A Cellular Solid Criterion for Predicting The Axial-Shear Failure Properties of Bovine Trabecular Bone  

Oleh:

Keaveny, T. M. ; Fenech, C. M.

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Biomechanical Engineering vol. 121 no. 4 (1999), page 414-422.
Topik: CELLULAR; cellular; solid criterion; predicting; axial - shear failure; bovine trabecular bone

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ52.1 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

In a long - term effort to develop a complete multi - axial failure criterion for human trabecular bone, the overall goal of this study was to compare the ability of a simple cellular solid mechanistic criterion versus the Tsai – Wu, Principal Strain, and von Mises phenomenological criteria - all normalized to minimize effects of interspecimen heterogeneity of strength - to predict the on - axis axial -shear failure properties of bovine trabecular bone. The Cellular Solid criterion that was developed here assumed that vertical trabeculae failed due to a linear superposition of axial compression / tension and bending stresses, induced by the apparent level axial and shear loading, respectively. Twenty - seven bovine tibial trabecular bone specimens were destructively tested on - axis without end artifacts, loaded either in combined tension - torsion (n = 10), compression - torsion (n = 11), or uniaxially (n = 6). For compression - shear, the mean (± S.D.) percentage errors between measured values and criterion predictions were 7.7 ± 12.6 percent, 19.7 ± 23.2 percent, 22.8 ± 18.9 percent, and 82.4 ± 64.5 percent for the Cellular Solid, Tsai – Wu, Principal Strain, and von Mises criteria, respectively ; corresponding mean errors for tension - shear were – 5.2 ± 11.8 percent, 14.3 ± 12.5 percent, 6.9 ± 7.6 percent, and 57.7 ± 46.3 percent. Statistical analysis indicated that the Cellular Solid criterion was the best performer for compression - shear, and performed as well as the Principal Strain criterion for tension - shear. These data should substantially improve the ability to predict axial - shear failure of dense trabecular bone. More importantly, the results firmly establish the importance of cellular solid analysis for understanding and predicting the multiaxial failure behaviour of trabecular bone.

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