Lecture191 - Viscoelastic Material Behavior Creep Tests...

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Objectives 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)? What is the influence of loading rate (Theory of Viscoelasticity)?
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Theory of Viscoelasticity σ = σ (ε29 σ = σ (ε ε 29 . Insert fig 9.2 Page 198
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Analogy Between Spring & Elastic Solids
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Insert Fig 9.4 Page 198 Insert full Fig 9.5 Page 198 Analogy Between Viscous Fluid & Dashpot
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Empirical Models of Viscoelasticy
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Kelvin-Vioght Model Insert fig 9.7 Pg 199
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Maxwell Model
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Standard Solid Model
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Experimental Determination of
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Unformatted text preview: Viscoelastic Material Behavior Creep Tests Experimental Determination of Viscoelastic Material Behavior Stress Relaxation Tests Experimental Determination of Viscoelastic Material Behavior Oscillatory Response Tests Elasticity vs Viscoelasticity Elasticity vs Viscoelasticity • Bone displays viscoelastic material properties. • Properties vary with loading rate. • Stiffer and stronger at higher rates. Influence of Rate on Bone Fracture Properties How to break bones? IMPACT ‘EM Low energy (Torsional ski fracture) High energy (Automobile accidents) Very High Energy (Gunshots)...
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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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Lecture191 - Viscoelastic Material Behavior Creep Tests...

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