学术报告通知：

报告题目：Random Heterogeneous Fracture: Modelling and In-situ XCT Tests

报告人：杨贞军 博士

报告人单位：The University of Manchester, UK

时  间：2012年4月11日（星期三）上午9:00

地  点：农水楼四楼重点实验室学术报告厅

报告摘要：
  Fracture is inherent in many composite materials such as concrete, and is a major contributor to material nonlinearity and culprit to structural failure. Computer modelling of crack propagation plays an important role in assessing structural integrity and reliability to fracture and residual load-carrying capacity. This talk will summarise our recent effort on finite element modelling of complex 2D and 3D fracture in quasi-brittle materials considering random heterogeneous fracture properties, using a simple yet effective method developed in association with Abaqus. In this method, potential cracks are represented by pre-inserted cohesive elements with traction-separation softening constitutive laws modelled by spatially-varying Weibull random fields. Extensive Monte Carlo simulations of small-sized concrete specimens under uni-axial tension were carried out. To directly validate computer models, in-situ X-ray Computed Tomography (XCT) tests were carried out to obtain mesoscale internal structures of concrete specimens under compressive loadings with initial results discussed.

杨贞军博士简介：
 Dr Zhenjun Yang is a Senior Lecturer in Structural Engineering at School of Mechanical, Aerospace and Civil Engineering, the University of Manchester UK. His research interests include numerical modelling techniques (FEM and SBFEM), fracture mechanics, concrete and cable-stayed structures under impact and blast, and FRP strengthening techniques of concrete and steel structures. He has secured over £500K research grant as sole Principal Investigator from EPSRC and Royal Society UK etc. and has published over 90 international journal and conference papers. He has received a 2011 Humboldt Research Fellowship for Experienced Researchers, 2011 Young Investigator Award from International Chinese Association of Computational Mechanics, a 2009 Best Paper Award on Computational Mechanics from ACME UK, and a 2004 PE Publishing Award (for a best paper) from IMechE UK.

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