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

0138400Jiles描述：该奖项支持美国和印度的合作研究，题为疲劳损伤和变形的磁性评估。艾奥瓦州立大学的David Jiles和Jamshedpur国家冶金实验室的Amitava Mitra将进行先进的无损评估(NDE)，通过使用磁力显微镜和扫描霍尔传感器显微镜对材料结构进行微米级的测量。这些将提高对微结构和磁性之间关系的理解，然后可以用来解释传统的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中的磁化过程进行数学建模来分析。研究的目标是获得关于如何可靠地使用磁性检测方法来推断疲劳和变形过程中结构和应力状态变化的具体细节。这将极大地提高磁性检测技术估计部件剩余寿命的预测能力。范围：磁性测量可以确定材料的疲劳损伤和变形的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。对于社会来说，检测到部件即将出现的故障可能会对民用、航空航天和机械结构产生重大影响。贾尔斯是美国使用磁性方法进行无损检测的权威。与国家冶金实验室的印度科学家的合作将利用两个实验室的优势。根据这笔赠款，两名美国研究生将有机会参加位于Jamshedpur的国家冶金实验室的实验工作。该项目得到了印度科技部(DST)、美国国家科学基金会国际科学与工程办公室以及土木工程与机械系统司的支持。

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.