Inelastic Strain Accumulation in Cortical Bone During Rapid Transient Tensile Loading  

Oleh:

Davy, D. T. ; Bahniuk, E. H. ; Fondrk, M. T.

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Biomechanical Engineering vol. 121 no. 6 (1999), page 616-621.
Topik: LOADING; inelastic; accumulation; cortical bone; tensile loading

Ketersediaan

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

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Isi artikel

An experimental study examined the tensile stress - strain behaviour of cortical bone during rapid load cycles to high strain amplitudes. Machined bovine and human cortical bone samples were subjected to loading cycles at a nominal load / unload rate of ± 420 MPa/s. Loads were reversed at pre - selected strain levels such that load cycles were typically completed in 0.5 - 0.7 seconds. Axial strain behavior demonstrated considerable non linearity in the first load cycle, while transverse strain behaviour was essentially linear. For the human bone 29.1 percent (S. D. = 4.7 percent), and for the bovine bone 35.1 percent (S. D. = 10.8 percent) of the maximum nonlinear strain accumulated after load reversal, where non linear strain was defined as the difference between total strain and strain corresponding to linear elastic behaviour. Average residual axial strain on unloading was 35.4 percent (S. D. = 1.2 percent) for human bone and 35.1 percent (S. D. = 2.9 percent) of maximum non linear strain. Corresponding significant volumetric strains and residual volumetric strains were found. The results support the conclusions that the nonlinear stress - strain behavior observed during creep loading also occurs during transient loading at physiological rates. The volume increases suggest that damage accumulation, i. e., new internal surfaces and voids, plays a major role in this behaviour. The residual volume increases and associated disruptions in the internal structure of bone provide a potential stimulus for a biological repair response.

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