摘要
采用颗粒离散元方法,建立分离式霍普金森压杆的数值计算模型,研究了陶瓷巴西圆盘的动态劈裂破坏。仿真结果表明:离散元模拟获得的反射波形存在一个明显的转折点并紧随一个急速上升的信号,实验获得的波形也有类似的变化特征;陶瓷圆盘动态破坏是试件与弹性杆接触处最先产生裂纹,裂纹聚集形成局部损伤区域,并沿轴线向中心扩展而导致试件劈裂破坏,是一个动态过程;圆盘试件的破坏形貌与实验结果基本一致。仿真结果对开展陶瓷巴西圆盘动态劈裂试验具有指导意义。
A numerical model of split Hopkinson compression bar was established by using the particle discrete element method to study the dynamic splitting failure of Brazilian ceramic disk.The results show that there is an obvious turning point on the reflection waveform obtained by the DEM Simulation and it is followed by a signal of rapid rise,and the waveform obtained by the experiment also has similar characteristics of change;the dynamic failure of the ceramic disk is that the first crack occurs at the contact between the specimen and the elastic rod,and then the cracks gather to form a local damage area.The dynamic process of splitting failure is caused by the expansion along the axis to the center,and the failure morphology of the disk specimen is basically consistent with the experimental results.The simulation results have guiding significance for the dynamic splitting test of Brazilian ceramic disk.
作者
赵翰卿
任会兰
ZHAO Hanqing;REN Huilan(State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China)
出处
《兵器装备工程学报》
CAS
CSCD
北大核心
2021年第3期119-124,共6页
Journal of Ordnance Equipment Engineering
基金
国家自然科学基金项目(11872124)。
关键词
陶瓷
巴西圆盘
裂纹扩展
离散元
动态拉伸强度
ceramic
Brazilian disc
crack propagation
discrete element
dynamic tensile strength
