CAJ | 학술논문

为提高混凝土材料的SHPB实验结果的精度和可比性,结合混凝土的实验过程,对波导杆的弥散效应、试件内应力应变均匀性和试件的径向惯性效应进行了研究。研究结果表明：一维应力波假定和均匀性假定基本满足,混凝土试件是否有足够时间使应力应变达到均匀,取决于混凝土试件的最大应变值和应变率;实验中采用脉冲整形技术和恒应变率实验技术,并选用三波公式处理实验数据,可以增大混凝土的有效承载时间,减小试件惯性效应对实验结果的影响;当应变率接近或大于104时,需要考虑试件的径向惯性效应。
위제고혼응토재료적SHPB실험결과적정도화가비성,결합혼응토적실험과정,대파도간적미산효응、시건내응력응변균균성화시건적경향관성효응진행료연구。연구결과표명：일유응력파가정화균균성가정기본만족,혼응토시건시부유족구시간사응력응변체도균균,취결우혼응토시건적최대응변치화응변솔;실험중채용맥충정형기술화항응변솔실험기술,병선용삼파공식처리실험수거,가이증대혼응토적유효승재시간,감소시건관성효응대실험결과적영향;당응변솔접근혹대우104시,수요고필시건적경향관성효응。
In order to improve the precision and comparability of SHPB testing results of concrete materials,some studies on the SHPB technique for concrete are carried out by combining with the experimental process of concrete in this paper,which include the dispersion effect of waveguide bars,the analysis of stress and strain uniformities in specimen and the radial inertial effect of specimen.The results show that experiments meet the requirements of one-dimensional stress wave assumption and stress/strain uniformity assumption.Whether there is enough time to achieve stress and strain uniformities or not depends on the maximum strain and strain rate of concrete specimen.Pulse shaping technique and constant strain rate test technique are used in the experiments,and the experiment data is processed by using the formula of three waves,which can increase the effective loading time of concrete and reduce the inertia effect of specimen on experiment results.When the strain rate is close to or more than 104,it is necessary to consider the radial inertia effect of specimen.