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Test-based fracture criteria for pipeline steels

基于试验的管线钢断裂标准

基本信息

批准号：
572810-2022
负责人：
Imanpour, AliA
金额：
$ 5.65万
依托单位：
University of Alberta
依托单位国家：
加拿大
项目类别：
Alliance Grants
财政年份：
2022
资助国家：
加拿大
起止时间：
2022-01-01 至 2023-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=748958
关键词：
Test based fracture criteria pipeline

项目摘要

Steel pipelines, as key Canadian infrastructure, are often exposed to various geological and environmental conditions that cause defects such as cracks, dents, and gouges in the pipe wall, which can lead to pipe fracture in pipelines, compromising the entire functionality of pipelines and resulting in significant economic losses, environmental issues or even fatalities. There are several methods to predict the fracture capacity, including experimental testing, analytical approaches, and advanced numerical methods. The application of the fixed fracture strain criterion implemented in the computer programs may not appropriately predict the crack propagation path because of the concentration of large strains. Furthermore, fracture criteria that ignore the crack tip constraints and depend on the type of test specimens used to obtain fracture indices may lead to inconsistent predictions. There is a need to develop and implement more efficient and accurate fracture criteria specific to pipe steel as a function of crack tip constraints, independent of the type of specimens used and the size of pre-cracking. This research project aims at developing calibrated numerical-based fracture criteria for predicting the crack propagation in steel pipelines. The criteria developed in this project will take into consideration the constraints at the crack-tip specific to various loading conditions and will be applicable to various steel grades used to manufacture pipes, providing the pipeline industry in Canada with an enhanced method to assess and design pipelines.

钢质管道作为加拿大的关键基础设施，经常暴露在各种地质和环境条件下，导致管壁出现裂纹、凹陷、挖沟等缺陷，导致管道断裂，影响管道的整体功能，造成重大的经济损失、环境问题甚至人员伤亡。预测断裂能力的方法有几种，包括实验测试、分析方法和先进的数值方法。由于大应变的集中，在计算机程序中应用固定断裂应变准则可能不能很好地预测裂纹的扩展路径。此外，忽略裂纹尖端约束并依赖于用于获得断裂指数的试验试件的类型的断裂准则可能导致不一致的预测。需要制定和实施更有效和更准确的断裂准则，作为裂纹尖端约束的函数，而不受所使用的试件类型和预裂尺寸的影响。本研究项目旨在开发用于预测钢管中裂纹扩展的校准的基于数值的断裂准则。该项目制定的标准将考虑到裂纹尖端针对不同加载条件的约束，并将适用于用于制造管道的各种钢种，为加拿大的管道行业提供了一种改进的评估和设计管道的方法。