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报告题目：Needs and Challenges for Ensuring Structural Integrity, Reliability and Safety for Gas Turbines – Fatigue Lifing Assessment and Prediction
报告人：  Dr. M.-H. Herman Shen, Professor & ASME Fellow
Department of Mechanical & Aerospace Engineering
The Ohio State University, Columbus, Ohio, U.S.A.
报告时间：2011年8月16日上午9：00-11：00
报告地点：澳门沙金网址2158二楼会议室
 
报告摘要 ：
Most load-carrying structural systems such as gas turbine engines, aircraft, underwater pipelines, power generators, 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 aircraft engine 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 gas turbine engine 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 gas turbine engines. 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.Various approaches and different alternatives to the tough challenge in accomplishing safety for in-service gas turbine engines using condition/knowledge-based health management systems will be also presented.
 
报告人简介：
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.