Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Mechanical Engineering > Materials 1 > Flashcards

Materials 1 Flashcards

NOT COMPREHENSIVE! Just some things that I have trouble remembering.

1
Q

How to derive engineering vs true stress relationship

A

Constant Volume assumption

V = A * L and σ = P/A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

How to derive engineering vs true strain relationship

A

Integrate ΔL/L

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What does %RDA stand for?

A

Percentage Reduction in Area

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Poisson’s Ratio for constant volume

A

v = 0.5

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Units of P in hardness tests

A

kg

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Stress Amplitude

A

Half the range

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Stress Ratio

A

σ(min) / σ(max)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Sensitivity to creep

A

Operating temp / Melting temp

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Bonds in Semiconductors

A

Covalent

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Bonds in Polymers

A

Covalent and Secondary

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Bonds in Metals

A

Metallic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Bonds in Ceramics

A

Ionic and Covalent

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Young’s Modulus equation based on atomic structure

A

E = (2q^2) / (π* ε* r^4)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

1 Mole

A

6.02 x10^23

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Selection metric for Maximum Elastic Energy Storage

A

M = UTS^2 / E

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Ductile failure shape

A

Cup and Cone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Ductile failure energy absorbtion

A

High energy absorbtion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Brittle failure shape

A

Flat

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Brittle failure energy absorbtion

A

Low energy absorbtion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Stages of creep (ε/t graph)

A

Initial elastic strain (linear, steep), primary creep (concave), steady-state creep (linear), tertiary creep (convex, accelerating), rupture

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Why is creep temperature dependent?

A

Creep is due to the diffusion of atoms

22
Q

Stress amplitude σa for first fatigue test

A

2/3 * UTS

23
Q

Typical fatigue testing frequencies

A

5-10 Hz

24
Q

Electrons in outer shell of metals

A

Nearly Empty

25
Q

Electrons in outer shell of non-metals

A

Nearly Full

26
Q

Non-directional Bonds

A

Ionic, Metallic

27
Q

Directional Bonds

A

Covalent

28
Q

Signs for bond potential energy

A

Attraction -ive
Repulsion +ive

29
Q

Signs for bond forces

A

Attractive +ive
Repulsive -ive

30
Q

Define Crystal

A

Homogenous solid. Atoms/molecules arranged in a regular repeating pattern.

31
Q

Material with Simple Cubic Structure

A

Polonium

32
Q

Materials with Hexagonal Close Packed (HCP) structure

A

Magnesium, Titanium, Beryllium

33
Q

Materials with Face Centred Cubic (FCC) structure

A

Aluminium, Copper, Lead, (Iron between 910-1400 ℃)

34
Q

Materials with Body Centred Cubic (BCC) structure

A

Chromium, Tungsten, Iron (Below 910 and above 1400 ℃)

35
Q

HCP Lattice Slip Systems

A

1x3 = 3

36
Q

FCC Lattice Slip Systems

A

3x4 = 12

37
Q

BCC Lattice Slip Systems

A

2x6 = 12

38
Q

Critically resolved shear stress τ(crss)

A

σ * (cos(Φ) * cos(λ))max

39
Q

Minimum stress to cause yielding in a single crystal

A

σ = 2τ(crss)

40
Q

α - Fe is called…

A

Ferrite

41
Q

Ferrite Structure

A

BCC

42
Q

γ - Fe is called…

A

Austenite

43
Q

Austenite Structure

A

FCC

44
Q

δ - Fe Structure

A

BCC (from 1400 to melting temp)

45
Q

Fe3C is called…

A

Cementite

46
Q

Cementite Carbon Content

A

6.7% by weight

47
Q

“Eutectoid” carbon content for steel

A

0.8% C

48
Q

Eutectoid Structure (α + Fe3C) is called…

A

Pearlite

49
Q

Eutectoid α Phase Carbon Content

A

0.022% C

50
Q

Creep temp for metals

A

0.3 Tm

51
Q

Creep temp for ceramics

A

0.4 Tm

52
Q

How to increase Tg

A

Increase Chain Stiffness
Increase Bond Strength
Increase Molecular Weight

Mechanical Engineering (5 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions