【复材专家系列22】Representativeness in Material Characterisation

发布者:Yang 日期:2024/1/2 浏览次数: 43次

Professor Shuguang LI

Professor of Aerospace Composites

University of Nottingham, UK

时    间 :  2024年01月08日 10:00-11:00

地    点：紫金港校区合同苑9幢 材1-210 报告厅

邀请人 ：彭华新 教授

Abstract

Material characterisation is a necessary process before any material could be adopted by scientists and engineers in their applications.  Modern developments in material science and technology have given rise to many new materials of distinct features, such as meta materials, auxetic materials, lattice as well as structural materials like textile composites.  Correctly characterising them is a delicate job.  Experimental characterisation requires specimens to be appropriately sized, establishment of which is a costly exercise.  Its counterpart in numerical characterisation through multiscale modelling is the correct introduction of representative volume elements.  Common practices tend to pay too much attention to the ‘volume elements’, but not enough attention to its ‘representative’-ness.  For many, it might not even seem clear what representativeness meant in the first place.

The presentation will address the following questions:

·         What does representativeness mean?

·         Why a volume element should be representative?

·         When a volume element can be considered to be representative?

·         What is the difference between a representative volume element (RVE) and a unit cell (UC)?

·         How can a UC be representative?

Biosketch

Shuguang Li, Professor of Aerospace Composites, is a part of the Institute for Aerospace Technology, Faculty of Engineering, University of Nottingham, UK.  He obtained his PhD from University of Manchester in 1993 and was appointed to his present position in 2012.  He was one of the two advisors to the 2^nd World Wide Failure Exercise for polymer composites (on 3D failure theories) and one of the four organisers for the 3^rd Exercise of the same (on damage theories).  The outcomes have been published in Journal of Composite Materials.  His recent research on the subject of composites failure criteria has led a number of publications aiming at the rationalisation of existing criteria, so that users will be able to apply them to the limit of their applicability with confidence.  He is on the editorial board of International Journal of Mechanical Sciences.  He is a visiting professor at Nanjing University of Aeronautics and Astronautics, Zhejiang University and Northwest Polytechnical University, China.  He has published over 100 research papers, most of them in highly reputable international journals.  His main research interest is in the area of analysis of composite materials and structures, in particular, on subjects of damage and failure, micromechanics and characterisation.  

As an outcome of his research on micromechanical modelling of composites, a monograph entitled ‘Representative Volume Elements and Unit Cells ¾ Concepts, Theory, Applications and Implementation’ was published by Elsevier in 2020.  A Chinese version of the book as a new edition has recently been published by Science Press under the title of 现代复合材料多尺度数值表征方法 ¾ 代表性体元与单胞的概念、理论与应用.  An open-source software named as UnitCells© has also been made available by Elsevier and Science Press online, which offers material scientists and structural designers a useful tool for the characterisation of modern materials in terms of effective properties of elasticity, thermal expansion, and thermal and electric conductivity.

欢迎感兴趣的老师同学参会交流！

浙大复材专家系列讲座  第22期

InCSI Special Composites Seminar  No. 22