摘要
文章利用LS-DYNA软件,采用混凝土HJC动态本构模型,对Φ74mm分离式变截面霍普金森压杆主动围压实验做了数值模拟;通过在试件径向施加恒定压力的方法模拟主动围压的作用,试件单元的压力时间历程曲线显示该方法可以获得恒定、均匀的围压值,即该方法可以对SHPB主动围压实验进行合理的模拟;利用上述主动围压模拟方法对混凝土材料主动围压下的力学性能进行了研究,模拟时采用弥散较小的三角形速度波加载,并利用波形良好的入射波、透射波重构了混凝土的应力应变曲线,重构结果显示混凝土材料在围压作用下力学性能发生变化,混凝土峰值应力、峰值应力对应的应变、韧性都随围压的增大而增加,与理论结果相符。
Using HJC dynamic constitutive model of concrete,the Φ74 mm split Hopkinson pressure bar（SHPB） test with confining pressure device is simulated by LS-DYNA finite element software.The confining pressure is simulated with the method of applying constant pressure around the specimen,and the pressure-time curve of elements of the specimen shows that the method can get a constant and uniform confining pressure value,indicating that such method can simulate the confining pressure test of SHPB well.The concrete mechanics under confining pressure is researched by the method,and the triangle velocity wave with less diffusion is used to load in the simulation.The concrete stress-strain curves are reconstructed by incident wave and transmitted wave,and the results of reconstruction show that the concrete mechanics changes under the effect of confining pressure.The peak stress,strain corresponding to peak stress and toughness increase with the augmentation of confining pressure,which is similar to the theoretical results.
出处
《合肥工业大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第2期216-220,共5页
Journal of Hefei University of Technology：Natural Science
基金
中央高校基本科研业务费专项资助项目(2010B04014)
关键词
SHPB实验
主动围压
HJC动态本构模型
应力应变曲线
应变率
split Hopkinson pressure bar（SHPB） test
confining pressure
HJC dynamic constitutive model
stress-strain curve
strain rate
