学术报告：Needs and Challenges for Ensuring Structural Integrity, Reliability and Safety for Critical In-Service Components and Systems
报告题目：Needs and Challenges for Ensuring Structural Integrity, Reliability and Safety for Critical In-Service Components and Systems报 告 人：Dr. Herman Shen
报告时间：2011.08.18（星期四） 下午2:00——4:00
报告地点：嘉定园区学术活动中心一楼多功能厅
Dr. M.-H. Herman Shen, Professor & ASME Fellow
Department of Mechanical & Aerospace Engineering
The Ohio State University, Columbus, Ohio, U.S.A.
ABSTRACT
Most load-carrying structural systems such as gas turbine engines, aircraft, pipelines, nuclear power generation equipment, etc. are usually under severe operating conditions. These types of structures demand durability, high reliability, light weight, and high performance. Therefore, lifetime failure-free design criteria and real-time health monitoring tools have been adopted by the design and maintenance communities for ensuring safety of critical structural components. In this presentation, an energy-based fatigue life prediction framework will be presented for calculating the remaining useful life under multiple stress states found in the real hardware. The framework for the prediction of fatigue life via energy analysis was based on a new approach, which stated that the total strain energy accumulated during both a monotonic fracture process and a cyclic process is the same material property, wherein each may be determined by measuring the area beneath the monotonic true stress-strain curve and the area within a hysteresis loop, respectively. The goal of the work was to develop a finite element based tool for fatigue lifing of critical in-service structural components/systems. The final output of this finite element analysis is in the form of number of cycles to failure for each element in ascending or descending order. Therefore, the new finite element tool can provide the number of cycles to failure for each element. The second part of this dissertation is related to the development of a new Finite Element Methodology and lifing assessment for U10Mo Monolithic fuel mini plates subject to actual irradiation conditions. Three distinct research results will be presented: (1) fabrication induced residual stresses due to the high temperature exposure, (2) blister annealing to check the structural stability of the fabricated plates with consideration of the residuals; and finally (3) in-reactor mechanical behavior with the consideration of irradiation induced phenomena.
About the Speaker: Dr. Herman Shen: Professor of Mechanical & Aerospace Engineering, The Ohio State University, received his M.S. and Ph.D. degree in Aerospace Engineering from University of Michigan in 1986 and 1989, respectively. He joined the faculty of the Aerospace Engineering at The Ohio State University in August 1989. Other experiences include appointments as a visiting scholar at University of Tokyo in 1997, a visiting associate professor at Chinese University of Hong Kong in 1996, a Senior Visiting Scientist at the AFRL (the Air Force Research Labs) in 2000, and a Visiting Scholar at Institut de Genie Atomique, Lausanne, Switzerland in 1999. For the past twenty years, he has pioneered developments in structural health management framework and fatigue life prediction schemes for gas turbine engines, advanced composites, and adhesive joints. He is a recipient of the Air Force Research Initiation Award in 1991, ALCOA Science Foundation Award in 1995, and The Ohio State University College of Engineering Lumley Research Award in 2001. Dr. Shen has published more than 125 journal papers, book chapters, and technical reports.
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