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首页> 外文会议>ASME International Mechanical Engineering Congress and Exposition >The Effect of a Quarter-Circle Corner Crack on the Distribution of the SIF along the front of a Non-Aligned Semi-Elliptical Surface Crack in an Infinitely Large Plate under Uniaxial Tension
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The Effect of a Quarter-Circle Corner Crack on the Distribution of the SIF along the front of a Non-Aligned Semi-Elliptical Surface Crack in an Infinitely Large Plate under Uniaxial Tension

机译：四分之一圆角裂缝对单轴张力下无限大板的非对齐半椭圆形表面裂纹前面沿着非对齐半椭圆形表面裂纹的分布的效果

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The evaluation of the mutual effect of non-aligned multiple cracks is a prerequisite in applying fitness-for-service codes. For non-aligned parallel cracks, during on-site inspection, one needs to decide whether the cracks should be treated as coalesced or separate multiple cracks for Fitness-for-Service. In the existing literature, criteria and standards for the adjustment of multiple nonaligned cracks are very source dependent, and those criteria and standards are often derived from on-site service experience without rigorous and systematic verification. Based on this observation, the authors previously reported on the influence of an embedded crack on an edge crack in 2-D scenarios and, more recently, in 3-D scenarios of the influence of a surface crack on a quarter-circle corner crack. However, realistic crack configurations detected using non-destructive methods are generally 3-D in nature and their influences are mutual. Thus the SIF distribution characteristics along the surface crack is equally important as the SIF distribution of the corner crack when Fitness-for-Service rules are to be applied. Therefore, non-aligned flaws with different configurations and shapes and the SIFs along their crack fronts are deemed necessary in order to obtain more practical guidance in the usage of rules speculated in Fitness-for-Service codes. In this study, the characteristics of the SIF distribution along a semi-elliptic non-aligned surface crack is examined under the influence of a quarter-circle corner crack of various geometries in an infinitely large plate. For any given geometry of a quarter-circle corner crack, a pair of horizontal (H) and vertical (S) separation distances between the two cracks is chosen followed by a detailed analysis of the effect of the quarter-circle corner crack on the 3D SIFs of the surface crack at different ellipticities. The analysis is repeated for various combinations of separation distances S and H. The results from this study are collectively significant to the understanding of the correlation between the criteria and standards in Fitness-for-Service community and the consequence of their usage in engineering practice.
机译：非对准多裂缝相互影响的评价是应用健身码的先决条件。对于非对准的平行裂缝，在现场检查期间，需要决定裂缝是否应被视为合并或分离用于健身适应性的多个裂缝。在现有的文献中，多个非基本裂缝调整的标准和标准是依赖性的非常非常源性，并且这些标准和标准通常来自现场服务经验，没有严格和系统的验证。基于这种观察，提交人以前报道了嵌入式裂缝对2-D场景的边缘裂缝的影响，最近，在四分之一圆角裂缝对表面裂纹的影响的3D场景中。然而，使用非破坏性方法检测到的现实裂缝配置通常是3-D的，其影响是相互的。因此，沿着表面裂缝的SIF分布特性同样重要，因为当要施加健身规则时拐角裂缝的SIF分布。因此，认为需要具有不同配置和形状和沿其裂缝前沿的SIF的非对齐缺陷，以便在使用适用于适应性守则中推测的规则中的使用情况下获得更实际的指导。在该研究中，在无限大板中的各种几何形状的四分之一圆角裂缝的影响下，检查了SIF分布沿半椭圆形不排列的表面裂纹的特性。对于四分之一圆角裂缝的任何给定几何形状，选择了一对水平（h）和垂直于两个裂缝之间的分离距离，然后详细分析了四分之一圆角裂缝对3D的效果表面裂纹的SIF在不同的椭圆形。对分离距离S和H的各种组合重复该研究的分析。本研究的结果是统称对理解健身界中的标准和标准之间的相关性以及其使用在工程实践中的后果之间的相关性。

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