疲劳强度

"Carbon steel has high and low temperature strength , is very tough and has excellent fatigue strength ."

碳钢具有高温和低温强度，具有很高的韧度和优异的抗疲劳强度。

The force that stressing the inner bit is stressed is complex and analysis of intensity of the inner bit is made by ANSYS project analysis software base on the finite element theory,and the method of improving the punishing stress on the face of the inner bit pedestal is proposed.

针对受力复杂的内钻头，利用有限元理论，采用ANSYS工程软件对其进行强度。析，并提出了改善其疲劳强度。足的方法。

The current research points out that for the CFCHS joints the linear extrapolation method can be used for chords,whereas the quadratic extrapolation method must be used for braces.The hot spot stress distributions on the CFCHS joints tend to be more uniform and their SCFs become smaller significantly,compared with the CHS joints.Axial tension on the brace puts the CFCHS joints at a disadvantage,which produces higher SCFs than axial compression.The effects of nondimensional geometric parameters β,τ and γ on SCFs of the chords of the CFCHS joints are basically the same as those of the CHS joints,but for the braces,there is a bit difference in the effects of parameters β,τ and γ between the two kinds of joints.Concrete has the function of improving the CFCHS joint rigidity and then decreasing SCFs which is expected to increase fatigue strength,but concrete strength grade does not exert significant influence on SCFs.

研究表明：CFCHS节点的热点应力，对主管可采用线性外推方法，对支管需采用二次外推方法；相比CHS节点，CFCHS节点的热点应力分布趋于均匀，SCF显著减小；CFCHS节点支管轴向受拉比受压不利，SCF增大；CFCHS节点几何参数β，τ，γ对主管SCF的影响效应与CHS节点基本一致，但是对支管SCF的影响效应与CHS节点有些差异；混凝土的作用主要是改善CFCHS节点刚度，从而降低SCF，并预期可提高疲劳强度，但混凝土自身强度等级的高低没有显著影响节点的SCF。

The factors influencing on press fit load in assembly were analyzed by the FEM numerical simulation,and the press fit load ,static torque and fatigue torsional strength were experimentally verified.

本文阐述了装配式凸轮轴的技术优势，介绍了装配式凸轮轴的滚花连接机理，采用数值模拟的方法对影响滚花连接压装力的各种因素进行了分析，并完成滚花连接压装实验、静扭强度和疲劳强度试验。

The snap ring of wheelset influences the wheelset's behavior in many aspects, such as the static intensity, the fatigue strength, the dynamics performance and the minimum allowable stress.

铁路运输中带扣环轮对由于其结构的改变可能在静强度、疲劳强度、动力学性能、最小许用边界等诸多方面发生变化从而威胁到列车的安全运行。

Strength properties are commonly referred to as tensile strength, compressive strength, bending strength, torsional strength, shear strength and fatigue strength.

力量特性通常被称为抗拉的力量，压缩的力量，弯曲力量，扭转的力量，剪切强度和疲劳强度。

Products manufactured by the Chinese National Automotive Test Center tests: fatigue strength, static torsional strength are in line with National standards.

公司生产的产品经过中国国家汽车检测中心检测：疲劳强度，静扭强度均符合国家标准要求。

The locking mechanism significantly increases the prompt fixation strength and antifatigue strength of the tested screw-plate systems.

锁定机制提高了颈椎前路钢板螺钉的即刻固定强度和抗疲劳强度。

Comparison and analysis of depth distributions of yield strength, half-width of X-ray diffraction profile, and microhardness in the decarburized layer of spring steel 60Si2Mn was made, and the advantage of the new method was discussed.

对弹簧钢60Si2Mn的脱碳层的屈服强度、X射线衍射线半高宽和显微硬度的层深分布作了对比和分析，在此基础上指出利用新方法进行软化表征有助于更深入阐明脱碳影响疲劳强度的机制，并有望建立某些定量关系。

Spring fatigue strength is a key performance index. Fatigue strength is less than static stress strength such as elasticity limit,yield strength.

弹簧由于承受交变应力的作用，在运行过程中发生的弹簧断裂主要是疲劳断裂，所以，弹簧的疲劳强度是关键的性能指标。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。