Influence of Residual Stress Redistribution on Fatigue Crack Growth and Damage Tolerant Design
Influence of Residual Stress Redistribution on Fatigue Crack Growth and Damage Tolerant Design
复制标题
残余应力重新分布对疲劳裂纹扩展和损伤容限设计的影响
DOI：
10.4028/www.scientific.net/msf.524-525.363
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
L. Edwards
中科院分区：
文献类型：
--
作者：
L. Edwards
通过损伤容限设计和评估，许多结构和部件的安全运行得到了保证。大量的残余应力可以存在于许多系统中，这是很重要的，这些被纳入疲劳裂纹扩展的损伤容限计算。最近的改进，在无损测量技术和应用的重量或绿色的功能方法，包括残余应力场的应力强度因子（SIF）的计算，使预测的残余应力对疲劳裂纹扩展的影响要更容易。来自航空航天工业的两个例子，包含（i）冷膨胀孔和（ii）熔焊的结构被用来表明，目前，虽然最终的裂纹扩展寿命可以准确地预测，裂纹扩展的细节没有很好地表示与初始增长通常被低估，后来的增长被高估。结果表明，这是最有可能是由于残余应力重分布。并且如果要为包含大量残余应力的部件和系统开发基于精确损伤容限的程序，则必须将其构建到疲劳寿命预测模型中。
The safe operation of many structures and components is ensured through the operation of damage tolerant design and evaluation. Substantial residual stresses can exist in many systems and it is important that these are incorporated in damage tolerance calculations of fatigue crack growth. Recent improvements in non-destructive measurement techniques and in the application of weight or Green’s functions methods of including residual stress fields into stress intensity factor (SIF) calculations have enabled predictions of the effects of residual stresses on fatigue crack propagation to be made more readily. Two examples from the aerospace industry, structures containing (i) cold expanded holes and (ii) fusion welds are used to show that presently, although final crack growth lives can be accurately predicted, the details of crack growth are not well represented with initial growth typically being underestimated and later growth being over estimated. It is shown that this is most likely to be due to residual stress redistribution. and that this must be built into fatigue life prediction models if accurate damage tolerance based procedures are to be developed for components and systems containing substantial residual stresses.