摘要
为分析TiB2-B4C复合陶瓷的静动态力学性能及添加剂TiB2的影响机制,设计了静动态压缩实验和平板撞击实验,开展了复合陶瓷在不同应变率下的动态压缩特性研究。结果表明:一维应力波加载下TiB2-B4C复合材料具有陶瓷材料的脆性特征,应力-应变曲线呈典型的线性关系;由一维应变加载下试样的自由面速度历程可知,复合材料的Hugoniot弹性极限在14.98~16.91 GPa之间,且随着应变率的增加而增加;应变率低于103s-1时,TiB2-B4C复合材料的动态压缩强度高于单相B4C和单相TiB2陶瓷,且具有正相关的应变率敏感性,复合材料强度的提升得益于微观结构的改善,而应变率敏感性主要受添加剂TiB2的强化增韧媒介影响;然而,应变率高于104s-1时,TiB2-B4C复合材料的Hugoniot弹性极限接近基体B4C陶瓷,而受添加剂TiB2的影响较小。
In order to study the dynamic mechanical properties of TiB2-B4C composite and the effect of additive TiB2 on the mechanical properties,a series of static/dynamic compression experiments and plate impact experiments were designed to evaluate the dynamic compression property of the composite at different strain rates.Experimental results show that the TiB2-B4C composite is a brittle material as ceramic.The stress-strain relations of the composite show a typical linear characteristic.The Hugoniot elastic limit of the composite is increased from 14.98 to 16.91 GPa with the increass in loading strain rate.When the loading rate is lower than 103s-1,the dynamic compression strength of TiB2-B4C composite is higher than those of the pure B4C and pure TiB2ceramic,and it has a positive strain rate sensitivity under onedimensional stress wave loading.The increase in compression strength of the composite benefits from the improvement of the microstructure.The strain rate sensitivity is mainly controlled by the additive TiB2which serves as a strengthening and toughening agent.However,when the loading rate is higher than104s-1,the Hugoniot elastic limit of TiB2-B4C composite is close to that of the matrix B4C,and is little affected by the additive TiB2.
作者
高玉波
秦国华
张伟
宜晨虹
邓勇军
GAO Yubo;QIN Guohua;ZHANG Wei;YI Chenhong;DENG Yongjun(School of Science,North University of China,Taiyuan 030051,Shanxi,China;School of Astronautics,Harbin Institute of Technology,Harbin 150080,Heilongjiang,China;Laboratory for Shock Wave and Detonation Physics Research,Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621900,Sichuan,China;Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China)
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2019年第11期2304-2310,共7页
Acta Armamentarii
基金
国家自然科学基金项目(11702257)
山西省自然科学基金项目(201801D221036)
中国空气动力研究与发展中心超高速碰撞研究中心开放基金项目(20190101)
