US-India Cooperative Research: Magnetic Evaluation of Fatigue Damage and Deformation

描述：该奖项支持美印合作研究，题为疲劳损伤和变形的磁性评估。合作者，爱荷华州立大学的David Jiles和Jamshedpur国家冶金实验室的Amitava Mitra将通过磁力显微镜和扫描霍尔传感器显微镜进行先进的无损评估（NDE），以获得微米尺度上材料结构的测量结果。这将提高对微观结构和磁性之间关系的理解，然后可以用来解释传统磁性无损检测的结果。测量数据将通过使用磁性Preisach模型的新方法对材料的磁化过程进行数学建模来分析。研究的目标是获得具体的细节，如何磁检测方法可以可靠地用来推断在疲劳和变形过程中的结构和应力状态的变化。这将大大提高磁检测技术的预测能力，以估计部件的剩余寿命。磁测量可以确定材料的疲劳损伤和变形，这一想法对工程师和材料科学家的科学界具有巨大的潜力和高度的相关性。对于社会而言，检测部件即将发生的故障可能对民用、航空航天和机械结构产生重大影响。Jiles是美国使用磁性方法进行濒死体验的权威。与印度国家冶金实验室科学家的合作将利用两个实验室的优势。在这项资助下，两名美国研究生将有机会参加贾姆谢德布尔国家冶金实验室的实验工作。该项目得到了印度科技部（DST）、国家科学基金会国际科学与工程办公室以及土木与机械系统部门的支持。

0138400Jiles Description: This award supports the US-India cooperative research entitled Magnetic Evaluation of Fatigue Damage and Deformation. Collaborators David Jiles, Iowa State University and Amitava Mitra, National Metallurgical Laboratory, Jamshedpur will conduct advanced Non-Destructive Evaluations (NDE) to obtain measurements on the structure of materials at the micrometer scale by using magnetic force microscopy and scanning Hall sensor microscopy. These will improve understanding of the relationships between microstructure and magnetic properties, which can then be used to interpret the results of traditional magnetic NDE measurements. The measurement data will be analyzed through mathematical modeling of the magnetization processes in materials using a new approach to the magnetic Preisach model. The research goal is to obtain specific details on how magnetic inspection methods can reliably be used to infer changes in structure and stress states during fatigue and deformation processes. This will greatly enhance the predictive capabilities of magnetic inspection techniques for estimating the remaining lifetime of components.Scope: The idea that magnetic measurements could determine fatigue damage and deformation in materials has great potential and high relevance for the scientific community of engineers and materials scientists. For society, detection of impending failure in components could have significant impact for civil, aerospace, and mechanical structures. Jiles is the authority in the United States on using magnetic methods for NDE. The collaboration with the Indian scientists at National Metallurgical Laboratory will leverage the strengths of both laboratories. Under this grant, two US graduate students will have the opportunity to participate in the experimental work at the National Metallurgical Laboratory in Jamshedpur. This project is supported by the Indian Department of Science and Technology (DST) and by NSF's Office of International Science & Engineering and the Division of Civil and Mechanical Systems.