Lecture171 - Objectives • To understand the type of...

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Unformatted text preview: Objectives • To understand the type of loading that is applied on bones during day-to-day and under trauma. • To understand how bone geometry influences the distribution of load (stresses) • Use mechanical properties of bone to explain clinical fractures. In-vivo Loading Compression σ = Force Area In-vivo Loading Bending σ = Μ y I I Π d 3 t 8 = Π (d 2 4-d 1 4 ) 64 Approximate formula When ‘t’ is small I= In-vivo Loading Torsion τ = T r I p = Π (d 2 4-d 1 4 ) 32 Hollow Uniform cylinder In-vivo Loading Combined Bending-Torsion-Compression Influence of bone geometry on mechanical behavior of bone Ten sion Co mp res sion Be nd ing Tor sion Co mb ined Lo adi ng Mo de of load ing Influence of bone geometry on mechanical behavior of bone Tension & Compression Lo we r St res se s Gr ea ter Ar ea σ = Force Area Influence of bone geometry on mechanical behavior of bone Bending Gr eater Stress es Gr eater Mo m ent Gr eater Leng th σ = Μ y I Influence of bone geometry on mechanical behavior of bone Bending Low er stress G reater Mo m ent of Iner tia Be am I=[B( H^ 3)]/12 σ = Μ y I Influence of bone geometry on mechanical behavior...
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This note was uploaded on 09/07/2008 for the course BMED 4540 taught by Professor Vashishth during the Fall '07 term at Rensselaer Polytechnic Institute.

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Lecture171 - Objectives • To understand the type of...

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