New development to measure mode I. fracture toughness in rock

Mir Raouf Hadei, John M Kemeny, Abdolhadi Ghazvinian, Abolfazl Rezaiepoor, Vahab Sarfarazi

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Tensile fracture toughness is one of the dominant characteristics of rocks that play an important role in fracture mechanics of rock structures. In spite of the substantial amount of work that has been conducted as suggested methods to determine the fracture toughness of rock in Mode I., research on new methods are still demanded. The compact tension (CT) specimen is widely used to determine the fracture toughness of metals and is a standard method in accordance with ASTM standard. To conduct similar direct tests in rock, preparation of rock specimen a difficult task and needs some special tools to create notched sample. To address these issues, experimental techniques based direct tensile apparatus have been developed. Developed experimental procedure involves the use of the specimens having a central hole and two notches or cracks at both inner side of proposed specimen. The stress intensity factor formula at the crack tip of a CT specimen can be availed through the literature. However a new expression of stress intensity factor is needed for the developed test in order to account geometry and loading configuration. To develop a new stress intensity factor expression, the numerical models of suggested method were worked out. The focus of the current work is on development of the experimental technique, which involves determining the optimum sample size and shape, loading procedure, fracture toughness for different rock types, and verification of suggested method based on CT test which has been carefully considered in this investigations.

Original languageEnglish (US)
Pages (from-to)51-55
Number of pages5
JournalPeriodica Polytechnica: Civil Engineering
Volume61
Issue number1
DOIs
StatePublished - 2017

Fingerprint

fracture toughness
Fracture toughness
Rocks
Stress intensity factors
rock
crack
fracture mechanics
Fracture mechanics
Crack tips
Numerical models
method
Cracks
geometry
Geometry
metal
Metals
test

Keywords

  • CT test
  • Mode I. fracture toughness
  • Stress intensity factor

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Geotechnical Engineering and Engineering Geology

Cite this

New development to measure mode I. fracture toughness in rock. / Hadei, Mir Raouf; Kemeny, John M; Ghazvinian, Abdolhadi; Rezaiepoor, Abolfazl; Sarfarazi, Vahab.

In: Periodica Polytechnica: Civil Engineering, Vol. 61, No. 1, 2017, p. 51-55.

Research output: Contribution to journalArticle

Hadei, Mir Raouf ; Kemeny, John M ; Ghazvinian, Abdolhadi ; Rezaiepoor, Abolfazl ; Sarfarazi, Vahab. / New development to measure mode I. fracture toughness in rock. In: Periodica Polytechnica: Civil Engineering. 2017 ; Vol. 61, No. 1. pp. 51-55.
@article{b807289c23384681859ded9075284537,
title = "New development to measure mode I. fracture toughness in rock",
abstract = "Tensile fracture toughness is one of the dominant characteristics of rocks that play an important role in fracture mechanics of rock structures. In spite of the substantial amount of work that has been conducted as suggested methods to determine the fracture toughness of rock in Mode I., research on new methods are still demanded. The compact tension (CT) specimen is widely used to determine the fracture toughness of metals and is a standard method in accordance with ASTM standard. To conduct similar direct tests in rock, preparation of rock specimen a difficult task and needs some special tools to create notched sample. To address these issues, experimental techniques based direct tensile apparatus have been developed. Developed experimental procedure involves the use of the specimens having a central hole and two notches or cracks at both inner side of proposed specimen. The stress intensity factor formula at the crack tip of a CT specimen can be availed through the literature. However a new expression of stress intensity factor is needed for the developed test in order to account geometry and loading configuration. To develop a new stress intensity factor expression, the numerical models of suggested method were worked out. The focus of the current work is on development of the experimental technique, which involves determining the optimum sample size and shape, loading procedure, fracture toughness for different rock types, and verification of suggested method based on CT test which has been carefully considered in this investigations.",
keywords = "CT test, Mode I. fracture toughness, Stress intensity factor",
author = "Hadei, {Mir Raouf} and Kemeny, {John M} and Abdolhadi Ghazvinian and Abolfazl Rezaiepoor and Vahab Sarfarazi",
year = "2017",
doi = "10.3311/PPci.9264",
language = "English (US)",
volume = "61",
pages = "51--55",
journal = "Periodica Polytechnica: Civil Engineering",
issn = "0553-6626",
publisher = "Budapest University of Technology and Economics",
number = "1",

}

TY - JOUR

T1 - New development to measure mode I. fracture toughness in rock

AU - Hadei, Mir Raouf

AU - Kemeny, John M

AU - Ghazvinian, Abdolhadi

AU - Rezaiepoor, Abolfazl

AU - Sarfarazi, Vahab

PY - 2017

Y1 - 2017

N2 - Tensile fracture toughness is one of the dominant characteristics of rocks that play an important role in fracture mechanics of rock structures. In spite of the substantial amount of work that has been conducted as suggested methods to determine the fracture toughness of rock in Mode I., research on new methods are still demanded. The compact tension (CT) specimen is widely used to determine the fracture toughness of metals and is a standard method in accordance with ASTM standard. To conduct similar direct tests in rock, preparation of rock specimen a difficult task and needs some special tools to create notched sample. To address these issues, experimental techniques based direct tensile apparatus have been developed. Developed experimental procedure involves the use of the specimens having a central hole and two notches or cracks at both inner side of proposed specimen. The stress intensity factor formula at the crack tip of a CT specimen can be availed through the literature. However a new expression of stress intensity factor is needed for the developed test in order to account geometry and loading configuration. To develop a new stress intensity factor expression, the numerical models of suggested method were worked out. The focus of the current work is on development of the experimental technique, which involves determining the optimum sample size and shape, loading procedure, fracture toughness for different rock types, and verification of suggested method based on CT test which has been carefully considered in this investigations.

AB - Tensile fracture toughness is one of the dominant characteristics of rocks that play an important role in fracture mechanics of rock structures. In spite of the substantial amount of work that has been conducted as suggested methods to determine the fracture toughness of rock in Mode I., research on new methods are still demanded. The compact tension (CT) specimen is widely used to determine the fracture toughness of metals and is a standard method in accordance with ASTM standard. To conduct similar direct tests in rock, preparation of rock specimen a difficult task and needs some special tools to create notched sample. To address these issues, experimental techniques based direct tensile apparatus have been developed. Developed experimental procedure involves the use of the specimens having a central hole and two notches or cracks at both inner side of proposed specimen. The stress intensity factor formula at the crack tip of a CT specimen can be availed through the literature. However a new expression of stress intensity factor is needed for the developed test in order to account geometry and loading configuration. To develop a new stress intensity factor expression, the numerical models of suggested method were worked out. The focus of the current work is on development of the experimental technique, which involves determining the optimum sample size and shape, loading procedure, fracture toughness for different rock types, and verification of suggested method based on CT test which has been carefully considered in this investigations.

KW - CT test

KW - Mode I. fracture toughness

KW - Stress intensity factor

UR - http://www.scopus.com/inward/record.url?scp=85006269873&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85006269873&partnerID=8YFLogxK

U2 - 10.3311/PPci.9264

DO - 10.3311/PPci.9264

M3 - Article

AN - SCOPUS:85006269873

VL - 61

SP - 51

EP - 55

JO - Periodica Polytechnica: Civil Engineering

JF - Periodica Polytechnica: Civil Engineering

SN - 0553-6626

IS - 1

ER -