Title: Multiscale modelling of multiple-cracking tensile fracture behaviour of engineered cementitious composites
Speaker: Dr. Y.X. Zhang (School of Engineering and Information Technology, UNSW Canberra, at the Australian Defense Force Academy, ACT, 2600, Australia)
Time: Monday, May 9, 2016, 19:30
Venue: Lecture Hall, Building No.7, Wushan Campus
Abstract:
A hierarchical multiscale modelling approach is developed to analyse the strain-hardening and multiple-cracking fracture behaviour of engineered cementitious composites (ECC) under uniaxial tension. A combined analytical-numerical approach is proposed for effective implementation of the hierarchical multiscale modelling. A simplified multi-linear crack bridging relationship is proposed based on the analytical crack bridging model to account for the aggregate bridging efforts of fibres for a single crack at a lower mesoscale. A representative volume element (RVE) model accounting for random fluctuations of internal material properties and sequentially occurred cracking is developed at an upper mesoscale. The RVE model is analysed using the finite element method, and multiple cracks with a cohesive constitutive model of the simplified multi-linear crack bridging relationship are adaptively introduced within the prospective elements by means of the extended finite element method (XFEM). The macroscopic tensile properties of the ECC are obtained based on the homogenised tensile response of the RVE model. The tensile behaviour of a polyvinyl alcohol fibre reinforced ECC (PVA-ECC) is modelled and the effect of the size of the RVE and the uniformity of fibre distribution on the mechanical behaviour are also studied to demonstrate the effectiveness and accuracy of the proposed multiscale modelling approach and implementation method. Very good agreement between the numerical and experimental results validates the development numerical framework.
Brief Biography of Dr. Y.X. Zhang
Dr. Zhang is a Senior Lecturer in Engineering in School of Engineering and Information Technology at the University of New South Wales, Canberra, Australia. She obtained her Bachelor degree on Engineering Mechanics and Master degree on Solid Mechanics from Tianjin University in 1992 and 1995 respectively, and PhD on Structural Engineering from the University of Hong Kong in 2001. She worked as a Postdoctoral research fellow in the University of Queensland, Pohang University of Science and Technology, South Korea and the University of New South Wales since 2001 to 2005. She started her academic career from 2005 working as a Lecturer on Civil Engineering in the University of New South Wales and was promoted to be Senior Lecturer in 2009.
Her expertise is on the development of advanced finite element method and nonlinear finite element analysis and modelling of engineering structures especially under extreme loadings such as fire loading, impact and blast loading. She has been working on the research of composite materials including construction and building materials and structures since 2004. Her main focuses are on the characterization of mechanical behaviour of composite materials by experimental and numerical methods and simulation of structural behaviour of composite structures.
Dr. Zhang has published over 150 research articles in international journals and conferences since 1999 with over 50 SCI papers published in leading international journals on Computational Mechanics and Composite Structures. She is the Associate Editor of International Journal of Recent Patents in Mechanical Engineering since 2009 and the editorial board member of International Journal of Composite Materials since 2011. She is an advisory board member and international technical committee member of several international conferences. She has been a frequent reviewer for up to 20 international journals including the topic journals in the area of Computational Mechanics and Composite materials and structures. She is a member of International Association for Computational Mechanics, Australian Association of Computational Mechanics, International Institute for FRP in Construction (IIFC), Australian Composite Structures Society, and International Association of Protective Structures (IAPS) and Australian Chapter.
Announced by School of Civil Engineering and Transportation