基于DIC的爆炸加载模型实验系统及其应用

Explosion Loading Model Experiment System Based on DIC and Its Application

基于数字图像相关方法(Digital Image Correlation,DIC)将超高速摄影与Vic-2D数字图像分析软件相结合,建立了一套超动态条件下的数字图像相关分析系统。应用该系统完成了三孔同时与微差起爆的模型试验,获得了清晰的全场应变与位移云图,实现了系统5μs的同步控制精度。在超高速条件下,通过与加载前同一散斑模型各点数字图像软件进行分析比对,相对于模型破坏时的最大应变,系统给出的结果误差控制在5%以内,验证了该实验系统可行性和有效性。同时基于该系统的基本原理可实现岩石类材料模型的试验,表明该系统在研究爆炸载荷作用下不同材料应变与位移的全场性问题方面具有独特优势。

The stress and strain field detection system of the model under explosive loading is an important method to analyze the explosion mechanism.Based on the digital image correlation method,an ultra-high-speed photography and Vic-2D digital image analysis software were combined to establish a set of digital image correlation analysis system under hyper-dynamic condition.The system was used to model single-,double-,and multi-hole models simultaneously,and to obtain a clear full-field strain and displacement.The accuracy of the synchronization control of the system 5μs is realized.Compared with the digital image software of the same speckle model before loading,the error of the system is less than 5%for the maximum strain of the model.The feasibility and validity of the experimental system are verified.At the same time,based on the basic principle of the system,the experiment of rock material model can be realized.It shows that the system has a unique advantage in studying the full-field problem of strain and displacement of different materials under the action of explosion load.