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Matse 259 Exam 2 Questions And Answers
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Matse 259 Exam 2 Questions And Answers
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Solution 2024/2025Pepper
Matse 259 Exam 2 Questions And Answers
3 primary strengthening mechanisms ANS✔✔ grains size reduction, solid solution, stain hardening
slip definition ANS✔✔ process by which plastic deformation is produced by dislocation motion
slip plane definition ANS✔✔ crystallographic plane along which the dislocation line traverses
recovery definition ANS✔✔ some of the stored internal strain energy is relieved by dislocation motion
how does the net plastic deformation for the motion of edge and screw locations compare ANS✔✔ theyre the same
where does slip directions occur ANS✔✔ closest to the close packed direction
what kind of structure do slip planes have ANS✔✔ densest atomic packing
between FCC,BCC, and HCP which has the fewest slip systems ANS✔✔ HCP
what structures does twinning occur in ANS✔✔ BCC HCP in low temps and high rates of loading
twinning definition ANS✔✔ a shear force can produce atomic displacements such that on one side of a plane (twin
boundary), atoms are located in mirror-image positions of atoms on the other side
which has small bulk plastic deformation slip or twinning ANS✔✔ twinning
the smaller the grain diameter, the _______ the yield strength ANS✔✔ higher
, Solution
2024/2025
Pepper
strain hardening/cold working definition ANS✔✔ Phenomenon whereby a ductile metal becomes harder and stronger as
it is plastically deformed
how do trends in strain hardening compare in graphs with different alloys, see graphs in slides ANS✔✔ yield strength
and tensile strength have pretty similar trends, the alloy with the highest yield and tensile strengths has the lowest
ductility, the one with the middle strengths has the highest ductility
how are properties of strain hardening removed ANS✔✔ heat treatments at elevated temperatures
look at recovery, recrystallization, and grain growth pictures ANS✔✔
simple fracture definition ANS✔✔ the separation of a body into two or more pieces in response to an imposed stress
what does fracture always involve ANS✔✔ crack formation and propagation
review log scale ANS✔✔
types of fracture 2 ANS✔✔ ductile and brittle
difference between ductile and brittle fracture ANS✔✔ ductile absorbs high energy
what kind of fracture surface do you want to design ANS✔✔ moderately ductile(jagged looking edge)
ductile fracture surfaces description ANS✔✔ circles shapes throughout
brittle fracture surfaces description ANS✔✔ more distinct, longer lines
look at ductile fracture stages picture ANS✔✔
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