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A practical appraisal method for through-wall cracks in tubular structures

机译：管状结构贯穿墙裂缝的实用评估方法

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Tubular structures such as offshore platforms are used for various reasons, i.e. oil and gas exploration, navigation aid towers, bridges and causeways, ship loading and unloading facilities. These structures are mostly made of various grades of steel, from mild to high strength, i.e. 240 MPa to 360 MPa yield. In order to design members or components of tubular structures under static loads to avoid failure, collapse and buckling etc., design codes and standards are well established for specific applications, e.g. BS5950, BS5400 and EuroCode 3. However, the conventional design criteria are insufficient for designing engineering structures not containing flaws, since all structures contain flaws that may be caused by the manufacturing processes, fabrication or due to localized in-service damage. These flaws may grow by fatigue due to the application of repeated loads and this could lead to degradation in the structural strength with the possibility of catastrophic failures. Therefore, in order to perform a fracture assessment of tubular connections containing through-wall cracks of tubular structures, a 3D-submodel analysis of the selected connection has to be analyzed using full-scale dynamic finite element analyses, which is time is consuming. Hence, high performance computing facilities are required which are beyond the scope of conventional designers. Thus, a simplified method for estimating the performance of the tubular connection is introduced in this study. The results from the approximate method are then compared with those obtained from the full dynamic FE analyses.
机译：诸如海上平台的管状结构用于各种原因，即石油和天然气勘探，导航桥，桥梁和堤道，船舶装卸设施。这些结构主要由各种等级的钢制成，从轻度到高强度，即240MPa至360MPa产量。为了在静态载荷下设计管状结构的成员或部件，以避免故障，折叠和屈曲等，对于特定应用，设计代码和标准是完整的，例如， BS5950，BS5400和EUROCODE 3.然而，传统的设计标准不足以设计工程结构不含缺陷，因为所有结构都包含可能由制造工艺，制造或由于局部的在式造成的局部损坏而引起的缺陷。由于应用重复载荷的应用，这些缺陷可能会通过疲劳来增长，这可能导致结构强度降低，其可能性发生灾难性失败。因此，为了执行含有管状结构的通壁裂缝的管状连接的断裂评估，必须使用满量程动态有限元分析来分析所选连接的3D-Subsodel分析，这是时间是消耗的。因此，需要高性能计算设施，这些设施超出了传统设计人员的范围。因此，在本研究中介绍了一种用于估计管状连接性能的简化方法。然后将来自近似方法的结果与从全动态Fe分析中获得的结果进行比较。

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