIVE RELATION FOR FATIGUE CRACK GROWTH ANALYSIS OF METAL STRUCTURES 被引量:27
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作者 W.C. Cui and X.P. HuangSchool of Naval Architecture & Ocean Engineering, Shanghai Jiaotong University, Shanghai 200030, China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2003年第5期342-354,共13页
Crack growth rate curves are the fundamental material property for metal structures under fatigue loading. Although there are many crack growth rate curves available in the literature, few of them showed the capabilit... Crack growth rate curves are the fundamental material property for metal structures under fatigue loading. Although there are many crack growth rate curves available in the literature, few of them showed the capability to explain various special phenomena observed in tests. A modified constitutive relation recently proposed by McEvily and his co-workers showed very promising capability. This modified constitutive relation is further generalized by (1) introducing an unstable fracture condition; (2) defining a virtual strength to replace the yield stress; and (3) defining an overload and underload parameter. The performances of this general constitutive relation for fatigue crack growth is extensively studied and it is found that this general constitutive relation is able to explain various phenomena observed with particular strong capability on load sequence effect. 展开更多
关键词 metal fatigue s-n curve crack growth rate general constitutive relation mean stress effect load sequence effect
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Fatigue Analysis of the Taut-Wire Mooring System Applied for Deep Waters 被引量:8
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作者 黄维 刘海笑 +1 位作者 单桂敏 胡存 《China Ocean Engineering》 SCIE EI 2011年第3期413-426,共14页
Precisely predicting the fatigue life of taut-wire mooring systems has become an interesting and important problem for scientists and engineers since there are still difficulties in the inspection and maintenance of m... Precisely predicting the fatigue life of taut-wire mooring systems has become an interesting and important problem for scientists and engineers since there are still difficulties in the inspection and maintenance of mooring lines in a rough sea environment especially in deep waters. In this paper, a comprehensive fatigue analysis is performed for a polyester taut-wire mooring system of an FPSO based on the time domain dynamic theory, rainflow cycle counting method and linear damage accumulation rule of Palmgren-Miner. Three influential factors in the fatigue analysis including the pre-tension, dynamic stiffness and T-N curve are investigated in detail. Two polyester T-N curves, one is from the DNV- 0S-E301 and the other is from the API-RP-2SM, are adopted in the calculation. The fatigue analysis of the mooting system after one-line failure is also carried out. The calculation results indicate that the fatigue life is significantly affected by the T-N curve. The fatigue life decreases with increasing pre-tension, and is largely reduced if taking into account the dynamic stiffness caused by cyclic loading. The analysis also proves that one-line failure has remarkable effects on the fatigue lives of other mooting lines. The present parametric and comparative study is believed to be meaningful to further understanding of the taut-wire mooting system for deepwater applications. 展开更多
关键词 taut-wire mooring system fatigue analysis T-N curve dynamic stiffness PRE-TENSION one-line failure
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Temperature-dependence of acoustic fatigue life for thermal protection structures 被引量:3
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作者 Yadong Zhou Shaoqing Wu +1 位作者 Zhiyong Tan Qingguo Fei 《Theoretical & Applied Mechanics Letters》 CAS 2014年第2期27-31,共5页
Acoustic fatigue life evaluation is essential for thermal protection struc- tures due to the severe thermo-acoustic load in service. A study on temperature- dependence of acoustic fatigue life for a C/SiC panel is pre... Acoustic fatigue life evaluation is essential for thermal protection struc- tures due to the severe thermo-acoustic load in service. A study on temperature- dependence of acoustic fatigue life for a C/SiC panel is presented in this paper. Effects of temperature on both the structural responses and the S-N curves are investigated. The Dirlik method is adopted to predict the fatigue life of a C/SiC panel at three different temperatures respectively. Significant differences are ob- served from the results of numerical simulations between the fatigue lives of the panel in the three cases. The temperature-dependence of acoustic fatigue life of a C/SiC panel is verified, and fatigue test of the material needs to be more atten- tively performed. 展开更多
关键词 C/SiC panel s-n curve acoustic fatigue TEMPERATURE-DEPENDENCE
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