Constraint-corrected J (CTOD) resistance curves for strain-based design of pipelines

基于应变的管道设计的约束校正 J (CTOD) 阻力曲线

• 批准号: 405856-2010
• 负责人: Zhou, Wenxing
• 金额: $ 3.22万
• 依托单位: University of Western Ontario
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2012
• 资助国家: 加拿大
• 起止时间: 2012-01-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=498533
• 关键词: Constraint; corrected; CTOD; resistance; curves

The strain-based methodology is widely considered as the only viable option for designing pipelines subjected to large plastic deformations, e.g. pipelines subjected to frost heave- and thaw settlement-induced ground movements. The tensile strain capacity of the pipeline girth weld is of critical importance to the strain-based design of pipelines because it is one of the governing factors for the selection of the pipe and weld materials as well as the qualification of the welding process. To accurately evaluate the tensile strain capacity of the pipeline girth weld, which in general contains imperfections introduced by the welding process, a wide-plate test or material fracture toughness is needed for a direct or indirect assessment. The objective of the proposed project is to develop constraint-corrected fracture toughness resistance curves for medium- to high-strength pipeline steels and pipeline girth welds, and an analytical procedure to predict the tensile strain capacity of the wide plate. The research will be carried out for a period of three years with the cash and in-kind supports from TransCanada. One postdoctoral fellow (PDF) and one PhD student will be trained in the project.

基于应变的方法被广泛认为是设计受大塑性变形的管道的唯一可行选择，例如受冻胀和融化沉降引起的地面运动的管道。管道环焊缝的拉伸应变能力对管道应变设计至关重要，它是管材和焊缝材料选择以及焊接工艺质量的决定因素之一。管道环焊缝通常包含焊接过程中引入的缺陷，为了准确评估其拉伸应变能力，需要进行宽板试验或材料断裂韧性的直接或间接评估。本课题的目标是建立中高强度管道钢和管道环焊缝的约束校正断裂韧性抗力曲线，以及预测宽板拉伸应变能力的分析方法。这项研究将在横加公司的现金和实物支持下进行三年。本项目将培养1名博士后（PDF）和1名博士生。