您目前所在的位置:首页 - 期刊简介 - 详细页面

铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 4    August 2001

[PDF Download]    [Flash Online]

    

Mode Ⅱ fracture mechanism of direct shearing specimen
with guiding grooves of rock
RAO Qiu-hua(饶秋华)1, SUN Zong-qi(孙宗颀)1,
WANG Gui-yao(王桂尧)2, XU Ji-cheng(徐纪成)3, ZHANG Jing-yi(张静宜)3

1. College of Resources, Environment and Civil Engineering,
Central South University, Changsha 410083, P.R.China;
2. Department of River and Sea, Changsha Communications University,
Changsha 410076, P.R.China;
3. Open Lab of Mechanics, Central South University,
Changsha 410083, P.R.China

Abstract:Fracture mechanism of direct shear specimen with guiding grooves of rock was investigated experimentally and numerically in order to explore a favorable stress condition for creating Mode Ⅱ fracture and guide design of specimen configuration for determining Mode Ⅱ fracture toughness of rock,KC . The experimental and numerical results demonstrate that Mode Ⅱ fracture can be successfully achieved in the direct shearing specimen with guiding groove because the guiding grooves added , in the notch plane can generate a favorable stress condition for Mode Ⅱ fracture, i.e. tensile stress at the notch tip is completely depressed and shear stress at the notch tip is very high in the notch plane. The optimum design of the specimen configuration for KC testing should aim to reduce tensile stress to be compressive stress or be lower than tensile strength and greatly increase shear stress at crack tip.

 

Key words: Mode Ⅱ fracture; fracture mechanism; rock; direct shearing test; guiding groove

ISSN 1672-7029
CN 43-1423/U

主管:中华人民共和国教育部 主办:中南大学 中国铁道学会 承办:中南大学
湘ICP备09001153号 版权所有:《铁道科学与工程学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市韶山南路22号 邮编:410075
电 话:0731-82655133,82656174   传真:0731-82655133   电子邮箱:jrse@mail.csu.edu.cn