波分离技术在混凝土冲击压缩试验中的应用  

Wave Separation Technique Applied to Impact Compressive Experiment of Concrete

作　　者：巫绪涛[1] 胡时胜[2] 薛志刚[2] 杨伯源[1] 

机构地区：[1]合肥工业大学,合肥230009 [2]中国科学技术大学,合肥230026

出　　处：《应用力学学报》2007年第3期464-467,共4页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(10372097)

摘　　要：介绍了SHPB实验中的波分离技术基本原理,该方法利用两相距很近应变计测量信号分离重叠的入射波和反射波。由于两应变计的距离很近,在弹性杆可以忽略应力波传播的弥散。由于应变计的位置可以非常接近试样,减少了实验中因应力波弥散产生的误差。利用该方法对混凝土进行了冲击压缩实验研究,得到了混凝土的动态应力-应变关系。讨论了测量误差导致波分离技术的误差。The application of wave separation technique in the Split Hopkinson pressure bar(SHPB) test is introduced,where the overlapping incident wave and reflection wave propagate along the opposite directions according to the measured strains at two different points of a pressured bar,thus the wave dispersion can be ignored due to the short interval between the two strain gauges.The errors coming from the wave dispersion can be reduced by keeping the strain gauge near to the specimen.The impact compressive experiment for concrete is conducted to obtain the dynamic stress-strain relations.The wave separation technique error from the measurement is dealt with finally.

关 键 词：波分离技术 SHPB实验 脆性材料 动态应力-应变关系 

分 类 号：O347.4[理学—固体力学]