屈服极限

确定材料屈服极限的一种新方法

Laboratorial Method of Determining Limit of Yielding of Material

根据厚壁圆筒的弹性失效准则所确定的圆筒的弹性极限压力与材料的屈服极限的关系，设计了一套测定厚壁圆筒弹性极限压力的液压系统，并测得了一组实验数据。

Based on the relation between the elastic limiting pressure and the limit of yielding in cylinder according to the elastic failure rule , a set of hydraulic system for determining the elastic limiting pressure was designed and a set of experimental data was gained by the hydraulic system .

该系统配合材料试验机，在专用软件控制下，可以快速实时地测定材料的弹性模量E、比例极限σp、屈服极限σ（0.2）。

Under the control of special software , this system can be used with a testing machine to measure elastic modulus E , proportional limit σ _p , a yield limit σ _ ( 0.2 ) of matrals in a fast and timely way .

结果表明：裂纹尖端塑性区尺寸和COD均随两种材料的最小屈服极限的增加而减小；COD随时间的增大而以先快后慢的速率增长。

The results reveal that the plastic-region size of the crack tip and COD decline as the smaller yielding ultimate of the two bound materials get greater , while COD raises at a speed dropping down as the time passes .

计算结果表明，最大热应力都发生在套管内壁，且超过了N80套管的热弹性屈服极限；

The calculated results indicate that the maximum thermal stress occurs in the internal wall of the casing pipe and is over the thermo-elastic yield ultimate stress of casing pipe made of N80 steel .

本文介绍WJ10A型材料试验机与TP801B单板微型计算机组成对弹性模数E及屈服极限б（0.2）等测试系统，该系统具有电子拉伸以及自动数据采集、处理、显示与打印的功能。

A microcomputer testing system composed of a WG-10A tensile testing machine and a TP & 801B microcomputer is designed to measure the elasticity module and the yield limit , etc. The System has functions of electronic tensile , and automatic data collecting , processing , displaying and printing .

屈服极限试验以10N/s的速度从500N~2000N范围内缓慢加载，填充物没有塑性变形；在1200N时，1个假体出现屈服。

When the prosthesis is slowly loaded vertically from 500N to 2000N at 10N / s rates , there is no plastic deformation of filler ; but in 1200N , one prosthesis appears yielding . 5 .

管线屈服极限试压的探讨

Discussion of field yield limit pressure testing for natural gas pipelines

发现最大拉应力超过材料的屈服极限。

It was found that the maximum tensile stress exceed the yield strength .

可靠性设计中材料屈服极限的最佳选择

Optimization of materials yield limit for reliability design

该格式同时也考虑了温度对屈服极限的影响。

The effect of temperature on the yield stress is included in the numerical method .

端梁内部的应力超过了屈服极限，小于强度极限，在应力较大的位置焊接补强板；

Inner stress of end beam was less than ultimate strength though it over yield limit .

在此研究过程中，提出了一种通过有限元仿真确认材料屈服极限的方法。

A new method of the determination of material yield strength is presented in the study .

连续油管屈服极限分析

Yield Limits of Coiled Tubings

结果表明：活塞环的机械应力、热应力、耦合应力均在材料屈服极限内。

The mechanical stress , thermal stress and coupled stress are less than the yield limit of material .

文章对宏观单向拉伸初始屈服极限的有限元计算值和实验值进行的比较表明了这种理论分析的可靠性。

The comparison between the numerical calculation and experimental results shows that the theoretical analysis is reliable enough .

在焊缝中心处，残余拉应力的峰值低于材料的屈服极限。

And in the weld center , the maximum value of residual stresses is lower than its yield strength .

对制品进行压缩实验，分析了屈服极限与放电能量的关系。

After the anti-press intensity experiments , the author analyzed the relation between anti-press intensity and the discharging energy .

同时钛的屈服极限与抗拉极限接近，增加了冷变形过程的难度。

The yield limit and tensile limit of titanium are adjacent , which increase the difficulty of cold deformation .

由于钛的屈服极限与弹性模量的比值大，使钛成型时的回弹能力大。

Its resilience is strong during shaping , because titanium 's ratio of yield limit to elasticity modulus is high .

采用高屈服极限或者较厚的钢套时钎焊变形较小；

Smaller deformation could be got when the steel body used had a bigger thickness or a higher yield strength .

本构方程表明应力与应变在屈服极限之前是线弹性阶段；在屈服极限之后表现出复杂的非线性特性。

It indicates that stress-strain relation is linearity before the off-set limit and has complicated non-linearity performance after off-set limit .

并结合路基变形特点，对软土层的屈服极限、沉降计算深度等问题进行了探讨。

Considering the feature of subgrade deformation , the off set limit and the settlement calculation depth are discussed in this paper .

从图表中的直线开始上升一直到屈服极限点是弹性变形区域。

The straight-line portion of the diagram up to almost the yield point is known as the elastic region of the diagram .

钻孔法测量残余应力的范围是应力不超过材料屈服极限的一半。

The scope of the residual stresses determined by the hole drilling method should not exceed one half of the material 's yield strength .

有限元分析结果显示，应力远小于材料的屈服极限，强度空间足够大；

The analysis result showed that stress was much smaller than the yield strength of the material , the strength space was large enough .

泡沫铝芯体夹层板与泡沫铝相比，具有更高的屈服极限和更好的缓冲吸能特性。

Compared with aluminum foam , sandwich beams with aluminum core is characterized in higher limited yield stress and better cushion energy absorbing property .

在二维或三维的情况下，屈服极限是当所有应力分量的某个函数达到某一固定值时达到的。

In two and three dimensions the yield limit is reached when a certain function of all the stress components reaches a fixed value .

在凝固过程中产生的铸造应力残余在铸件内，当残余应力值大于铸件的屈服极限时，就会产生裂纹。

The casting stress is generated during the process . When the residual stress exceeds the yield stress , the bull crack is easily generated .

这个临界值的实质是使孔边实际最大应力恰好达到材料屈服极限。

The nature of this critical value is that the maximum real stress at the hole edge is just equal to the yield limit of30CrMnSiA steel .