Design and application of a dynamic photoelasticity-digital image correlation comprehensive experimental system for blast loads

The evolution characteristics of a stress field under blast loads are key issues in the study of dynamic rock fragmentation mechanism. This paper focuses on the rapid changes and difficulties in quantitative characterization of blast stress fields, and establishes an integrated experimental system that combines dynamic photoelasticity with digital image correlation for blast load tests. This system includes a blast load simulation device, a dynamic photoelasticity device, a digital image correlation monitoring device, and a data acquisition and analysis setup. It enables the high-precision synchronous acquisition of both structural internal stress fields and surface deformation fields under blast loads. On this basis, a method for calculating the principal stress at any point under blast loads is proposed, which is used to accurately measure and analyze the spatio-temporal distribution and deformation evolution process of the stress field under blast loads. The system was applied to quantitatively investigate the distribution characteristics of stress and deformation fields under single-hole explosive blasting. The effectiveness of this calculation method for studying the dynamic response of materials under blast loads has been validated. This comprehensive experimental system and methodology provide, to our knowledge, new experimental tools and analytical techniques for understanding the high strain rate behavior of materials. It has important research and application value for material performance evaluation, structural design, and safety protection.