裂纹扩展

实验结果和模拟结果都表明，该试样厚度下，应力比对裂纹扩展速率几乎没有影响。

Both the numerical analysis and experimental data show that the fatigue crack propagation rate is insensitive to the stress ratio for plain stress thin specimens .

K型管状接头随机疲劳强度和裂纹扩展规律的研究

An Investigation on Random Fatigue Strength of K-Type Tubular Joints and Crack Propagation Behaviors

用C形试样研究HK&40炉管蠕变裂纹扩展

Study of Creep Cracks Growth of HK-40 Furnace Tubes with C-shaped Specimens

应力腐蚀指数n的大小强烈依赖于加载方式，并能作为材料抵抗裂纹扩展的某种抗力指标，循环载荷和动载荷对材料造成了附加损伤，致使在相同应力水平下材料寿命明显下降。

Cyclic and dynamic loading causes additional damage to materials and shortens lifetime .

SiC／Al复合材料的微观结构对裂纹扩展的影响

Effects of Microstructure to Cracking and Propagating in SiC / Al Composite Material

Jn-积分和裂纹扩展的控制参数

J_n - intergral and the controlling parameter for crack growth

Na，K杂质及微量Ce对8090合金裂纹扩展阻力的影响

Effect of Na and K impurities and CE modification on crack propagation resistance for alloy 8090

300M钢锻件中的裂纹扩展机理

The Spread Mechanism of Cracks in the Forging Made of 300M Steel

在不同疲劳裂纹扩展阶段，电解加钛和熔配加钛对扩展速率da／dN的影响有所不同。

The effects of the two titanium alloying methods on fatigue crack growth rate are different in different test procedure .

简要讨论了裂纹扩展率da／dN的实验数据分散的主要来源。

In this paper , the main sources of scatter of fatigue crack propagation rate da / dN are briefly dis-cussed .

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 .

20g钢高温裂纹扩展控制参量

Fracture Mechanics Parameter of Controlling Crack Propagation for 20g Steel at High Temperature

用SEM、TEM观察了复合材料表面抛光组织、断口形貌、裂纹扩展和微观结构。研究了ZrO2含量对复合材料的力学性能的影响。

Surface polished structure , fracture morphology , crack propagation and substructure of the composites were observed with SEM and TEM .

Ti3Al基金属间化合物的疲劳裂纹扩展与断裂

Fatigue Crack Growth and Fracture of Intermetallic Compound Based Ti_3Al

根据Paris疲劳裂纹扩展规律，对拉伸和纯弯曲疲劳载荷下表面裂纹扩展进行了数值模拟。

Fatigue crack growth of surface cracks in tension and bending plates is investigated with numerical simulation technique based on the Paris law of fatigue crack growth 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 .

用虚拟裂纹扩展方法计算的动态J积分与路径无关，惯性效应对动态J积分基本没有影响。

Dynamic J - integral is path independent by use of VCE method , and inertia has little influence on the values of dynamic J - integral .

聚对苯二甲酸丁二醇酯（PBT）是一种重要的热塑性工程塑料，主要缺点是裂纹扩展能较低和裂纹引发能很高，缺口冲击强度特别低。

PBT is an important engineering thermoplastic with low crack propagation energy , high crack initiation energy and low notched impact strength .

TiB2颗粒增强锌基合金中短、长疲劳裂纹扩展行为

The Propagation Behavior of Short and Long Fatigue Crack in TiB_2 Particulate Reinforced Zn ( ZA-8 ) Alloy

用准静态移动奇异元法模拟DCB模型的动态裂纹扩展

The simulation of dynamic crack propagation in DCB model by quasi-static moving singular element method

为保证剩余强度要求，本文通过在裂纹扩展计算中以应力强度因子达到K（1c）／1.2作为终止条件来实现。

To meet the residual strength requirement , it takes the stress intensity factor K1C / 1 . 2 as the termination condition in crack propagation calculation in the article .

结果表明：加入短纤维的FRP加固混凝土结构的裂纹扩展缓慢，韧性得到改善，承载能力明显提高。

It is revealed that the crack propagation is slow , and the mechanic properties of FRP strengthened RC beam with short fibers are thus improved in ductibility especially in carrying ability .

对已超期服役且中度球化的焦炭塔20g材质在常温下的疲劳裂纹扩展速率da/dN进行了试验研究。

Fatigue crack propagation rate on normal temperature for 20 g steel that has served a coke tower over its design life was studied .

疲劳断口SEM形貌分析表明，Nd含量为1.13%的合金具有最大的疲劳裂纹扩展区域，3种Nd含量的合金疲劳断口都存在撕裂棱和韧窝，表现为准解理和韧性断裂的混合特征。

SEM analysis shows that the alloy containing 1 % Nd exhibits the maximum fatigue propagation regions . There exists rip edge and dimple in rupture of three different Nd content alloys , showing quasi-cleavage and toughness fracture .

可加工Ce-ZrO2/CePO4陶瓷材料的裂纹扩展及加工损伤

Crack Propagating and Machining Damage of Machinable Ce-ZrO_2 / CePO_4 Ceramic

最后给出了系统用于LC9铝合金腐蚀疲劳裂纹扩展门坎试验的结果。

Finally , the results of corrosion fatigue threshold testing of LC_9 aluminium using this system have boen given .

在激光重熔中，SiO2能降低ZrO2熔化层应力并阻碍裂纹扩展；

During laser remelting , the additive SiO 2 can not only reduce the cooling stress of the remelted layer in ZrO 2 coating , but also hinder the spreading of cracks .

使用带拉伸实验台的扫描电镜观察到了TLCP微纤或微球对微裂纹扩展的阻滞及延缓作用。

The fracture process observed by SEM with a dynamic tensile stage showed that the dispersed phase of TLCP could delay and block the propagation of microcracks .

研究了不同腐蚀介质中及加载频率下X60管线钢的腐蚀疲劳裂纹扩展特性。

The characteristics of corrosion fatigue crack propagation of X60 pipe steel at different loading frequencies and in different corrosion media were studied .

用零记忆非线性变换法模拟了满足Weibull分布和一定相关性的平均风速时间样本，计算了结构主裂纹扩展的时间样本，根据Monte-Carlo方法得出了给定时间的裂纹尺寸分布。

The time series of mean wind velocity with given Weibull distribution and time related funtion were simulated by zero-memory nonlinearity method . The sample of crack growth was calculated . The statistical quantities were gained by Monte-Carlo method .