爆炸应力波在含层理介质中传播规律的实验研究

摘要

采用超高速数字图像相关实验系统,进行了爆炸应力波在含层理结构的PMMA试件中的传播试验,分析了全场应变的演化过程和相关测点的应变时程变化.实验结果表明:爆炸应力波在含有层理的介质中传播时,层理远区的应力波衰减幅度比层理近区的应力波衰减幅度大.通过应变云图的演化过程发现,应力波遇到层理后会发生反射,入射拉伸波与反射拉伸波叠加形成了较强的拉伸集中区,并沿着层理向两端扩展逐步减弱.此外,通过数据拟合得到了层理内、外侧的应变峰值衰减规律,应变峰值的衰减随距离基本是线性的,且层理内侧的应变衰减速度大于层理外侧的.%The ultra-high-speed digital image correlation experiment system was used to carry out the experiment of explosive stress wave propagation in PMMA specimen with bedding structure,and the evolution process of the strain as well as the change of the strain time of the relevant measuring points was analyzed.Experimental results showed that when the stress wave propagating in the medium containing the bedding,the attenuation of stress wave in the far area of bedding was larger than that in the near area of bedding.Through the evolution of strain cloud,it is found that the stress wave is reflected after encountering the bedding,and the incident tensile wave and the reflected tensile wave superimpose to form strong tensile concentrated region which extended and weakened along the bedding to both ends.In addition,the attenuation of the strain peak regular is obtained by data fitting,and the attenuation of the strain peak is linear with the distance,and the strain attenuation velocity inside the bedding is larger than that outside of the bedding.