Research on Dynamic Strength and Inertia Effect of Concrete Materials Based on Large-Diameter Split Hopkinson Pressure Bar Test

The Split Hopkinson Pressure Bar (SHPB) test device is an important tool to study the dynamic characteristics of concrete materials. Inertial effect is one of the main factors that cause inaccurate results in SHPB tests of concrete materials. To solve this problem, Large-diameter SHPB tests on concrete and mortar were performed. A dynamic increase factor (DIF) model considering strain rate effect and inertia effect was established. This model provides a scientific reference for studying the dynamic mechanical properties of concrete materials. The experimental results indicate that the strain rate effect of concrete is more sensitive than that of mortar, but the inertia effect of mortar is more sensitive than that of concrete. Under the same strain rate, the energy utilization rate, average fragment size, and impact potentiality of mortar are higher than concrete.

Automated summary

The Split Hopkinson Pressure Bar (SHPB) test device is an important tool for studying the dynamic characteristics of concrete materials. Inertial effect can lead to inaccurate results in SHPB tests, so large-diameter SHPB tests were conducted and a dynamic increase factor (DIF) model considering strain rate effect and inertia effect was established. The experimental results indicate that the strain rate effect is more sensitive in concrete than in mortar, while the inertia effect is more sensitive in mortar than in concrete.