Stress intensity factors and fracture process zones of ISRM-suggested chevron notched specimens for mode I fracture toughness testing of rocks

被引：111

作者：

Wei, Ming-Dong ^{[1
]}

Dai, Feng ^{[1
]}

Xu, Nu-Wen ^{[1
]}

Zhao, Tao ^{[1
]}

机构：

[1] Sichuan Univ, Coll Water Resource & Hydropower, State Key Lab Hydraul & Mt River Engn, Chengdu 610065, Sichuan, Peoples R China

来源：

ENGINEERING FRACTURE MECHANICS | 2016年 / 168卷

基金：

中国国家自然科学基金;

关键词：

Fracture toughness; Stress intensity factor; Fracture process zone; Chevron notched specimen; Finite element analysis; CCNBD SPECIMENS; GRANITIC-ROCKS; BRITTLE ROCKS; PARAMETERS; CONCRETE; RESISTANCE; ANISOTROPY; MECHANISM; LIMESTONE; STRENGTH;

D O I：

10.1016/j.engfracmech.2016.10.004

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

The International Society for Rock Mechanics has suggested three chevron notched specimens (CB, SR and CCNBD) to measure mode I fracture toughness of rocks; however, the measured results are not comparable. In this study, the dimensionless stress intensity factors for the three ISRM-suggested specimens are calibrated and demonstrated to be either overestimated, reliable or underestimated. For the first time, the lengths of fracture process zones (FPZs) in these specimens are estimated and revealed to be partly responsible for the measuring discrepancy among these methods. Some controversies about the fracture toughness measurement using the CCNBD specimen are clarified. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：174 / 189

页数：16

共 54 条

[1] Determination of mode III fracture toughness for different materials using a new designed test configuration [J].