疲劳极限

室温时WC-6Co冲击疲劳极限在0.3～0.4Ak之间。

In room temperature , impact fatigue limit is between 0.3 and 0.4 Ak .

铁路常用材料Goodman疲劳极限线图的绘制与应用

Plotting and Application of Goodman Fatigue Limit Diagram of Railway Common Materials

估计构件疲劳极限的Bayes极小样本方法

Minimum sample method to determine the fatigue limits of structural components based on Bayes estimation

该疲劳极限线图可以预测应力比r＜-1情况下材料的疲劳极限，对传统理论具有参考和补充作用。

This graph can predicts materials ' fatigue limit under the circumstance that stress ratio is less - 1 and is also a complement to traditional theory .

研究表明，C2的高疲劳极限主要是由于其渗碳后表面硬度高、渗层深，此外由于C2钢渗碳热处理变形小，疲劳试样加工后渗碳层厚度均匀。

The higher fatigue limit C2 is largely due to its higher surface hardness and a deeper carburized case depth .

WA和GA粉末试样的疲劳极限分别约为300MPa和310MPa。

The fatigue limits of the WA and GA powder compacts were approximately 300 MPa and 310 MPa , respectively .

表面压缩残余应力对表面破坏模式疲劳极限的影响可以用修正Goodman图表示。

The fatigue limits of surface fracture mode affected by the surface compressive residual stress can be expressed by modified Goodman diagram .

从材料的SN曲线与构件的SN曲线形状相似原理出发，结合Bayes估计理论和加速寿命试验理论，提出一个估计构件疲劳极限的极小样本方法。

A minimum sample method is given to determine the fatigue limits of structural components based on Bayes estimation theory , the accelerated life testing theory and the similarity of S & N curve between material and components .

对16Mn合金钢试作进行了旋转弯曲疲劳极限的快速测定。

Described a rapid test method for rotation bending fatigue strength of alloy steel .

用Haigh图估算缺口试样疲劳极限

Estimation of notch fatigue limit with Haigh diagram

介绍修正Goodman疲劳极限线图的绘制和使用方法；

SOLUTION OF THE ROOT OF LINE GRAPHS The plotting and application methods of the modified Goodman fatigue limit diagram are introduced in the paper .

采用S-N曲线研究硫酸阳极化、铬酸阳极化和硼酸硫酸阳极化对航空铝合金疲劳极限的影响。

The effect of sulfuric acid , chromate acid and boric / sulfuric acid anodizing on fatigue performance of aeronautic aluminum alloys was studied by using S-N curve .

可是最近十几年的研究却发现高强度钢在承受低于疲劳极限的交变载荷作用，当加载超过107周次的超长寿命区域（Giga-fatigueregime），发生由材料内部夹杂物等缺陷引起的疲劳破坏。

However , in recent teen years it is found that the high strength steel can also fracture from the defect as internal inclusion in the very high cycle regime above 107 loading cycles at the stress amplitude below the convention fatigue limit .

对实验数据进行回归与概率统计分析，获取理论疲劳极限与P-S-N关系表达式，推导电阻变化率表征的损伤演化方程。

The experiment data are processed using the regression analysis and the probabilistic method , the theoretical fatigue threshold and P-S-N representation are achieved , and the fatigue damage evolution equation is deduced .

过滤提高了变形态合金的疲劳极限，改变了S-N曲线的形状，减缓了裂纹萌生和初期裂纹的扩展速率。

As a result of filtration , the fatigue limit of as forged condition alloy is enhanced , the feature of curve S-N is changed , crack occurrence and velocities of crack develop are slowed down in the initial stage .

同时，铝合金具有选材和加工方便，疲劳极限小，疲劳过程便于实验室控制等优点，在基于EMI技术的疲劳损伤监测研究中获得了普遍应用。

On the other hand , aluminum alloy has many advantages such as the convenient material selection and forming , the small fatigue limit , and the easily controlled fatigue process . This material has been widely used in the monitoring of fatigue damage with the EMI technique .

压铸镁合金AZ91HP在大气环境中存在疲劳极限，约为90MPa，而在模拟海水环境中不存在疲劳极限；

There exists the fatigue limit in atmosphere environment , which is around 90 MPa , and there is no fatigue limit in simulated seawater environment ;

说明我国铁路常用材料Goodman疲劳极限线图是通过先确定材料具有存活率、置信度双95%的对称循环疲劳极限后，借助修正Goodman疲劳极限线图的绘制方法，通过简单几何作图而得；

The Chinese railway material Goodman fatigue limit diagram is prepared through simple geometric drawing by means of the modified Goodman fatigue limit diagram after material symmetry circulation fatigue limit being confirmed to be 95 % survival rate and 95 % credit degree .

材料的疲劳极限为160MPa，约为静拉伸强度值的91.7%，在疲劳周次超过10~4以后试样几乎不再破坏，材料具有很好的抗拉疲劳性能。

The fatigue limit was found to be 160 Mpa ( 91.7 % of the tensile strength ), and no fracture was found at over 10 ~ 4 cycles .

本文采用最大主应力法将多轴应力转化为单轴应力状态，参照Haigh形式的Goodman疲劳极限图，得出机械载荷下高速客车车轮辐板的疲劳强度满足评估要求。

This paper use maximum principal stress method to translate multiaxial stress state to uniaxial stress state . According to the Haigh-Goodman fatigue limit diagram , it is showed that the fatigue strength of high speed passenger car wheel web satisfy the design requirements under the mechanical loads .

针对Gerber抛物线在可靠性强度计算中疲劳极限的均值和标准差的计算，与实验数据比较符合，并对比折线方程的优点加以分析说明，为可靠性设计研究奠定了理论基础。

The calculating values of the standard difference of fatigue limit in reliability intensity of Gerber 's parabola were in good agreed with the testing data . The advantages of the fold curve equations were analyzed in detail , it provided the theoretical supports for the reliability design .

SKF工程研究中心提出的滚动轴承寿命新理论和新计算方法，考虑了当轴承载荷低于疲劳极限载荷时的无限寿命现象和杂质颗粒的影响，具体应用时应根据实际工况，确定是否适用新方法。

The new theory mentioned in this article considers the phenomenon of " infinite life " and the influence of the impurity particles , so it is necessary to determine whether or not the new life calculating method being used according to the actual working conditions of the bearing .

快速测定构件疲劳极限可靠性的探讨

A Probe into Reliability for Quickly Determining Fatigue Limit of Components

喷丸件表面粗糙度及其对疲劳极限的影响

Surface Roughness of Shot-Peened Specimens and Its Influence on Fatigue Limits

关于机械可靠性设计中疲劳极限图的探讨

A Discussion on the Fatigue Limit Diagram for Machine Reliability Design

抽油杆柱条件疲劳极限可靠性设计法

Reliability Design Method of Conditioned Fatigue Limit of Sucker Rod String

双圆弧齿轮的接触疲劳极限与安全系数

The Surface Fatigue Strength and Safety Factor of W N Gear

起重机零件疲劳极限应力分布的快速测定

Rapid determination of distribution of fatigue stress limits in crane parts

合金钢材疲劳极限估算的不确定性系统模型

Uncertainty System Model of Fatigue Limit Prediction of General Automotive Alloy Steels

极限概念的辩证法探讨对疲劳极限线图的理论分析

On Limit The theoretical approach of contour of fatigue limit