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Chapter 9
MSE 2001
29
Other
Undergraduate 4
04/28/2016

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Term
Stress computed on the load divided by the initial cross sectional area.
Definition
Engineering stress
Term
Which is greater? True toughness or engineering toughness?
Definition
True toughness
Term
Tensile test that CORRECTS for the changing area of the sample
Definition
True tensile test
Term
The process in which a material elongates with time under an applied load.
Definition
Creep
Term
Reduction in stress that occurs when a component is subjected to a constant value of strain
Definition
Stress relaxation (in polymers)
Term
The result of dislocation-dislocation interactions in metallic crystals.
Definition
Strain hardening
Term
When does the onset of plastic instability occur?
Definition
At the ultimate tensile stress
Term
The ability of a material to resist plastic deformation
Definition
Hardness
Term
At what point does deformation become permanent?
Definition
When the applied stress exceeds a critical value
Term
Ceramic or Metal?

Which has a steeper slope of a stress-strain curve in the elastic region?
Definition
Ceramic
Term
As temperature increases, strain _____.
Definition
Increases
Term
As temperature increases, impact energy _____.
Definition
Increases
Term
The amount of energy per unit volume that a material can absorb before rupturing.
Definition
Toughness
Term
Impact energy
Definition
a measure of the work done to fracture a test specimen
Term
Strain
Definition
the amount of deformation in the direction of the applied force divided by the initial length of the material.
Term
The more energy absorbed, the _____ the toughness.
Definition
Higher
Term
Smash sphere into a sample then measure indentation
Definition
Brinell Hardness Test
Term
Hammer through a material by swiping from a height
Definition
Charpy Impact Test
Term
Is iron BCC or FCC at room temp?
Definition
BCC
Term
Pull a rod apart (left and right)
Definition
High Cycle Fatigue Testing
Term
Pull a rod apart (up and down), thermally activated process
Definition
Creep Testing
Term
DBTT
Definition
Temp at which behavior is 50% brittle, 50% ductile
Term
Coble creep
Definition
Vacancies migrate via diffusion along the grain boundaries rather than through interior of grain
Term
How can you reduce coble creep or Nabarro-Herring creep?
Definition
Increase grain size
Term
Nabarro-Herring creep
Definition
Atoms diffuse through the lattice causing grains to elongate along the stress axis
Term
The more energy needed to create the defective crack surface, the ____ the strength.
Definition
Higher
Term
Toughness is higher in thicker or thinner sections?
Definition
Thinner b/c there is an increase in plastic deformation per unit volume of a thin material
Term
Do BCC or FCC experience ductile to brittle transition temp?
Definition
BCC b/c FCC is almost always ductile
Term
Brinell hardness test = tensile strength

T or F?
Definition
True
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