A new Method for Measuring Mode-I Dynamic Fracture Toughness of Rock under Blasting Loads

被引：22

作者：

Zhu, Z. M. ^{[1
]}

Xu, W. T. ^{[1
]}

Feng, R. Q. ^{[1
]}

机构：

[1] Sichuan Univ, Coll Architecture & Environm, Chengdu 610065, Sichuan, Peoples R China

来源：

EXPERIMENTAL TECHNIQUES | 2016年 / 40卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Mode-I Crack; Dynamic Fracture; Fracture Toughness; Blasting Load; Testing Method; PARAMETERS; PROPAGATION; DAMAGE;

D O I：

10.1007/s40799-016-0093-x

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Blasting excavation method by using explosive is still widely applied in mining and quarrying, and therefore, rock dynamic fracture toughness under blasting loads is one of the most concerned subjects in rock dynamics. In this paper, blasting experiments by using detonators and cement mortar specimens with a mode-I crack were conducted. The crack initiation time was determined by the strain signal recorded by a signal conditioner. The pressure acting on the hole was obtained by the strains measured from the two strain gauges near the hole, and then the pressure was applied as the dynamic boundary condition of the hole in the subsequent numerical calculation by using ANSYS code. The crack tip open displacements were calculated and applied in the determination of crack tip dynamic intensity factors KI, and accordingly the curve of KI versus time was obtained. The dynamic toughness was determined according to the time of crack initiation.

引用

页码：899 / 905

页数：7

共 26 条

[1] Geometry effects and statistical analysis of mode I fracture in guiting limestone [J].

Aliha, M. R. M. ;

Sistaninia, M. ;

Smith, D. J. ;

Pavier, M. J. ;

Ayatollahi, M. R. .

INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES, 2012, 51 :128-135

[2]

[Anonymous], 2007, The complete ISRM Suggested Mehtods for Rock Characterization, Testing, and Monitoring: 1974-2006, DOI DOI 10.1007/978-3-319-07713-0

[3] Wide range data for crack tip parameters in two disc-type specimens under mixed mode loading [J].

Ayatollahi, M. R. ;

Aliha, M. R. M. .

COMPUTATIONAL MATERIALS SCIENCE, 2007, 38 (04) :660-670

[4] Laboratory measurements of the rate dependence of the fracture toughness anisotropy of Barre granite [J].

Dai, F. ;

Xia, K. W. .

INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES, 2013, 60 :57-65

[5] Determination of dynamic rock Mode-I fracture parameters using cracked chevron notched semi-circular bend specimen [J].

Dai, F. ;

Xia, K. ;

Zheng, H. ;

Wang, Y. X. .

ENGINEERING FRACTURE MECHANICS, 2011, 78 (15) :2633-2644

[6] Experimental investigation of dynamic effects in a two-bar/three-point bend fracture test [J].

Jiang, Fengchun ;

Vecchio, Kenneth S. .

REVIEW OF SCIENTIFIC INSTRUMENTS, 2007, 78 (06)

[7] Strain rate effects on dynamic fracture and strength [J].

Lambert, DE ;

Ross, CA .

INTERNATIONAL JOURNAL OF IMPACT ENGINEERING, 2000, 24 (10) :985-998

[8] Numerical simulation of blasting-induced rock fractures [J].

Ma, G. W. ;

An, X. M. .

INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES, 2008, 45 (06) :966-975

[9]

Molenaar AAA, 2002, JOURNAL OF THE ASSOCIATION OF ASPHALT PAVING TECHNOLOGISTS, VOL 71, P794

[10] DYNAMIC FRACTURE INITIATION IN BRITTLE MATERIALS UNDER COMBINED MODE I/II LOADING [J].

NAKANO, M ;

KISHIDA, K ;

YAMAUCHI, Y ;

SOGABE, Y .

JOURNAL DE PHYSIQUE IV, 1994, 4 (C8) :695-700

← 1 2 3 →