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[3108-13-01] Investigation of Discrepancies in Tensile Strength and its Strain-rate Values of Rock in a Spalling Test under Various Evaluation Methods using 3D GPGPU-Accelerated Hybrid FEM/DEM
Chairperson：小林 和弥（京都大学）
Keywords:Dynamic Tensile Strength, Spalling Test, High Strain-rate Conditions, GPGPU-accelerated Hybrid FEM/DEM, Dynamic Tensile Fracture Process of Rock
The spalling test is widely applied to evaluate the dynamic tensile strength of rock under high strain-rate conditions. This test indirectly measures dynamic tensile strength by theoretically assuming the tensile stress level at the failure position of a cylindrical specimen based on 1D stress wave propagation theory. However, the theoretical estimation method for dynamic tensile strength has not been rigorously validated due to insufficient understanding of the fracture process, such as crack propagation and stress distribution in the rock specimen during the spalling test. This gap in understanding is primarily due to observational limitations in experimental setups.
To address this, a proper validation method is required, and numerical simulation offers a viable approach by reproducing the tensile fracture process of the rock specimen during the spalling test. In this study, we reproduced the dynamic spalling tensile test for rock specimens using the GPGPU-based 3D hybrid FEM/DEM that we recently developed. The simulation analyzed the dynamic tensile fracturing process under various strain-rate conditions.
Our findings include an in-depth analysis of the dynamic tensile fracturing process and a discussion on the application of various theoretical estimation methods to the 3D spalling test. The use of the GPGPU-accelerated hybrid FEM/DEM allows for a more detailed and comprehensive understanding of the fracture mechanics involved, thus providing a robust validation of the proposed theoretical estimation methods.
To address this, a proper validation method is required, and numerical simulation offers a viable approach by reproducing the tensile fracture process of the rock specimen during the spalling test. In this study, we reproduced the dynamic spalling tensile test for rock specimens using the GPGPU-based 3D hybrid FEM/DEM that we recently developed. The simulation analyzed the dynamic tensile fracturing process under various strain-rate conditions.
Our findings include an in-depth analysis of the dynamic tensile fracturing process and a discussion on the application of various theoretical estimation methods to the 3D spalling test. The use of the GPGPU-accelerated hybrid FEM/DEM allows for a more detailed and comprehensive understanding of the fracture mechanics involved, thus providing a robust validation of the proposed theoretical estimation methods.
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