Term
| Stress computed on the load divided by the initial cross sectional area. |
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Definition
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Term
| Which is greater? True toughness or engineering toughness? |
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Definition
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Term
| Tensile test that CORRECTS for the changing area of the sample |
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Definition
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Term
| The process in which a material elongates with time under an applied load. |
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Definition
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Term
| Reduction in stress that occurs when a component is subjected to a constant value of strain |
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Definition
| Stress relaxation (in polymers) |
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Term
| The result of dislocation-dislocation interactions in metallic crystals. |
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Definition
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Term
| When does the onset of plastic instability occur? |
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Definition
| At the ultimate tensile stress |
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Term
| The ability of a material to resist plastic deformation |
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Definition
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Term
| At what point does deformation become permanent? |
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Definition
| When the applied stress exceeds a critical value |
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Term
Ceramic or Metal?
Which has a steeper slope of a stress-strain curve in the elastic region? |
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Definition
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Term
| As temperature increases, strain _____. |
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Definition
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Term
| As temperature increases, impact energy _____. |
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Definition
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Term
| The amount of energy per unit volume that a material can absorb before rupturing. |
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Definition
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Term
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Definition
| a measure of the work done to fracture a test specimen |
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Term
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Definition
| the amount of deformation in the direction of the applied force divided by the initial length of the material. |
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Term
| The more energy absorbed, the _____ the toughness. |
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Definition
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Term
| Smash sphere into a sample then measure indentation |
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Definition
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Term
| Hammer through a material by swiping from a height |
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Definition
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Term
| Is iron BCC or FCC at room temp? |
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Definition
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Term
| Pull a rod apart (left and right) |
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Definition
| High Cycle Fatigue Testing |
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Term
| Pull a rod apart (up and down), thermally activated process |
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Definition
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Term
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Definition
| Temp at which behavior is 50% brittle, 50% ductile |
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Term
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Definition
| Vacancies migrate via diffusion along the grain boundaries rather than through interior of grain |
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Term
| How can you reduce coble creep or Nabarro-Herring creep? |
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Definition
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Term
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Definition
| Atoms diffuse through the lattice causing grains to elongate along the stress axis |
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Term
| The more energy needed to create the defective crack surface, the ____ the strength. |
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Definition
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Term
| Toughness is higher in thicker or thinner sections? |
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Definition
| Thinner b/c there is an increase in plastic deformation per unit volume of a thin material |
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Term
| Do BCC or FCC experience ductile to brittle transition temp? |
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Definition
| BCC b/c FCC is almost always ductile |
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Term
Brinell hardness test = tensile strength
T or F? |
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Definition
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