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Unformatted text preview: Unkinking and uncloiling of long polymer chains • Plasticity in Polymers o Viscoelasticity and viscoplasticity, what are they physically Former it is unkinking of chains, latter it is permanent chain sliding into more favorable orientations o How do you model a polymer? Complicated array of Springs and Dampers Associated equations for Maxwell and Voight Model Solve the Voight Model and discuss what the solution means physically • How to solve a plate problem with a circular hole in it o I never did this before, so I just write down all the possible equations necessary Simplified version of 2 2 x u f ∂ ∂ = + ⋅ ∇ ρ σ , compatibility, how many unknowns (ε xx , ε yy , ε xy ), etc. • Fracture Mechanics o Derive crack growth condition using Griffiths Criterion o Estimate plastic zone size When does LEFM apply? What do you use if it does not apply (EPFM)? How does this tie into J 2 plasticity theory?...
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- Spring '10
- Materials Science, Voight Model, Wole Soboyejo, Crystalline Polymers Bonding, Polymers o Viscoelasticity