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首页> 外文期刊>Engineering failure analysis >Fracture toughness prediction of a valve body: Numerical analysis
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Fracture toughness prediction of a valve body: Numerical analysis

机译：阀体断裂韧性预测：数值分析

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The crack repair technique by "crack grinding", due to its efficiency, has been widely used to extend the service life of the cracked structural components. The "crack grinding" technique is carried out by removing the materials which contains the crack. So it is of great importance to study the effects of this repair technique. In this paper, the finite element method is used to analyse the behavior of repaired cracks in mode I by computing the stress-intensity factors at the crack tip. 3D numerical simulation was carried out to model the steam governor valve in a coal-fired thermal power plant with a semi-elliptic crack. Since no extra auxiliary solutions are required for the computation, the proposed method appears to be visual and can be used for evaluation of the associated stress-intensity factors. The plot of the stress-intensity factors according to the crack length in mode I, shows that the stress-intensity factor exhibits an asymptotic behavior as the crack length increases. It's to be noted that a transition zone allows connecting the refined specific crack tip mesh to the global structural discretization. So this technique can be used for complex industrial structures.
机译：由于其效率，通过“裂纹研磨”进行的裂纹修复技术已被广泛用于延长裂纹结构部件的使用寿命。 “裂纹研磨”技术是通过去除包含裂纹的材料来进行的。因此，研究这种修复技术的效果非常重要。本文采用有限元方法，通过计算裂纹尖端的应力强度因子，分析了Ⅰ型修复裂纹的行为。进行了3D数值模拟，以模拟具有半椭圆形裂纹的燃煤热电厂的蒸汽调节阀。由于不需要额外的辅助解决方案进行计算，因此所提出的方法看起来很直观，可以用于评估相关的应力强度因子。应力强度因子根据模式I中裂纹长度的关系图表明，随着裂纹长度的增加，应力强度因子呈现渐近行为。要注意的是，过渡区允许将精炼的特定裂纹尖端网格连接到整体结构离散化。因此，该技术可用于复杂的工业结构。

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