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A qualitative analysis of crack propagation in articular cartilage at varying rates of tensile loading
Citation
Stok, K and Oloyede, A, A qualitative analysis of crack propagation in articular cartilage at varying rates of tensile loading, Connective Tissue Research, 44, (2) pp. 109-120. ISSN 0300-8207 (2003) [Refereed Article]
Copyright Statement
Copyright 2003 Taylor & Francis
DOI: doi:10.1080/03008200390200256
Abstract
A custom-built miniature tensile testing apparatus was used to study the propagation of cracks through the articular cartilage matrix at various loading rates and initial crack lengths. The crack propagation mechanism was observed to be significantly dissimilar to that normally seen in traditional fracture mechanics opening mode, where fracture propagates through the thickness of samples or perpendicularly to the applied load. Instead, an artificially initiated microcrack in the surface layer of an articular cartilage sample grew laterally in the direction of the applied load, stretching about the crack tip, whose initial position remained unchanged throughout the fracture process. A progressive upward pull of the bottom layer toward the surface, which resulted in necking of the specimen, was observed. Our analysis revealed that the rate of necking was the same as that of the lateral stretch of the growing crack. We hypothesize that necking is due to the response of the collagen meshwork especially in the deep zones of the matrix to the tensile load. Our samples exhibited unstable fracture growth immediately after each microcrack grew to the base of the articular surface layer, with very fast crack propagation to failure, thereby indicating that the fracture toughness of the articular cartilage matrix is significantly determined by the toughness of its articular surface.
Item Details
Item Type: | Refereed Article |
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Keywords: | articular cartilage, cartilage fracture mechanism, crack growth, fracture propagation, surface cracks, tissue matrix damage |
Research Division: | Engineering |
Research Group: | Biomedical engineering |
Research Field: | Biomechanical engineering |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in engineering |
UTAS Author: | Stok, K (Dr Kathryn Stok) |
ID Code: | 133038 |
Year Published: | 2003 |
Web of Science® Times Cited: | 18 |
Deposited By: | Menzies Institute for Medical Research |
Deposited On: | 2019-06-04 |
Last Modified: | 2019-07-29 |
Downloads: | 0 |
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