Experimental Study on the Effect of Offset Notch on Fracture Properties of Rock under Three-Point Bending Beam

被引：6

作者：

Guo, Qifeng ^{[1
,2
]}

Wu, Xinghui ^{[1
,2
]}

Cai, Meifeng ^{[1
,2
]}

Miao, Shengjun ^{[1
,2
]}

机构：

[1] Univ Sci & Technol Beijing, Sch Civil & Resource Engn, Beijing 100083, Peoples R China

[2] Univ Sci & Technol Beijing, Sch Civil & Resource Engn, Beijing Key Lab Urban Underground Space Engn, Beijing 100083, Peoples R China

来源：

ADVANCES IN MATERIALS SCIENCE AND ENGINEERING | 2020年 / 2020卷

基金：

国家重点研发计划;

关键词：

ROUND-ROBIN ANALYSIS; TENSILE-STRENGTH; CONCRETE; TOUGHNESS; CORROSION; CRACK; MODEL;

D O I：

10.1155/2020/2781928

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

To investigate the effects of offset notch on the fracture properties of rock beam under bending load, granite beam specimens with "one single offset notch" and "central and offset double notches" are made. A series of three-point bending beam tests on the specimens are carried out by controlling the displacement rate of central notch. The whole load-displacement (P-CMOD) curves are obtained. Experimental results show that the larger the distance between the offset notch and beam central is, the larger are the peak load and nominal strength of the specimen. The peak load and nominal strength for the "central and offset double notches" specimens are both larger than those for the "single central notch" specimen. A fracture model considering the effect of offset notch is developed, and the relationship between the offset notch parameter, tensile strength, and fracture toughness is established.

引用

页数：7

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