Numerical methods & Viscoelastic models of Elastomers — Winter 2023

Discuss in detail about the types of stresses with suitable example.

Awire is stretched by the application of a force of 50 kg wt/sq. cm. What is the percentage increase in the length of the wire? Y = 7 × 1010 N/m², g = 9.8 m/s²

Arubber thread (Y = 20 × 1010 N/m². and σ = 0.26) of length 3 m and diameter 0.1 cm is stretched by a load of 10 kg. Calculate the decrease in diameter of the wire.

Discuss in detail about the phenomena of Viscous flow.

Mention the effective ways of physical crosslink chains.

Define the terms: (i)Viscosity (ii) Elasticity (iii) Viscoelasticity (iv) Newtonian fluid

Describe the effect of Entropy of Elasticity in detail.

State the three assumptions of experiments on polydisperse polymers.

Mention the requirement and properties of typical elastomer.

Derive the equation of viscosity and write its nomenclature.

Draw the figure of Oswald viscometer and explain it in detail.

Write about the Ideal elastomer with its equation.

Derive the equation of specific viscosity for a dilute solution of hard spheres.

Explain a brief note on Time –Temperature superposition principle.

Classify the polymeric materials based on mechanical behaviour.

Distinguished between Relaxation and Retardation spectra.

Derive the equation of Creep experiment for Voigt model.

Draw the figure of Four parameter model and discuss it in brief.

Discuss in detail about the Ideal solid and Ideal liquid material model.

Draw the classification flow chart of fluid and explain any one in detail.

State the three major observation of phase state of substance.

Draw the figure and write the working principle of Dilatometer.

Discuss in detail about the explanation of Dilatant fluid.

Write the effect of chain flexibility and geometric factor on glass transition temperature.

Distinguished between crystalline and amorphous.