The effect of heating rate on the fracture behavior of cracked straight-through Brazilian disc specimen

XIAO Xiaodong; ZHOU Lei; LIANG Xian; LIANG Wangqian; LI Yao; WANG Haohan

doi:10.19606/j.cnki.jmst.2024.04.010

矿业科学学报 (Aug 2024)

The effect of heating rate on the fracture behavior of cracked straight-through Brazilian disc specimen

XIAO Xiaodong,
ZHOU Lei,
LIANG Xian,
LIANG Wangqian,
LI Yao,
WANG Haohan

Affiliations

XIAO Xiaodong: State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, College of Architecture and Environment, Sichuan University, Chengdu, 610065, China
ZHOU Lei: State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, College of Architecture and Environment, Sichuan University, Chengdu, 610065, China
LIANG Xian: State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, College of Architecture and Environment, Sichuan University, Chengdu, 610065, China
LIANG Wangqian: State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, College of Architecture and Environment, Sichuan University, Chengdu, 610065, China
LI Yao: State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, College of Architecture and Environment, Sichuan University, Chengdu, 610065, China
WANG Haohan: State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, College of Architecture and Environment, Sichuan University, Chengdu, 610065, China

DOI: https://doi.org/10.19606/j.cnki.jmst.2024.04.010
Journal volume & issue: Vol. 9, no. 4
pp. 586 – 596

Abstract

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This study investigates the fracture characteristics and damage mechanism of granite after treatment under different heating rates. The cracked straight-through Brazilian disc(CSTBD)specimen was used for high-temperature treatment with four heating rates under four sets of heating temperatures. The Brazilian splitting experiments were carried out using electro-hydraulic servo press after cooling down to room temperature, and the static fracture process was analyzed to investigate the effect of heating rate on the fracture mechanical properties of specimens. The results show that: (1) Granite treated at different high temperatures shifted from brittle to ductile damage. (2)The peak damage load of granite treated with different heating rates at the same temperature decreased with the increase of heating rate. At the same temperature, the increase of heating rate doesn't lead to obvious difference in the apparent color of granite, but with gradual increase of apparent cracks. (3)At different heating rates, the longitudinal wave velocity and elastic modulus at 200 ℃ and 400 ℃ show subtle changes, yet at 600 ℃ and above, the longitudinal wave velocity and elastic modulus decrease significantly with the increase of heating rate. (4) The fracture toughness of granite shows gradual decay with the increase of temperature. At the same temperature, type I fracture toughness of granite specimens decreases with the increase of heating rate. At 400 ℃, heating rate exerts maximum influence on the fracture toughness of granite.

Published in 矿业科学学报

ISSN: 2096-2193 (Print)
Publisher: Emergency Management Press
Country of publisher: China
LCC subjects: Technology: Engineering (General). Civil engineering (General): Engineering geology. Rock mechanics. Soil mechanics. Underground construction; Technology: Mining engineering. Metallurgy
Website: http://kykxxb.cumtb.edu.cn/indexen.htm

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