Lecture181 - Material Properties of Cortical Bone(Vashishth...

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Material Properties of Cortical Bone (Vashishth 1997) 84 (11) 2.0 (0.15) 68 (7) 1.39 (0.24) 5.6 (0.8) Torsion 210 (22) 1.22 (0.16) 207 (23) 1.19 (0.11) 22.4 (2.5) Compression 159 (8) 3.89 (0.79) 131 (5) 0.80 (0.03) 22.9 (2.2) Tension U.Stres s (MPa) U.Strain (%) Ystress (MPa) Ystrain (%) G (GPa) E (GPa) Loading
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Fracture Surface Profiles Yields due to tensile stress Yields due to shear stress
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OK. .Tell me how it all happened?
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Objectives Analysis of Stress and Strain How to predict fracture (Failure theories based on concept of principal Stress/strain & maximum shear stress/strain) Are material properties same in all direction (Theory of material Anisotropy)?
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Analysis of Stress & Strains
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How to Measure?
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What to Measure? Need to define parameters that are can be universally understood and have some physical meaning
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Theory: Plane Stress Assumption
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Transformation Equations of Plane stress
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Maximum Principal Stress
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Maximum Principal Stress If τ x1y1 =o then Shear Stresses are zero on principal planes
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Maximum Shear Stress
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Principal & Maximum Shear Strains
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Inclass Exercise 10 mts
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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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Lecture181 - Material Properties of Cortical Bone(Vashishth...

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