Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
36 Cards in this Set
- Front
- Back
|
What is a grain |
A crystalline of atoms, in which atoms pack in a repeated periodic arrangement |
|
|
What is a Polycrystalline |
A solid composed of many small grains |
|
|
When does necking occur during tensile testing |
When the engineering stress equals the ultimate tensile stress |
|
|
At the UTS the engineering Stress is equal to? |
Applied load/Ao where Ao is the original cross sectional area. |
|
|
How is true stress related to engineering stress? |
True stress = engineering stress*(1+e) where e is the engineering strain. |
|
|
In engineering stress, what is ‘e’ |
e = to the fractional change in length which is the elongation/original length |
|
|
In their normalised state condition, low-carbon steels generally have C concentrations, tensile strengths and ductilities (%elongation to failure) of: |
<0.25 wt%, 415-550 MPa, 25% |
|
|
Which of the following is the correct order of increasing metal density? A: Al, Mg, Cu, Fe B: Al, Mg, Fe, Cu C: Mg, Al, Fe, Cu D: Mg, Al, Cu, Fe |
C: Mg, Al, Fe, Cu |
|
|
Why is Titanium not widely used in engineering? |
High cost |
|
|
The hardest and highest melting temperature, metal is: A: Fe B: W C: Ti D: Diamond |
B: W (Tungsten) |
|
|
What Is Creep? |
The time dependent permanent deformation of metals when subjected to a constant stress below the yield stress. It occurs at high temperatures. |
|
|
If you wanted to increase the strength of a material you could? |
Cold work the material |
|
|
What will increasing the strain rate if a tensile test normally do to a metal such as aluminium> |
Increase the yield strength |
|
|
Recrystallisation during annealing only occurs if? |
The metal has previously been cold-worked. |
|
|
Once recrystallisation has been completed, continued heat-treating of strain-hardened alloys can result in? |
Grain Growth |
|
|
What wouldn't improve the fatigue resistance of a component? |
Designing-out surface notches and sharp re-entrant angles |
|
|
Coefficient of Thermal Expansion Equation |
Change in Stress = Young's Modulus x Coefficient of Thermal Expansion x Change in Temperature |
|
|
Stress Equation (without Strain) |
Stress = Force/Area |
|
|
What is Young's Modulus Equal to? |
Stress/Strain |
|
|
Hall-Petch Equation |
Sigma(y) = sigma(o) + K*d^-1/2 |
|
|
Hot Forming work done per unit volume during deformation Equation |
(Constant)*yield stress*strain increment |
|
|
Yield stress to Vickers Hardness |
3*Whatever The Stress Is |
|
|
What does tempering do to a metal? |
Tempering increases the toughness and ductility |
|
|
Age hardening of Al-Cu alloys is also known as? |
Precipitation Hardening |
|
|
Nickel alloys are used for compressor blades in gas turbines because? |
They are oxidation and corrosion resistant |
|
|
The good machinability of grey cast iron is due to the presence of? |
Graphite Flakes |
|
|
Alpha Brass is an Alloy Containing? |
70%Cu, 30%Zn |
|
|
The Structure of a 0.2% Carbon Steel After Normalising is? |
Fine Ferrite and Pearlite |
|
|
Steel becomes stainless steel because of the addition of? |
13%Cr |
|
|
Polyvinyl chloride (PVC) is a stiff polymer due to? |
The addition of a plasticiser |
|
|
What causes weakness in concrete? |
Too little aggregate added to the mixture |
|
|
Which elements are added to produce low alloy steel? |
Nickel, Chromium and Molybdenum |
|
|
Are ceramic materials inert chemical compounds? |
Yes |
|
|
Do polymers tend to have a reduced ductility when deformed at higher strain-rates and lower temperatures? |
Yes |
|
|
True Strain |
ln(1+e) e is engineering strain |
|
|
Name all parts of the Sigma=K*Epsilon^n |
Sigma=Stress, K=Constant, Epsilon=True Strain, n=the same as epsilon |
