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：HCP metals under Shock Loading
报告人：Prof. W.G. Proud
Institute of Shock Physics, Imperial College London, London, SW7 1AZ, United Kingdom
时间：2018年10月25日下午15:00
地点：北京理工大学3号教学楼146会议室
报告人简介：
Dr. Proud worked in Imperial College London from 2009 and now he is the director of the Institute of Shock Physics. He was closely involved with the foundation of the Royal British Legion Centre for Blast Injury Studies and is an associate director of the Institute of Security Science and Technology. He has undertaken research for a wide range of industrial organisations and government agencies. In 2013 he became the founding chair of the Shock Waves and Extreme Conditions Group of the Institute of Physics. He is the current chair of the Expert Advisory Group on Energetic Materials as part of the MoD-Industry funded Weapon Science and Technology Centre.
His main research interest is into high strain rate properties of a wide range of materials, both inert and energetic. To do this a number of techniques are used: Drop-weight, Hopkinson Bar, Taylor Impact, Plate Impact. The development of novel high-speed diagnostics and analysis methods is a long-term area. His is particularly interested in those materials which show a strongly non-linear behaviour in response, porous, granular, biological or composite.
He has published more than 130 refereed journal publications and a further 230 refereed conference publications and 5 book chapters.
Dr Proud, his students and collaborators have received prizes and awards over the years including the UK National Award for High-Speed Photography and Photonics, and the Schardin Medal for High-Speed Photography.
报告摘要：
Metals have been extensively studied under shock loading for over 50 years, explosive and plate impact techniques being used to produce transient high-pressure states. In the shock state, due to inertial confinement, the samples are in 1-D strain. Properties such as the Hugoniot Elastic Limit (HEL), the elastic limit associated with strain rate of 105 – 106 s-1, are widely reported. Similar data has been produced on the Spall (dynamic tensile) strength of materials. Recent research on single crystal magnesium will be reported, the effect of sample thickness, sample temperature and recovery will be presented and the role of mechanism of phonon interaction and energy dispersal discussed. The talk will compare these new results with those seen in polycrystalline samples and with other common metal systems (BCC and FCC) and provide an overview of the diagnostic systems used.
