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Finite element analysis of creep-fatigue-oxidation interactions in 316H stainless steel
Engineering Failure Analysis ( IF 4 ) Pub Date : 2020-07-06 , DOI: 10.1016/j.engfailanal.2020.104709
Saeed Z. Chavoshi , Vito L. Tagarielli , Lei Zhao , Kamran Nikbin

Material degradation and crack growth affect the residual service life of high temperature components used in power plants and aerospace industry. In this study, we present a predictive multiscale continuum damage model to account for the effects of creep, fatigue and oxidation on the damage evolution and crack growth behaviour of 316H stainless steel at 650 °C. The model is used in finite element predictions of mode I crack growth which explicitly considers the polycrystalline microstructure near the crack tip of a compact-tension specimen loaded in creep and fatigue at high temperature. The predicted crack growth rates are found to be in good quantitative agreement with measurements and with the bounds predicted by the approximate multiaxial ductility model. We discuss the relative importance of creep, fatigue and oxidation on the damage evolution in different loading regimes.



中文翻译:

316H不锈钢中蠕变-疲劳-氧化相互作用的有限元分析

材料降解和裂纹扩展会影响发电厂和航空航天业中使用的高温组件的剩余使用寿命。在这项研究中,我们提出了一种预测性的多尺度连续损伤模型,以说明蠕变,疲劳和氧化对650H下316H不锈钢的损伤演变和裂纹扩展行为的影响。该模型用于模式I裂纹扩展的有限元预测中,该模式明确考虑了在高温下蠕变和疲劳下加载的紧凑张力试样裂纹尖端附近的多晶微观结构。发现预测的裂纹扩展速率与测量值和近似的多轴延性模型预测的边界具有良好的定量一致性。我们讨论蠕变的相对重要性,

更新日期:2020-07-06
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