Determination of dynamic mode I fracture toughness of rock at ambient high temperatures using notched semi-circular bend method

被引：12
|
作者：
Wu, You [1 ]
Yin, Tu-bing [1 ]
Liu, Xi-ling [1 ]
Tan, Xiao-song [1 ]
Yang, Zheng [1 ]
LI, Qiang [1 ]
机构：
[1] Cent South Univ, Sch Resources & Safety Engn, Changsha 410083, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2022年 / 32卷 / 09期
基金：
中国国家自然科学基金;
关键词：
ambient high-temperature condition; dynamic fracture toughness; notched semi-circular bend specimen; split Hopkinson pressure bar; Fujian granite; MECHANICAL-PROPERTIES; STATISTICAL-ANALYSIS; THERMAL-TREATMENT; LOADING-RATE; PRESSURE; PARAMETERS; GRANITE; INITIATION; BEHAVIORS; SPECIMEN;
D O I：
10.1016/S1003-6326(22)66001-1
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
To investigate the influence of loading rate and high temperature on the dynamic fracture toughness of rock, dynamic fracture tests were carried out on notched semi-circular bend specimens under four temperature conditions based on the split Hopkinson pressure bar system. Experimental and analytical methods were applied to investigating the effect of temperature gradient on the stress waves. A high-speed camera was used to check the fracture characteristics of the specimens. The results demonstrate that the temperature gradient on the bars will not significantly distort the shape of the stress wave. The dynamic force balance is achieved even when the specimens are at a temperature of 400 degrees C. The dynamic fracture toughness linearly develops with the increase of loading rate within the temperature range of 25-400 degrees C, and high temperature has a strengthening effect on the dynamic fracture toughness.
引用
收藏
页码：3036 / 3050
页数：15
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