講演情報
[2403]Experimental and Numerical Investigation of Dynamic Tensile Fracture Behavior of Rock in Spalling Tests
○Gyeongjo MIN1 (1. Hokkaido University)
司会：
キーワード：
Dynamic tensile fracture、Spalling test、High strain-rate、Numerical simulation
Dynamic tensile fracturing plays a critical role in rock fragmentation and the stability assessment of rock structures subjected to blasting, impact, and other high-rate loading conditions. The spalling test using a Hopkinson bar system has been widely employed to investigate the dynamic tensile behavior of rocks under high strain-rate conditions. However, the dynamic fracture process associated with stress-wave propagation, fracture initiation, and strain localization remains insufficiently understood.
In this study, experimental and numerical investigations were conducted to investigate the dynamic tensile fracture behavior of rock in spalling tests. Experimental observations were performed to examine stress-wave propagation, fracture initiation, and the evolution of tensile fractures during spalling, while numerical simulations were used to provide further insight into the fracture process. Comparisons between the experimental and numerical results were carried out to improve the understanding of dynamic tensile fracturing under high strain-rate loading conditions.
The results successfully captured the propagation and reflection of stress waves within the specimen and enabled direct observation of tensile strain localization preceding fracture initiation. The temporal evolution of the deformation field provided valuable insight into the location and sequence of fracture development. Furthermore, good agreement was obtained between the experimentally observed responses and numerical predictions in terms of fracture behavior and dynamic response.
The combined use of experimental observations and numerical simulations provides an effective framework for investigating dynamic tensile fracture behavior in rock spalling tests. The findings contribute to a better understanding of the mechanisms governing dynamic tensile fracturing and strain-rate effects under high-rate loading conditions.
In this study, experimental and numerical investigations were conducted to investigate the dynamic tensile fracture behavior of rock in spalling tests. Experimental observations were performed to examine stress-wave propagation, fracture initiation, and the evolution of tensile fractures during spalling, while numerical simulations were used to provide further insight into the fracture process. Comparisons between the experimental and numerical results were carried out to improve the understanding of dynamic tensile fracturing under high strain-rate loading conditions.
The results successfully captured the propagation and reflection of stress waves within the specimen and enabled direct observation of tensile strain localization preceding fracture initiation. The temporal evolution of the deformation field provided valuable insight into the location and sequence of fracture development. Furthermore, good agreement was obtained between the experimentally observed responses and numerical predictions in terms of fracture behavior and dynamic response.
The combined use of experimental observations and numerical simulations provides an effective framework for investigating dynamic tensile fracture behavior in rock spalling tests. The findings contribute to a better understanding of the mechanisms governing dynamic tensile fracturing and strain-rate effects under high-rate loading conditions.