A Damage Model for Nonlinear Tensile Behavior of Cortical Bone  

Oleh:

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

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Biomechanical Engineering vol. 121 no. 5 (1999), page 533-541.
Topik: BEHAVIOUR; damage model; non linear; tensile behaviour; cortical bone

Ketersediaan

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

Lihat Detail Induk

Isi artikel

To describe the time - dependent nonlinear tensile behaviour observed in experimental studies of cortical bone, a damage model was developed using two internal state variables (ISV's). One ISV is a damage parameter that represents the loss of stiffness. A rule for the evolution of this ISV was defined based on previously observed creep behaviour. The second ISV represents the inelastic strain due to viscosity and internal friction. The model was tested by simulating experiments in tensile and bending loading. Using average values from previous creep studies for parameters in the damage evolution rule, the model tended to underestimate the maximum nonlinear strains and to overestimate the non linear strain accumulated after load reversal in the tensile test simulations. Varying the parameters for the individual tests produced excellent fits to the experimental data. Similarly, the model simulations of the bending tests could produce excellent fits to the experimental data. The results demonstrate that the 2 -ISV model combining damage (stiffness loss) with slip and viscous behaviour could capture the non linear tensile behaviour of cortical bone in axial and bending loading.

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