The value for the activation energy in the temperature region.
Answer to Problem 101AAP
The value for the activation energy in the temperature region is
Explanation of Solution
Write the equation involving the viscosity to temperature for a viscous flow in the glass.
Here, viscosity of the glass is
For the strain point, write the equation involving the viscosity to temperature for a viscous flow in the glass.
Here, viscosity of the glass at strain point is
For the softening point, write the equation involving the viscosity to temperature for a viscous flow in the glass.
Here, viscosity of the glass at softening point is
Conclusion:
Convert the unit of strain point temperature to absolute value.
Convert the unit of softening point temperature to absolute value.
Divide Equation (II) by Equation (III).
Substitute
Thus, the value for the activation energy in the temperature region is
Want to see more full solutions like this?
Chapter 11 Solutions
Foundations of Materials Science and Engineering
- What is Gorilla Glass from Corning? Why does it outperform regular window glass in terms of mechanical properties? Briefly explain utilizing basic mechanical principles. When necessary, provide diagrams to further explain your response.arrow_forwardCalculate the typical relaxation time for silicate glassand comment on its propensity for stress relaxation at roomtemperature. E ~ 70 GPa and η ~ 1 x 1012 GPa-s (1022poise).arrow_forwardPolyethylene Terephthalate or PET is a linear semicrystalline thermoplastic polymer widely used in food packaging. Calculate the density of this polymer when the total crystallinity is 65.4%. The density for the totally amorphous PET material is 1.33 g/cm³, and the density of the totally crystalline is 1.44 g/cm³. 1.38 g/cm³ 1.40 g/cm³ 1.42 g/cm³ 1.80 g/cm³ None of the abovearrow_forward
- State four (4) factors that can influence the variability in fracture strength of ceramic components.arrow_forwardA 1.02den silk fiber has reached its maximum tenacity value. How many grams (force) would it take to rupture such fiber when dry? Provide your answer with two (2) decimal positions and no unit Answer:arrow_forwardThe modulus of elasticity for a ceramic material having 4.1 vol% porosity is 323 GPa. (a) Calculate the modulus of elasticity (in GPa) for the nonporous material. E = i E = (b) Calculate the modulus of elasticity (in GPa) for 11.7 vol% porosity. GPa i GPaarrow_forward
- Nowadays, many cooking utensils are made of polymeric materials. However, people believe that heating plastic utensils would cause harm such as releasing toxic substances. Hence, people are looking for other alternatives to replace plastic. Choose ONE cooking utensil (spatula) and identify the suitable material that will satisfy its criteria. Justify your answer. Your discussion must include the interrelationship between structure-properties-processing of the selected cooking utensil.arrow_forward"The tensile modulus of a given polymer increases as its crystallinity increases" Is this statement True or False? Provide an argument with a simple drawing to support your answer.arrow_forwardNylon 6,6 is a thermoplastic polymer with high mechanical strength, high resistance to chemical environments, and good stability under heat. Therefore, it is well suited to be used in 3D structural objects. A cylindrical nylon 6,6 pipe is made by injection molding. The pipe is 1 m long with an outer diameter of 8cm, and a thickness of 2mm. The crystallinity of the pipe is 25%. The density and associated percent crystallinity for two nylon 6,6 samples are measured as below: ρ(g/cm3) crystallinity (%) 1.190 67 1.155 44 Calculate the density of this pipe, which has 25% crystallinity.arrow_forward
- Nylon 6,6 is a thermoplastic polymer with high mechanical strength, high resistance to chemical environments, and good stability under heat. Therefore, it is well suited to be used in 3D structural objects. A cylindrical nylon 6,6 pipe is made by injection molding. The pipe is 1 m long with an outer diameter of 8cm, and a thickness of 2mm. The crystallinity of the pipe is 25%. The density and associated percent crystallinity for two nylon 6,6 samples are measured as below: ρ(g/cm3) crystallinity (%) 1.190 67 1.155 44 If the degree of polymerization is 500, calculate the number of chains in the pipe. (Assume the chains are equal in length).arrow_forwardQuestion 6 During an extrusion process, a chromium billet at a temperature of 1300°C, need to be extruded from a billet diameter of 13 mm to a final diameter of 0.35 mm. An extrusion die are required to withstand the temperature and forces occurring during the process. 6.1 Which ceramic material will you suggest for this application? Provide reasons for your selection. 6.2 If the ceramic material, selected in Question 6.1 have an UTS. = 915 MPa, porosity of 16 % and n = 4, calculate the tensile strength and elastic modulus of the ceramic at room temperature.arrow_forward(Porosity). A dry rock weighs 240 grams and has a bulk density of 2.4 grams per cubic centimeter. When saturated with pure water at room temperature (T=25°C), it weighs 250 grams. At room temperature, specific volume of water is 1.00295 x10-3 m3/kg. Calculate the porosity of the sample. (Permeability). A cylindrical core sample of 1 cm length and 1 cm2 cross-section has upstream and downstream pressures of 2 atm and 1 atm, respectively, during steady state flow of water at 0.997 g/s at room temperature. Calculate the permeability of the core. Note: Water @ 25°C, viscosity = 1 cp, density of water = 0.997 g/cm3. SHOW SOLUTIONS PLSarrow_forward
- Elements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University PressMechanics of Materials (10th Edition)Mechanical EngineeringISBN:9780134319650Author:Russell C. HibbelerPublisher:PEARSONThermodynamics: An Engineering ApproachMechanical EngineeringISBN:9781259822674Author:Yunus A. Cengel Dr., Michael A. BolesPublisher:McGraw-Hill Education
- Control Systems EngineeringMechanical EngineeringISBN:9781118170519Author:Norman S. NisePublisher:WILEYMechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage LearningEngineering Mechanics: StaticsMechanical EngineeringISBN:9781118807330Author:James L. Meriam, L. G. Kraige, J. N. BoltonPublisher:WILEY