报告题目：Projectile Penetration of High-strength Fabric

　　报告人：Prof. Victor P.W. Shim (National University of Singapore)

　　报告时间：2015年8月31日（周一）下午3:00

　　报告地点：5号楼502-1会议室

　　报告人简介：

　　Victor Shim is a Professor of Mechanical Engineering at the National University of Singapore (NUS). His current research interests include dynamic material behaviour, cellular materials, penetration of high-strength fabrics, and projectile impact on protective structures. He established the Impact Mechanics Laboratory at NUS and is an Associate Editor of the International Journal of Impact Engineering. He went to the University of Auckland in 1973 to pursue his Bachelor’s degree, supported by a scholarship from the New Zealand government. Subsequently, he returned to Singapore to fulfil three years of military service as an artillery officer. Thereafter, he was appointed an academic tutor at NUS, and concurrently undertook research for his Master’s degree. He then proceeded to Cambridge University in 1982 on an NUS scholarship and did his PhD in Impact Mechanics, returning in 1986 to a faculty position at NUS. He has been a Visiting Scientist at the Tokyo Institute of Technology and a Visiting Scholar at UC San Diego. He has received numerous awards for Teaching Excellence and Innovative Teaching, has held several university-level management appointments, and is currently a Vice-Dean of the Engineering Faculty.

　　报告摘要：

　　High-strength fabrics possess favourable characteristics, such as flexibility, and excellent specific strength, because of their light weight and high tensile strength of constituent fibres. These give them properties suitable for applications in protection against impact – e.g. bullet-resistant body armour and barriers for turbine engine fragments. Moreover, such fabrics can also be combined with metals to form lightweight, high-performance laminates used in aircraft structures, or reinforcement to enhance the flexural/tensile strength of brittle construction materials like concrete. Some recent work on the ballistic response of high-strength fabrics will be presented. The dynamic properties of yarns that constitute a fabric are examined, since they determine the impact response of fabrics; this information is also required for computational simulation of such material. The influence of strain rate and the weaving process on yarn properties are also studied. How high-strength fabrics respond to projectile impact is investigated, and high-speed photography is employed to observe deformation and failure, and to identify the governing mechanisms. In addition, the influence of impact angle on the ballistic performance of fabric is characterized. Computational modelling of projectile penetration of fabric is undertaken, and models with various degrees of complexity are introduced, together with their ability to estimate the ballistic resistance of high-strength fabric.