报告题目： Fatigue Crack Closure Revisited
报告人 ： Professor Jie Tong, Mechanical Behaviour of Materials (MBM) Laboratory, School of Engineering, Portsmouth University, UK
Abstract: Fatigue crack closure is one of the most extensively researched topics in the fatigue-fracture community with reported some 10,000 papers published since Elber (1970). Although the concept has been widely accepted with the phenomenon well-reported from compliance measurements, direct measurement of the impact of crack closure on crack driving force has been difficult till recently, when full‐field techniques such as Digital Image Correlation (DIC) become available. In this talk, full-field of a fatigue crack will be examined using DIC. The surface crack opening displacements in 2D and 3D specimens were measured at selected locations behind the crack tip. The stress intensity factor K was estimated from the Williams series expansion by using the displacements obtained from DIC. The results present a complete picture of the crack tip field at the selected load levels, where events both ahead and behind of the crack tip were studied in crack driving and attenuation effects.
Biography of Professor Jie Tong
Professor Tong leads the Mechanical Behaviour of Materials (MBM) group at the University of Portsmouth. She joined the University of Portsmouth in 1996 as a Senior Research Fellow, after a Ph.D on mixed mode fracture from the University of Sheffield and a brief period of postdoctoral research on matrix cracking of laminated composites at the University of Surrey. She was appointed to Reader (2003) and Professor and Head of MBM Laboratory (2006). She also served as Associate Dean for Research, Faculty of Technology, University of Portsmouth (2010-2014).
Her current research interests are in the area of mechanics of materials and biomechanics, focusing on deformation, fatigue and fracture behaviour of engineering and biological materials and systems. There are essentially two main questions they try to answer: how materials and components respond to complex loading conditions; and how micro-structural properties dictate global material or structural responses. She collaborates with industrial partners on fatigue and fracture of aero-engine materials; and with NHS hospital colleagues on biomechanical behaviour of implants and scaffolds. Their research has been funded by the EPSRC, MRC, the Royal Society, TSB and Arthritis Research UK.