Question

a. The Poisson ratio for a volume conserving (incompressible) material is __________________. However, most real materials have Poisson ratio values that are larger / smaller (circle one).

b. How many atoms are contained in the unit cells of the following crystalline structures?

Simple cubic ____________ Body-centered cubic ____________ Face-centered cubic ____________

c. True / False (circle one) The average number of protons in an atom of Iron (Fe) is 55.845. The yield strength of a material increases / decreases (circle one) with increasing grain size.

d. Two materials whose alloy displays a binary eutectic behavior are more / less (circle one) soluble than two materials whose alloy displays a binary isomorphous behavior.

e. After raising the temperature of a steel rod to 850°C for several hours, the sample is quenched in oil. The surface of the sample is expected to be harder / softer (circle one) than the interior.

f. In the event that a particular material displays nonlinear elasticity, the Young's modulus cannot be used to characterize this elastic behavior. Instead, the _______________________ or the ____________________________ are typically used.

g. The value of KIc is typically larger / smaller (circle one) for a brittle material than it is for a ductile material.

h. Described the difference between a thermoset and a thermoplastic polymer. ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________

i. Site three molecular characteristics of a polymer that will influence the material properties: ___________________________________________________________________________ ___________________________________________________________________________ ____________________________________________________________________

Answer 1