Materials Science And Engineering
Materials Science And Engineering
10th Edition
ISBN: 9781119405498
Author: Callister, William D., Jr, RETHWISCH, David G., Jr., 1940- Author.
Publisher: Wiley,
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Chapter 9, Problem 51QAP
To determine

The mass fractions of a α ferrite and cementite in pearlite:

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In baseball, batters frequently attempt to hit a ball as far as possible. However, baseballs are inelastic with an officially required "coefficient of restitution" CR ≈ 0.55 on ash wood. The coefficient of restitution of a dropped ball iswhere H is the initial drop height, h is the max. height on the rebound, and h ≈ 2πH tan δ for a homogeneous material. Assuming that a baseball is homogeneous and has a storage modulus approximately the same as that of cork (E' = 18.6 MPa), what must the value of the loss modulus E'' be so that the ball is regulation?
The creep strain rate of a polymer (in “Hz”) is given by   where T is the temperature and Q = 100. kJ/mol is the activation energy. How long t will it take for a rod of this polymer to extend from 10. mm to 15 mm at 100. °C?
Creep compliance J(t) An amorphous polymer has Tg = 100 °C. A creep modulus of 1/J = 1 GPa was measured after t₁ = 1 h at T₁ = 90 °C. Suppose that log 10 a (T) = 17.5(T-Tg) 52+(T-Tg) 1 for this material. What is the shift factor a at T = T₁ relative to the reference Tg? What is the time t₂ required to reach a modulus of 1 GPa at T2 = 80 °C? TR = T = 100 °C |J(t) = 1 GPa-1 + log a(T₁) T₁ = 75 °C T₂ = 50 °C log tr log t₁ log t log t₂ = ?
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