主  办：爆炸科学与技术国家重点实验室

　　         安全与防护协同创新中心

　　报告题目：Hydrocode Simulation of Advanced Ceramic Materials based on the Universal Empirical Model for Ceramics

　　报告人：Prof. Yuan Jianming

　　Nanyang Technological University, Singapore

　　时间：2019年6月12日上午09:00

　　地点：北京理工大学3号教学楼146会议室

　　报告人简介：

　　Dr Yuan Jianming is a principal research scientist in the research area of protective materials in Temasek Laboratories @ Nanyang Technological University (TL@NTU). He has been with TL@NTU since 2009. He is the principal investigator and the team leader of the research team in the Ma Jan High Speed Dynamics Laboratory in TL@NTU. He received his B.Eng. (Mechanical Engineering) in 1986 and Ph.D. (Solid Mechanics) in 1993 from the University of Science and Technology of China. After graduation, he worked in the University of Science and Technology of China as a professor (1994‐1995). He was a visiting professor in the University of Tokyo (1995‐1998) and a senior research fellow in the National University of Singapore (1998‐2001). He also worked in a spin‐off company of the National University of Singapore (2002‐2008). His research interests broadly in mechanics of materials include protective materials and structures, high speed impact, dynamic behavior of materials. He has done significant research work in his research areas with publication of journal papers and conference presentations. He has received a number of best paper awards at international conferences and being an invited speaker at these conferences.

　　报告摘要：

   Spinel (MgAl2O4 ceramic) and SMC (Zirconia shape memory ceramic) are advanced ceramic materials in application of protective structures. SMC powder provides high energy absorption capability meanwhile Spinel tiles display properties of both high transparency and high hardness. Ballistic properties of SMC and Spinel, such as HEL (Hugoniot Elastic Limit), at high pressure and high speed loading are lacked in literature as they are newly developed materials; therefore, it is challenging in structure design where these new and advanced ceramics are applied. The extended MC (Mohr-Coulomb) empirical model, which is able to describe response of most brittle materials subject to high speed impact and high pressure loading. In hydrocode simulation taking account of the extended MC empirical model, the piecewise MC yield surface with a Tresca limit (the Mode-I of MAT_PSEUDO_TENSOR model in LS-DYNA) together with equation of state of pressure versus volumetric strain (the EOS_TABULATED_COMPACTION in LS-DYNA) are investigated to describe Spinel tile and SMC powder against high speed impact. Intact and failed ceramics are taken into account in simulation by applying solid-to-sph method. Comparison of the results between simulation and experiments are presented. It demonstrates that the proposed simulation procedures can be applied to investigate newly developed ceramics in the absence of extensive ballistic properties against high speed impact.