Characterization of damage mechanisms in cortical bone : Quantification of fracture resistance, critical strains, and crack tortuosity
Gustafsson, Anna LU
; Galteri, Giulia
LU
; Barakat, Arthur
LU
; Engqvist, Jonas
LU
; Grassi, Lorenzo
LU
; Cristofolini, Luca
; Dejea, Hector
LU
and Isaksson, Hanna
LU
(2024)
In Journal of the Mechanical Behavior of Biomedical Materials
160.
- Abstract
One step towards understanding bone fragility and degenerative diseases is to unravel the links between fracture resistance and the compositional and structural characteristics of cortical bone. In this study, we explore an optical method for automatic crack detection to generate full fracture resistance curves of cortical bone. We quantify fracture toughness, critical failure strains at the crack tip, and crack tortuosity in three directions and analyze how they relate to cortical bone microstructure. A three-point bending fracture test of single-edge notched beam specimens in three directions (cracks propagating transverse, radial and longitudinal to the microstructure) from bovine cortical bone was combined with 2D-digital image... (More)
One step towards understanding bone fragility and degenerative diseases is to unravel the links between fracture resistance and the compositional and structural characteristics of cortical bone. In this study, we explore an optical method for automatic crack detection to generate full fracture resistance curves of cortical bone. We quantify fracture toughness, critical failure strains at the crack tip, and crack tortuosity in three directions and analyze how they relate to cortical bone microstructure. A three-point bending fracture test of single-edge notched beam specimens in three directions (cracks propagating transverse, radial and longitudinal to the microstructure) from bovine cortical bone was combined with 2D-digital image correlation. Crack growth was automatically monitored by analyzing discontinuities in the displacement field using phase congruency analysis. Fracture resistance was analyzed using J-R-curves and strains were quantified at the crack tip. Post-testing, a subset of specimens was scanned using micro-tomography to visualize cracks and to quantify their tortuosity. Both fracture toughness and crack tortuosity were significantly higher in the transverse direction compared to the other directions. Similar fracture toughness was found for radial and longitudinal directions, albeit 20% higher crack tortuosity in the radial specimens. This suggests that radial crack deflections are not as efficient toughening mechanisms. Strains at crack initiation were ∼0.4% for all tissue orientations, while at fully developed damage process zones failure strains were significantly higher in the transverse direction (∼1.5%). Altogether, we present unique quantitative data including different aspects of bone damage in three directions, illustrating the importance of cortical bone microstructure.
(Less)
- author
- Gustafsson, Anna
LU
; Galteri, Giulia
LU
; Barakat, Arthur
LU
; Engqvist, Jonas
LU
; Grassi, Lorenzo
LU
; Cristofolini, Luca
; Dejea, Hector
LU
and Isaksson, Hanna
LU
- organization
- publishing date
- 2024-12
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of the Mechanical Behavior of Biomedical Materials
- volume
- 160
- article number
- 106721
- publisher
- Elsevier
- external identifiers
-
- scopus:85203791565
- pmid:39288666
- ISSN
- 1751-6161
- DOI
- 10.1016/j.jmbbm.2024.106721
- project
- Fracture mechanics of bone tissue – impact of age and disease
- language
- English
- LU publication?
- yes
- additional info
- Copyright © 2024 The Author(s). Published by Elsevier Ltd.. All rights reserved.
- id
- 5316d752-b768-4256-8f35-43d4046efbaa
- date added to LUP
- 2024-09-23 12:57:54
- date last changed
- 2025-07-30 22:32:22
@article{5316d752-b768-4256-8f35-43d4046efbaa,
abstract = {{<p>One step towards understanding bone fragility and degenerative diseases is to unravel the links between fracture resistance and the compositional and structural characteristics of cortical bone. In this study, we explore an optical method for automatic crack detection to generate full fracture resistance curves of cortical bone. We quantify fracture toughness, critical failure strains at the crack tip, and crack tortuosity in three directions and analyze how they relate to cortical bone microstructure. A three-point bending fracture test of single-edge notched beam specimens in three directions (cracks propagating transverse, radial and longitudinal to the microstructure) from bovine cortical bone was combined with 2D-digital image correlation. Crack growth was automatically monitored by analyzing discontinuities in the displacement field using phase congruency analysis. Fracture resistance was analyzed using J-R-curves and strains were quantified at the crack tip. Post-testing, a subset of specimens was scanned using micro-tomography to visualize cracks and to quantify their tortuosity. Both fracture toughness and crack tortuosity were significantly higher in the transverse direction compared to the other directions. Similar fracture toughness was found for radial and longitudinal directions, albeit 20% higher crack tortuosity in the radial specimens. This suggests that radial crack deflections are not as efficient toughening mechanisms. Strains at crack initiation were ∼0.4% for all tissue orientations, while at fully developed damage process zones failure strains were significantly higher in the transverse direction (∼1.5%). Altogether, we present unique quantitative data including different aspects of bone damage in three directions, illustrating the importance of cortical bone microstructure.</p>}},
author = {{Gustafsson, Anna and Galteri, Giulia and Barakat, Arthur and Engqvist, Jonas and Grassi, Lorenzo and Cristofolini, Luca and Dejea, Hector and Isaksson, Hanna}},
issn = {{1751-6161}},
language = {{eng}},
publisher = {{Elsevier}},
series = {{Journal of the Mechanical Behavior of Biomedical Materials}},
title = {{Characterization of damage mechanisms in cortical bone : Quantification of fracture resistance, critical strains, and crack tortuosity}},
url = {{http://dx.doi.org/10.1016/j.jmbbm.2024.106721}},
doi = {{10.1016/j.jmbbm.2024.106721}},
volume = {{160}},
year = {{2024}},
}