熔合线和焊趾处疲劳裂纹扩展速率较其他部位大。
The fatigue crack propagation rate of the fusion line and weld toe are greater than that of the others.
基于材料的循环塑性预测了疲劳裂纹扩展的门槛值。
Fatigue crack growth threshold is predicted based on materials cyclic plasticity.
提出了拉伸超载对疲劳裂纹扩展过程影响的一般机制。
A general mechanism of the effect of tensile overload on FCP behaviour is proposed.
计算过程极简单而迅速，因此特别适用于疲劳裂纹扩展分析。
This procedure is rather simple and fast, so it is specially suitable for use in the analysis of fatigue crack development.
因此，高温下疲劳裂纹扩展规律的研究具有很大的工程实用价值。
Therefore, the study on fatigue crack growth laws at high temperature is very useful for safety of high temperature equipments.
同时分析了材料刚度衰减对疲劳裂纹扩展速率和扩展长度的影响。
The impact of the material constant and the degradation of elastic modulus are analyzed.
本文对谱载荷下预测疲劳裂纹扩展的各种模型作了综合介绍及评述。
This paper gives a comprehensive introduction and review of the models for predicting fatigue crack growth under spectrum loadings.
温度、载荷频率和应力比是影响材料疲劳裂纹扩展行为的主要因素。
Three variables as temperature, load frequency and stress ratio are the critical parameters affecting fatigue crack growth behaviour in metallic material.
在确定性袭纹扩展模型的基础上，建立了疲劳裂纹扩展的随机模型。
A stochastic crack growth procedure which based on the determined crack growth model is presented in the paper.
结果表明，该近似表达式适用于A型腐蚀疲劳裂纹扩展速率的计算。
The given calculating example shows that the expression has a better applicability for the crack propagation rate of type A.
在应力比，残余应力对疲劳裂纹扩展的影响方面获得了有价值的成果。
We get valuable results about the effect of the stress ratio and residual stress on fatigue crack growth.
疲劳裂纹扩展率表达式是采用疲劳裂纹扩展理论预报疲劳寿命的核心。
The fatigue crack growth rate is the core for predicting fatigue life by use of fatigue crack propagation (FCP) theory.
本文回顾了各种金属及合金在门坎区附近的疲劳裂纹扩展的机制和特征。
This paper presents a review of the characteristics and mechanisms of fatigue crack propagation at near-threshold range in various metals and alloys.
本文回顾了各种金属及合金在门坎区附近的疲劳裂纹扩展的机制和特征。
This paper presents a review of the characteristics and mechanisms of fatigue crack propagation(FCP)at near-threshold range in various metals and alloys.
疲劳裂纹扩展阶段裂纹尖端附近为形成于铁素体晶粒内的位错胞及亚晶。
Dislocation cell and sub grain formed in ferrite grain are found at the stage of fatigue crack propagation in the area of crack tip.
采用CT试样研究了8090铝锂合金疲劳裂纹扩展行为与裂纹闭合效应。
The growth and closure characteristics of fatigue cracks were studied by using CT type specimens in 8090 Aluminium-Lithium alloy.
并利用三维动态有限元模拟了点焊接头疲劳裂纹扩展过程中频率变化特性。
Then the characteristics of frequency variation during the fatigue crack propagation process are simulated by three - dimensional dynamic finite element analysis.
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.
考虑平均风速的分布的影响，建立了随机荷载作用下的疲劳裂纹扩展模型。
Taking the distribution of mean wind velocity into account, the random crack growth model under variable amplitude load was established.
导致加载序列作用的加载历史极大地影响着变幅加载下的疲劳裂纹扩展行为。
Fatigue crack propagation behaviour under variable amplitude loading is significantly influenced by load history induced sequence effects.
本文给出二维疲劳裂纹扩展门槛值分布函数，建立二维应力—门槛值干涉模型。
A distribution function of two dimensional threshold is given for fatigue crack propagation.
本文给出二维疲劳裂纹扩展门槛值分布函数，建立二维应力—门槛值干涉模型。
A distribution function of two dimensional threshold is given for fatigue crack propagation. A two dimensional stress threshold interference model is set up.
研究裂纹端部三维应力约束、塑性约束和位移约束等对谱载疲劳裂纹扩展的影响。
The objective of this paper is to study the effects of three dimensional constraints on fatigue crack growth under aircraft spectrum loading.
发现高于二次硬比峰温度回火时，此钢的疲劳裂纹扩展阻力随回火温度升高而增加。
It is found that the steel resistances to fatigue crack growth increase with the rising of the tempering temperature when it is higher than the second hardening peak temperature.
在此基础上，建立了腐蚀环境下疲劳裂纹扩展速率试验中裂纹长度的自动检测技术。
On the basis of this, an automatic measurement technique of fatigue crack length in fatigue crack growth rate test under corrosive circumstance is established.
试验还表明电瓷材料静态疲劳裂纹扩展规律与材料的配方、环境和受力等因素有关。
On the basis of the above test, we suggest that the crack propagation law for all electric porcelains depends on sintering composition of test materials, environment and loading conditions.
基于可靠度理论，本文采用一次二阶矩法(JC法)对疲劳裂纹扩展可靠性进行计算。
Based on reliability theory, the first order second moment method (JC method) is adopted to analyze and compute the fatigue reliability.
疲劳寿命的计算采用断裂力学方法，建立疲劳裂纹扩展模型和失效模式的极限状态方程。
Fatigue damage estimation of the tendons was made using fracture mechanics approach, establishing the fracture crack growth rate model and limit state equations for failure modes.
应用二维单侧容限系数公式，提出了一种测定金属材料疲劳裂纹扩展速率的小样本方法。
A small sample method for testing fatigue crack growth rate curve of steel was presented in this paper using a formula of two-dimensional one-side tolerance factor.
应用二维单侧容限系数公式，提出了一种测定金属材料疲劳裂纹扩展速率的小样本方法。
A small sample method for testing fatigue crack growth rate curve of steel was presented in this paper using a formula of two-dimensional one-side tolerance factor.
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