摘要
浇铸类炸药由于质地软、波阻抗及波速都很低,通过传统SHPB实验方法无法得到准确的应力应变数据。透射杆信号幅值过低、试样应力平衡均匀性不高以及大应变加载引起的入射波反射波重叠失效,是进行浇铸类炸药SHPB实验的难点所在。本文中对传统SHPB实验方法进行改进,在试样两端面加装石英晶体应力计,引入石英计所获得的应力数据与应变片测得数据共同对试样应力应变状态进行计算。该方法可以提高透射信号幅值,提供试样大应变加载,避免了入射波反射波重叠导致的信号失效问题,修正了SHPB实验过程中的应力时空不均匀性的影响,提高了实验结果的可靠性。利用改进后的实验方法对典型浇铸类炸药进行了实验研究,得到了较准确的应力应变曲线。
It is generally impossible to obtain valid constitutive data of casting explosive by conventional SHPB tests, due to its low impedance and soft texture and to its inability to attain uniformity required. A modified SHPB method is therefore proposed to get reliable dynamic response data of casting explosive. The piezoelectricity quartz gauges have been used to directly measure dynamic stress processing of specimen. This modified data processing method has been adopted, which can eliminate the effect caused by stress non-uniformity. By using the modified data processing, the signal failure problem caused by long pulse incident can also be resolved. With the modified SHPB method, satisfactory results have been obtained in processing casting explosive.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2015年第6期846-851,共6页
Explosion and Shock Waves
关键词
爆炸力学
应力不均匀
SHPB实验
浇铸类炸药
低阻抗材料
mechanics of explosion
stress non-uniformness
SHPB tests
casting explosive
low impedance material
