At last, adopting PFM to estimate fatigue crack growth life for welded steel beams under given reliability.
最后，给出了概率断裂力学方法预测焊接钢梁在给定可靠度下疲劳裂纹扩展寿命的算例。
The reliability of the fatigue crack growth life of single inclusion is analyzed by the advanced first order and second moment method.
采用改进一次二阶矩法分析单个夹杂裂纹扩展的可靠性。
To predict the fatigue crack growth life of welded equipments at elevated temperature, a group of novel fatigue crack growth equations was proposed.
为了预测焊接构件在中温环境下的疲劳裂纹扩展寿命，提出了一组新的疲劳裂纹扩展方程。
In response to the complexity of calculation for failure probability regarding fatigue crack growth life, a method for reliability analysis based on neural network response surface was presented.
针对疲劳裂纹扩展寿命失效概率计算的复杂性，提出基于神经网络响应面的可靠性分析方法。
Based on residual strength interference model and life interference model, a sensitivity analysis method on reliability was proposed for the fatigue crack growth life of powder metallurgy materials.
结合粉末冶金材料含有非金属夹杂裂纹的特点，以裂纹扩展寿命可靠性分析的剩余强度模型与寿命干涉模型为基础，建立了多夹杂裂纹扩展的可靠性敏度分析模型。
It is shown that a regular pattern distribution of scattered alloying zones which surrounded by phase transformation zone can retard the fatigue crack growth rate and improve the fatigue life.
研究表明，大量规则分布、互不重叠的合金化区及其周围的相变硬化区从总体上降低了疲劳裂纹扩展速率，提高了材料的疲劳寿命。
Fracture mechanics is adopted to estimate the fatigue life of structural members, and among the rest, crack growth rate formula is studied.
本文采用断裂力学方法来估算结构构件的疲劳寿命，这其中主要围绕裂纹扩展速率表达式展开研究。
The fatigue crack growth rate is the core for predicting fatigue life by use of fatigue crack propagation (FCP) theory.
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。
A calculating method of the total fatigue life of structural joints is proposed based on a study on both the fatigue crack initiation life and crack growth life of joints.
通过对结构疲劳裂纹形成寿命和裂纹扩展寿命的研究，提出了连接件疲劳全寿命的计算方法。
Study of fatigue crack growth rate and fatigue life calculation under random loading is very important for the reliable life prediction of engineering structures.
变化载荷作用下裂纹扩展律和疲劳寿命的计算对工程结构的寿命的可靠预测是十分重要的。
The results show that the crack growth rate under high-low cycle complex fatigue load is greater than that under low cycle fatigue load, and so the fatigue life is obviously reduced.
结果表明：与纯低周载荷作用相比，高低周复合载荷下球墨铸铁的裂纹扩展速率明显加快，极大地降低材料的疲劳寿命。
Studying of fatigue crack growth under different spectrum loadings is very important for the reliable life prediction of ship structures.
研究裂纹在谱载荷作用下的扩展规律对可靠预报平台等结构物的疲劳寿命具有十分重要的意义。
As compared with the experimental life it shows that the predicting ability based on the growth characteristics of short fatigue crack was improved obviously.
预测和实测寿命对比表明，基于短裂纹扩展特性的预测能力有显著改善。
Therefore, it is necessary to evaluate the influence of overloads on crack growth rates for the fatigue life prediction of structures subject to variable amplitude loadings.
要准确预测结构在变幅载荷谱下的疲劳裂纹扩展寿命，必须研究超载对裂纹扩展的影响。
The fatigue life for bracket was predicted by way of the unique crack growth rate model incorporating the above SIF functions and the predicted results were in good agreement with the experiment data.
结合裂纹扩展率单一曲线模型对肘板裂纹扩展寿命进行了预报，预报结果与实验结果符合得较好，说明所采用的方法可行。
The fatigue life for bracket was predicted by way of the unique crack growth rate model incorporating the above SIF functions and the predicted results were in good agreement with the experiment data.
结合裂纹扩展率单一曲线模型对肘板裂纹扩展寿命进行了预报，预报结果与实验结果符合得较好，说明所采用的方法可行。
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