Experimental study on the interaction between oblique incident blast stress wave and static crack by dynamic photoelasticity

In this paper, the interaction between the oblique incident blast stress wave and the prefabricated crack is studied using the dynamic photoelastic method and numerical simulation method. First, blast loading dynamic photoelastic experiment system is established. Second, blast stress wave and crack interaction experiments are carried out. Epoxy resin plate is used as specimen material, while lead azide explosive is used to apply blasting load. In the experiment, the evolution of stress field at crack wall and crack tip are observed by a high-speed camera. The experimental results show that incident angle of blast stress wave has a great influence on the way the stress wave interacts with the crack and the field at the crack tip. Finally, based on the experimental results, two numerical models are conducted using FEM software. The numerical results of stress field are in good agreement with photoelastic experiment, which verifies the experimental analysis.

Automated summary

This paper investigates the interaction between oblique incident blast stress wave and prefabricated crack using dynamic photoelastic method and numerical simulation method. Experimental results show that the incident angle of blast stress wave significantly influences the interaction with the crack and stress field at the crack tip. Numerical models based on experimental results demonstrate good agreement with photoelastic experiments, validating the analysis.