扩展速率

低周疲劳裂纹扩展速率的试验系统

Test System of Low - Cycle Fatigue Crack Growth Rate

硫化氢环境中低周疲劳裂纹扩展速率的研究

Low cycle fatigue crack growth rate in h_2s environments

加载频率f和应力比R对腐蚀疲劳裂纹扩展速率影响的研究

Effect of Stress Ratio and Loading Frequency on Crack Growth Rate of Corrosion Fatigue

采用Paris公式描述缺口表面裂纹扩展速率的条件

The Conditions of Application of the Paris Relationship to Representing Notch Surface Crack Propagation Pate

描述低周疲劳裂纹扩展速率的循环J积分新参量

New Cyclic J-Integral for Low-Cycle Fatigue Crack Growth

使用应力强度因子范围ΔK对小裂纹和长裂纹的扩展速率进行关联。

Small and long fatigue crack growth rates , da / dN , are presented against the stress intensity range , Δ K.

疲劳裂纹扩展速率（da）/（dN）的超声瑞利波测量

Measurement of Fatigue Crack Propagation Rate da / dN by Using Ultrasonic Rayleigh Waves

用金相显微镜、扫描电镜（SEM）及带有切口的三点弯曲试样研究了显微组织对珠光体钢疲劳裂纹扩展速率的影响。

The effect of microstructure on propagation rate of fatigue crack was investigated by SEM and three point bending specimens with notch .

考查了名义K梯度C对于低速或近门槛速率测试的影响，提出了适用于低、中速疲劳裂纹扩展速率的一种简单表达式。

The effect of the normalized K-gradient C on low or near-threshold FCG rate is examined and a simplified expression is proposed for low and intermediate FCG rate .

Z型疲劳裂纹在单峰过载下的扩展速率及迟滞效应研究

The investigation on a growth rate and retardation effect of Z-shaped fatigue crack under constant amplitude loading with a single overload

实验还发现Paris公式中的m和C值相互互补，变化很小，两者共同体现了实验钢裂纹扩展速率的第二阶段具有对不同的微观组织特征并不敏感的现象。

Parameters of m and C in the formula of Paris are mutually complementary and have small changes with tempering temperature , indicating that are insensitive to microstructure .

高应力比下HQ－60钢焊缝的疲劳裂纹扩展速率

Fatigue Crack Growth Rate in Weld Metal of Steel HQ-60 Under High Stress Ratio

试验分析说明采用以平面应变性质为基础的Paris裂纹扩展速率定律应用于实际焊接结构具有一定安全性。

The test results and analyses showed that the Paris formulas based on plane strain behavior can be applied to practical welded structures with considerable confidence .

本文对车轴钢材料的疲劳裂纹扩展速率da/dN和应力强度因子门槛值△K（th）的特性进行了试验和计算。

The behaviour of fatigue crack growth rate da / dN and threshold of stress strength factor △ K_ ( th ) in axle steel is investigated and calculated .

显微组织及频率对Ti3Al基合金疲劳裂纹扩展速率的影响

Influence of Microstructure and Frequency on Fatigue Crack Growth Rate of Ti_3Al-based Alloy

疲劳保载时间与固溶处理对PMRené95合金高温裂纹扩展速率的影响

Effects of fatigue dwell time and solid solu - tion on crack growth rate of PM ren é 95 superalloy at high temperature

对于有预制裂纹的试样，低脆性岩石声发射与裂纹尖端塑性区大小有关，指数b取决于材料的强度特性；高脆性岩石声发射主要受裂纹扩展速率控制。

As to pre-cracked specimens , the low-brittleness rocks relate to the dimension of crack-tip plastic zone and index b depends on mechanical properties , whereas the high-brittle-ness rock are mainly controlled by the crack propagation rate .

研究表明，最大应力强度因子与裂纹扩展速率之间呈V型扩展行为，并对外加应力水平非常敏感。

A V shaped behavior was observed in the relation between the maximum applied stress intensity factor and the crack growth rate which is sensitive to the level of applied stress .

用当量J积分范围表征疲劳裂纹扩展速率不受试件结构形状和尺寸的影响，并且得到了裂纹扩展的门槛值和裂纹扩展寿命评价方程。

Shapes and sizes and that the relations between fatigue crack growing rates and equivalent J integral ranges were not affected by specimens . shapes and sizes .

裂纹扩展速率在区域I随裂尖应变速率增加而增大，而在区域II不随裂尖应变速率的改变而变化。

In region I , the crack growth rate increased with increasing crack tip strain rate . In region II , the crack propagation rate was independence of the crack tip strain rate .

木文研究了间接直流电位法（IDC法）和交流电位法（AC法）用于监测疲劳短裂纹扩展速率的有关技术问题。

The technique of measurement of growth , rate of fatigue short crack with indirect KC ( IDC ) potential system and AC potential system was investigated .

本文研究了SCT试样高应变区的疲劳裂纹闭合效应和疲劳裂纹扩展速率。

The fatigue crack closure and fatigue crack growth rate in the high strain region of SCT specimen are studied .

采用疲劳裂纹扩展速率试验方法中的紧凑拉伸试验（CT试验），得到了中锰铸钢疲劳裂纹扩展速率的数学表达式；

Compact Tension Method ( CT test ) was used to investigate the crack growth behavior of a medium manganese cast steel and accordingly a regression expression for crack growth rate is obtained based on the test data .

结果表明，残余奥氏体量越多，冲击疲劳裂纹起始寿命Ni越低，裂纹扩展速率da/dN越快。

The results show that with the increase of the retained Austenite amount , the impact fatigue crack initiation life N I decreases , the crack propagation rate da / dN speeds up .

结果表明：腐蚀疲劳裂纹扩展速率（da/dN）（CF）与（△K-△K（thCF））在双对数坐标上呈线性关系。

It results in that the crack propagation rate , ( da / dN ) CF , has a linear relationship with (Δ K - Δ KthCF ) on double-Log plots .

用CTOD描述高应变区疲劳裂纹扩展速率

The Dependence of Fatigue Crack Propagation Rate in High strain Region on Crack Tip Opening Displacement

研究了4130X钢在硫化氢（H2S）腐蚀介质中的疲劳裂纹扩展速率da／dN。

The fatigue crack growth rate ( FCGR ) of 4130X steel in H2S environment is researched in this paper .

目前研究中所使用的包括应力场强度因子K，、净截面应力σnet、修正J积分C在内的断裂力学参数，并不能有效关联Al/Al-4%Cu梯度材料的蠕变裂纹扩展速率。

Parameters used in present research including the stress intensity factor KI section stress σ net and modified J integral C cannot be directly associating creep crack growth rate of Al / Al-4 % Cu graded material .

P50钢轨钢的奥氏体晶粒度对其门槛值和裂纹扩展速率的影响

Influence of Austenitic Grain Size of P50 Railway Steel on Threshold Value and Crack Growth Rate

结果表明：30%△P以下的小幅载荷叠加在主载荷底部时，对由主载荷引起的裂纹扩展速率da／dN几乎没有影响，30%△P以上的小幅载荷可使裂纹扩展速率增加。

The results showed that the small loads with amplitude below 30 % △ P had little influence on da / dN caused by the principal load when they superposed on the bottom of △ P ;