Guidance for structural integrity assessment of smooth pipe elbows containing defects using R6

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL International Journal of Pressure Vessels and Piping Pub Date : 2024-10-29 DOI:10.1016/j.ijpvp.2024.105353

Yuebao Lei

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Abstract

Recently, guidance for fracture assessment of defective elbows using the R6 failure assessment diagram (FAD) method has been included in R6 Revision 4 Amendment 13 (2023). This paper provides an overview of the new guidance and supporting validation. The guidance is validated using 75 cases of 3-D finite element (FE) elastic-plastic J results of smooth pipe elbows of various geometries with axial/circumferential internal/external semi-elliptical/extended/fully-circumferential surface cracks under internal pressure, in-plane/out-of-plane bending moment, torsion and various load combinations, by comparing the FE-based Option 3 failure assessment curves (FAC) with the R6 Option 2 FAC. The results show that, for 74 out of 75 cases, the FE-based Option 3 data points are above the R6 Option 2 FAC with reasonable conservatism when the guidance for evaluating the elbow stress intensity factor and limit load is followed. In other words, following the new guidance can lead to reasonably conservative assessment results.

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使用 R6 对含有缺陷的光滑管道弯头进行结构完整性评估的指南

最近，使用 R6 失效评估图 (FAD) 方法对有缺陷的弯头进行断裂评估的指南已纳入 R6 修订版 4 第 13 修正案（2023 年）。本文概述了新指南和支持性验证。通过比较基于有限元的方案 3 失效评估曲线 (FAC) 和 R6 方案 2 失效评估曲线 (FAC)，使用 75 个三维有限元 (FE) 弹性-塑性 J 结果验证了该指南，这些三维有限元 (FE) 结果是各种几何形状的光滑管道弯头在内部压力、平面内/平面外弯矩、扭转和各种载荷组合作用下出现轴向/环向内部/外部半椭圆形/延伸/全环形表面裂纹的结果。结果表明，在 75 个案例中，有 74 个案例的基于 FE 的方案 3 数据点高于 R6 方案 2 的 FAC，并且在评估肘部应力强度因子和极限载荷时遵循了合理的保守原则。换句话说，遵循新指南可以得到合理保守的评估结果。

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来源期刊

International Journal of Pressure Vessels and Piping 工程技术-工程：机械

CiteScore

5.30

自引率

13.30%

发文量

208

审稿时长

17 months

期刊介绍： Pressure vessel engineering technology is of importance in many branches of industry. This journal publishes the latest research results and related information on all its associated aspects, with particular emphasis on the structural integrity assessment, maintenance and life extension of pressurised process engineering plants. The anticipated coverage of the International Journal of Pressure Vessels and Piping ranges from simple mass-produced pressure vessels to large custom-built vessels and tanks. Pressure vessels technology is a developing field, and contributions on the following topics will therefore be welcome: • Pressure vessel engineering • Structural integrity assessment • Design methods • Codes and standards • Fabrication and welding • Materials properties requirements • Inspection and quality management • Maintenance and life extension • Ageing and environmental effects • Life management Of particular importance are papers covering aspects of significant practical application which could lead to major improvements in economy, reliability and useful life. While most accepted papers represent the results of original applied research, critical reviews of topical interest by world-leading experts will also appear from time to time. International Journal of Pressure Vessels and Piping is indispensable reading for engineering professionals involved in the energy, petrochemicals, process plant, transport, aerospace and related industries; for manufacturers of pressure vessels and ancillary equipment; and for academics pursuing research in these areas.