Magnetic Non-Destructive Evaluation (NDE) techniques for strain measurement in engineering components

用于工程部件应变测量的磁性无损评估 (NDE) 技术

• 批准号: 203311-2012
• 负责人: Clapham, Lynann
• 金额: $ 1.46万
• 依托单位: Queen's University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=569927
• 关键词: Magnetic; Non; Destructive; Evaluation; NDE

Safety is of the utmost concern for industries which involve large scale infrastructure such as nuclear power plants and oil and gas transmission pipelines. Failure of this infrastructure can have serious environmental effects, inflict costly property damage, and result in loss of human life. Non-destructive evaluation (NDE) techniques have been developed to inspect engineering components (e.g. oil and gas pipelines, nuclear power plant tubing) to ensure they operate safely and efficiently. The proposed research program focuses on magnetic NDE techniques. Since magnetism is stress-sensitive, these techniques can detect high stress levels in engineering components before failure occurs. The proposed NSERC Discovery grant funding will support on-going work that examines how stresses in steel affect the signals when magnetic NDE methods are used to examine engineering components. On a microscopic level, stresses are not uniform, but partition themselves into different directions in the microcrystals - some directions carry very high stresses, while others carry little stress. Such microscopically distributed stresses are called intergranular stresses. Dr. Clapham's earlier work has shown that magnetism itself is sensitive more to intergranular stresses in particular directions, rather than to the overall stress pattern. This early work was conducted primarily on simple laboratory samples, however in order to be directly relevant to industrial NDE it is necessary to examine intergranular stresses in real engineering components and determine how they create a magnetic signature. The proposed study for NSERC Discovery Grant funding involves an examination of the intergranular stresses and magnetic signatures associated with dents and gouges in real pipeline sections. The understanding gained from this fundamental study will be applied to other industrially-funded work in Dr. Clapham's research group, to improve signal interpretation from magnetic NDE techniques and also to develop more effective NDE instruments. No other group in Canada works in this field, thus the students involved in this work gain highly specialized and sought after skills and training.

对于核电站和油气输送管道等涉及大型基础设施的行业来说，安全是最令人担忧的问题。这些基础设施的故障可能会对环境造成严重影响，造成代价高昂的财产损失，并导致生命损失。开发了无损评估(NDE)技术来检查工程部件(如石油和天然气管道、核电站管道)，以确保它们安全高效地运行。拟议的研究计划侧重于磁性无损检测技术。由于磁性是应力敏感的，这些技术可以在故障发生之前检测到工程部件中的高应力水平。 拟议的NSERC发现拨款将支持正在进行的工作，即在使用磁性无损检测方法检查工程部件时，检查钢中的应力如何影响信号。在微观层面上，应力并不是一致的，而是在微晶体中将自己划分为不同的方向--一些方向承受着非常高的应力，而另一些方向则承受着很小的应力。这种微观分布的应力称为晶间应力。克拉帕姆博士早期的工作表明，磁性本身对特定方向的晶间应力比整体应力模式更敏感。这项早期工作主要是在简单的实验室样品上进行的，然而，为了与工业无损检测直接相关，有必要检查实际工程部件中的晶间应力，并确定它们如何产生磁性特征。NSERC Discovery Grant Funding的拟议研究涉及对实际管道区段中与凹痕和沟槽相关的晶间应力和磁性特征的检查。从这项基础性研究中获得的理解将应用于Clapham博士研究小组的其他工业资助工作，以改进来自磁性无损检测技术的信号解释，并开发更有效的无损检测仪器。加拿大没有其他团体从事这一领域的工作，因此，参与这项工作的学生获得了高度专业化和受欢迎的技能和培训。