Journal Published Online: 19 July 2021
Volume 50, Issue 1

Experimental Study on Dynamic Mechanical Properties and Fracturing Behavior of Granite CSTFBD Specimens in SHPB Tests

CODEN: JTEVAB

Abstract

The purpose of this paper is to study the dynamic fracture mechanics characteristics and fracturing behavior of cracked-straight-through flattened Brazilian disk specimens using the Split Hopkinson Pressure bar system. The researchers also used Particle Flow Code 2D for simulating the crack process and achieved consistent outcomes. In this experiment, rock specimens were made from Beijing Fangshan granite. The results of the experiment determined the effects of impact pressures and loading angles on the crack mode and mechanical properties of the specimens. These specimens have attained the stress equilibrium state prior to failure. With greater impact pressure, there will be faster changes in the corresponding equivalent tensile stress, while the peak value remains relatively high under the same loading angle. With different loading angles, the change rate of the equivalent tensile stress remains the same; however, the time required to reach the maximum stress becomes different. For a 30° loading angle, the energy dissipation ratio in accordance with the same impact pressure is lower than compared to that of a 0° loading angle. In this experiment, several cracks have been produced under a different range of impact pressures and loading angles, which can be classified into six types. They include two types of tensile cracks, shear cracks, and tensile-shear cracks. At a 0° loading angle, mode I fracture occurs, and at 15° and 30° loading angles, a mixed-mode I-II fracture occurs on the specimen. Furthermore, triangular fracture zones occur on the two end faces of the specimens under the loading force due to the concentration of local stress during the force process.

Author Information

Peng, Linzhi
School of Mechanics & Civil Engineering, China University of Mining and Technology (Beijing), Haidian District, Beijing, China
Yue, Zhongwen
School of Mechanics & Civil Engineering, China University of Mining and Technology (Beijing), Haidian District, Beijing, China
Wang, Xu
School of Mechanics & Civil Engineering, China University of Mining and Technology (Beijing), Haidian District, Beijing, China
Zhou, Jun
School of Mechanics & Civil Engineering, China University of Mining and Technology (Beijing), Haidian District, Beijing, China
Yue, Xiaolei
School of Mechanics & Civil Engineering, China University of Mining and Technology (Beijing), Haidian District, Beijing, China
Xu, Shengnan
School of Mechanics & Civil Engineering, China University of Mining and Technology (Beijing), Haidian District, Beijing, China
Qiu, Peng
School of Mechanics & Civil Engineering, China University of Mining and Technology (Beijing), Haidian District, Beijing, China State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Haidian District, Beijing, China
Pages: 22
Price: $25.00
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Details
Stock #: JTE20210116
ISSN: 0090-3973
DOI: 10.1520/JTE20210116