摘要
根据一维应力波传播理论,采用行波方法建立了自由式霍普金森压杆(FHPB)高过载实验中,试件应变、加速度与压杆应变、加速度之间的等效性关系的数学分析模型。通过该模型分析试件内部应变和质点加速度分布规律,并比较压杆上的加速度与试件所受过载加速度之间的关系。利用ANSYS/LS-DYNA非线性显式动力学计算软件,对撞击过程进行数值模拟,并比较2种模型下试件受力的吻合程度来验证计算模型可靠性。结果表明:所建立的数学分析模型正确;压杆上得到的加速度表现的是试件的平均过载值。
Based on the one-dimensional wave propagation theory,new mathematical models about the strain and acceleration distribution in the specimen are established by iterative method with the wave propagating from the bar-specimen interface to the free end of the specimen. The element strain and particle acceleration in the specimen are obtained and compared with the strain and acceleration in the incident bar. The good agreement between the simulated results of ANSYS / LS-DYNA and the proposed model demonstrates the validity of the mathematical model. The results show that the model is reliable to calculate the acceleration in the specimen accurately. The acceleration wave recorded by the strain gauge can be regarded as the average levels of the acceleration wave that the specimen experiences.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2014年第S2期100-105,共6页
Acta Armamentarii
关键词
爆炸力学
霍普金森压杆
行波法
加速度
explosion mechanics
Hopkinson pressure bar
traveling wave method
acceleration
