Microcracking in tensile fracture of a brittle rock

Xiaoran Wang; Pouyan Asem; Chen Hu; Joseph F. Labuz

doi:10.1016/j.engfracmech.2021.107789

Microcracking in tensile fracture of a brittle rock

Xiaoran Wang, Pouyan Asem, Chen Hu, Joseph F. Labuz

Research output: Contribution to journal › Article › peer-review

42 Scopus citations

Abstract

Acoustic emission (AE) and digital image correlation were used to monitor mode I fracture in center notch and smooth boundary specimens. The AE source was characterized as a microcrack and represented by the moment tensor, which was obtained by minimizing the error between displacements calculated from an elastodynamic solution and those measured, subjected to the constraint of a microcrack source. Results showed that microcracking was locally mixed-mode dominant because of oblique microcrack planes within a tortuous fracture. However, the microcrack mechanisms decomposed in the global coordinate system indicated mainly mode I opening with modes II and III ten times smaller.

Original language	English (US)
Article number	107789
Journal	Engineering Fracture Mechanics
Volume	251
DOIs	https://doi.org/10.1016/j.engfracmech.2021.107789
State	Published - Jun 15 2021
Externally published	Yes

Bibliographical note

Funding Information:
This work was partially supported by the MSES / Miles Kersten Chair and the National Natural Science Foundation of China (Grant No. 51774280 and 51934007).

Publisher Copyright:
© 2021 Elsevier Ltd

Keywords

Acoustic emission
Digital image correlation
Displacement discontinuity
Energy dissipation
Moment tensor inversion

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title = "Microcracking in tensile fracture of a brittle rock",

abstract = "Acoustic emission (AE) and digital image correlation were used to monitor mode I fracture in center notch and smooth boundary specimens. The AE source was characterized as a microcrack and represented by the moment tensor, which was obtained by minimizing the error between displacements calculated from an elastodynamic solution and those measured, subjected to the constraint of a microcrack source. Results showed that microcracking was locally mixed-mode dominant because of oblique microcrack planes within a tortuous fracture. However, the microcrack mechanisms decomposed in the global coordinate system indicated mainly mode I opening with modes II and III ten times smaller.",

keywords = "Acoustic emission, Digital image correlation, Displacement discontinuity, Energy dissipation, Moment tensor inversion",

author = "Xiaoran Wang and Pouyan Asem and Chen Hu and Labuz, {Joseph F.}",

note = "Funding Information: This work was partially supported by the MSES / Miles Kersten Chair and the National Natural Science Foundation of China (Grant No. 51774280 and 51934007). Publisher Copyright: {\textcopyright} 2021 Elsevier Ltd",

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AU - Wang, Xiaoran

AU - Asem, Pouyan

AU - Hu, Chen

AU - Labuz, Joseph F.

N1 - Funding Information: This work was partially supported by the MSES / Miles Kersten Chair and the National Natural Science Foundation of China (Grant No. 51774280 and 51934007). Publisher Copyright: © 2021 Elsevier Ltd

PY - 2021/6/15

Y1 - 2021/6/15

N2 - Acoustic emission (AE) and digital image correlation were used to monitor mode I fracture in center notch and smooth boundary specimens. The AE source was characterized as a microcrack and represented by the moment tensor, which was obtained by minimizing the error between displacements calculated from an elastodynamic solution and those measured, subjected to the constraint of a microcrack source. Results showed that microcracking was locally mixed-mode dominant because of oblique microcrack planes within a tortuous fracture. However, the microcrack mechanisms decomposed in the global coordinate system indicated mainly mode I opening with modes II and III ten times smaller.

AB - Acoustic emission (AE) and digital image correlation were used to monitor mode I fracture in center notch and smooth boundary specimens. The AE source was characterized as a microcrack and represented by the moment tensor, which was obtained by minimizing the error between displacements calculated from an elastodynamic solution and those measured, subjected to the constraint of a microcrack source. Results showed that microcracking was locally mixed-mode dominant because of oblique microcrack planes within a tortuous fracture. However, the microcrack mechanisms decomposed in the global coordinate system indicated mainly mode I opening with modes II and III ten times smaller.

KW - Acoustic emission

KW - Digital image correlation

KW - Displacement discontinuity

KW - Energy dissipation

KW - Moment tensor inversion

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Microcracking in tensile fracture of a brittle rock

Abstract

Bibliographical note

Keywords

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