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LSU ME 3701 final (quizzes and homeworks) Assessment Test Questions And Answers 100% Verified.
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  • ENGR 3701
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  • ENGR 3701

What are the three characteristic crystal structures encountered in metals - correct answer FCC,BCC,HCP In which family of planes is the atomic density highest in FCC and BCC materials - correct answer {1,1,1} because it i...

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  • December 29, 2024
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  • 2024/2025
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LSU ME 3701 final (quizzes and
homeworks)

What are the three characteristic crystal structures encountered in metals - correct answer
FCC,BCC,HCP



In which family of planes is the atomic density highest in FCC and BCC materials - correct answer
{1,1,1} because it is family of planes



Which of the two crystalline structures: FCC and BCC, has the largest atomic packing fraction - correct
answer FCC



What are the possible (hkl) planes in FCC crystals that satisfy Bragg's law? ( two examples) - correct
answer FCC (1,1,1) and (2,0,0)



The wavelength of typical X-rays used in diffraction experiments are of the order of (or fraction of): A)
millimeters B) nanometers C)micrometers - correct answer B) nanometers



Define two materials mechanical properties of metal or metallic alloy - correct answer
Hardness: measure of how much localized plastic deformation a material can withstand

Toughness: measure of how much energy a material can absorb before fracturing



What are the two standard tests used for measuring Impact Energy - correct answer
Izod and Charpy test



What is the main reason for using Chauvenet's Criterion when analyzing experimental data consisting a
repeated measurement of a property - correct answer So the outlying data can be
discarded from graphs and make data more accurate

, briefly describe the measurement of Rockwell hardness of a material - correct answer
measures the depth of penetration of an indenter under a large load (major load) compared to the
penetration made by a preload (minor load).



Why do we apply the minor load during a Rockwell hardness measurement - correct answer
to allow the indenter to penetrate the material surface, thus eliminating any errors causes by surface
roughness.



Briefly explain the differences between [1 1 1], (1 1 1), <1 1 1> and {1 1 1}. - correct answer
(111)-coordinates of specific plane

[111]-specific direction

{111}-family of planes

<111>-family of directions



Expressions for engineering stress(o-) and engineering strain(e): load(force) P, the initial cross-sectional
area Ao, initial length Lo, final Length L. - correct answer o- = P/Ao

e = L - Lo/Lo



What is the modulus of elasticity (E) and how would you calculate its value - correct answer
E = o-(engineering stress) / e(engineering strain)

the ratio of stress, below the proportional limit, to the corresponding strain.



Define the Yield strength of the steel specimen and describe the procedure you would use to find the
yield strength from stress-strain graph - correct answer the stress at which a
predetermined amount of permanent deformation occurs.

The results of the test are plotted on stress-strain curve. The stress at the point where the stress-strain
curve deviates from proportionality is the yield strength of the material.



What is the modulus of resilience - correct answer the area under the curve up to
the yield strength



When loading a specimen in tension what do we call the stress level beyond which the necking starts to
occur - correct answer Ultimate or Tensile Strength

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