The bulk modulus for water is given 2.1GPa. Compute the change in volume of 200ml water that is subjected to a stress of 2MPa.
[3 marks]When a brass rod of diameter 6 mm is subjected to a tension of 5 × 103 N, the diameter changes by 3.6 × 10-4 cm. Calculate the longitudinal strain and Poisson’s ratio for brass given that Yfor the brass is 9 × 1010 N/m².
[4 marks]Derive the equation for bulk modulus and young modulus.
[7 marks]Describe the difference between Newtonian and non-Newtonian fluids based on their viscosity behavior.
[3 marks]Explain the significance of intrinsic viscosity and how it relates to molecular weight.
[4 marks]Evaluate the effectiveness of using Einstein's theory for calculating the viscosity of real polymer solutions compared to more complex models.
[7 marks]Draw the diagram of Oswald viscometer and explain in detail about the viscosity measurement procedure.
[7 marks]Define the terms: (i) Enthalpy (ii) Entropy (iii) Ductility
[3 marks]Explain how stretching rubber leads to a decrease in entropy. Why does this decrease occur?
[4 marks]Discuss in detail about the explanation of pseudoplastic fluid behavior with example.
[7 marks]Write about the structure of an ideal rubber
[3 marks]Compare the free energy change in rubber when it is stretched versus when it is relaxed. What roles do enthalpy and entropy play in this comparison?
[4 marks]Discuss in detail about the explanation of viscoplastic fluid and dilatant behavior with example.
[7 marks]Mention the key properties required for a material to be classified as an elastomer.
[3 marks]Explain why elastomers must be above their glass transition temperature to exhibit rubbery behavior.
[4 marks]Derive the equation of stress relaxation experiment for maxwell model.
[7 marks]Describe the significance of crosslinks in elastomeric materials.
[3 marks]If a certain elastomer exhibits a low permanent set after being stretched, what can be inferred about its molecular structure?
[4 marks]Derive the equation of creep experiment for Voight model.
[7 marks]Define linear viscoelasticity in the context of the Boltzmann Superposition Principle.1
[3 marks]Describe how the Deborah number relates to the behavior of viscoelastic materials.
[4 marks]Discuss in detail the factors influencing the Glass transition temperature.
[7 marks]Toluene behaves as a plasticizer for polystyrene. Estimate Tg of a polystyrene sample containing 40 vol% toluene.
[3 marks]Explain how the Time-Temperature Superposition Principle relates temperature to the viscoelastic behavior of materials.
[4 marks]Explain different plots showing variation of specific volume with temperature.
[7 marks]