Research and development of magnetic non-destructive testing techniques

在石油、天然气和核工业等影响较大的领域，失败的后果可能是灾难性的。我的工作涉及开发磁性无损评估（NDE）技术，以检测局部高应变区域，威胁工程系统的完整性和安全运行。基于磁力的技术最适合应变测量，因为其他方法（如涡流、超声波）对应变的敏感度要低得多。然而，在工程材料中，磁性行为与应变之间的关系是非常复杂的，并没有得到很好的理解。这项发现基金将进一步推动我的长期目标，即理解和利用铁磁工程材料中应变的磁响应。漏磁（MFL）和巴克豪森磁噪声（MBN）技术非常适合于应变测量。MFL用于寻找石油和天然气管道中的缺陷，但需要进一步发展以适应定位高应变区域，如凹痕和沟槽。MBN是寻找CANDU反应堆钢给料管受力区域的主要候选材料，但其使用存在许多实际障碍。拟议的拨款将资助三个项目：第一个研究磁性行为与“晶间”应变（特定晶体学方向的应变）之间的关系。第二项研究旨在描述和理解严重塑性变形钢的磁响应，使我们能够识别凹痕和沟槽的磁“特征”。discovery资助工作的第三个方面将着眼于使MBN探针适应工业使用的一些工程方面。最后，我的小组是加拿大唯一一个以大学为基础的小组，为学生提供磁工程方面的培训和经验。这种培训在以科学为基础的经济部门非常重要，我的毕业生在加拿大的高科技，石油和天然气以及核工业中找到了直接的就业机会。

In high-impact fields such as the oil and gas and nuclear industries, the consequences of failures can be catastrophic.  My work involves the development of magnetic non-destructive evaluation (NDE) techniques to detect areas of localized high strain which threaten the integrity and safe operation of engineering systems.  Techniques based on magnetism are the best suited to strain measurement, since other methods (e.g. eddy current, ultrasonic) are much less strain sensitive.  However, the correlation between magnetic behaviour and strain is very complex in engineering materials and not well understood.   This Discovery grant funding will further my long term goals of understanding and exploiting the magnetic response of strain in ferromagnetic engineering materials.     The Magnetic Flux Leakage (MFL) and Magnetic Barkhausen Noise (MBN) techniques are well suited to strain measurement. MFL is used to find defects in oil and gas pipelines, but further development is necessary to adapt it for locating high-strain regions such as dents and gouges.  MBN is a leading candidate for finding stressed regions in the steel feeder tubes used in CANDU reactors, but there are many practical obstacles to its use.   The proposed grant will fund three projects: The first examines the relationship between magnetic behaviour and "intergranular" strain (strain in a particular crystallographic direction). The second study aims to characterize and understand the magnetic response of severely plastically deformed steels, enabling us to recognize the magnetic "signature" of dents and gouges.  The third aspect of the Discovery-grant funded work will look at some of the engineering aspects in adapting MBN probes to use in industry.      Finally, mine is the only university-based group in Canada to provide students with training and experience in magnetics engineering.  This training is extremely important in the science-based economic sector, and my graduates have found immediate employment in Canada's high-tech, oil and gas, and nuclear industries.