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Mat E 202 > Week 2 > Flashcards

Week 2 Flashcards

(66 cards)

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1
Q

Metal necking: deformation _________ occurs in ______ place

A

Concentration

One

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2
Q

(And why)

A

The one on the left

(%RA)

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3
Q

Ceramics have _______ and _______ bonds

(Do atoms move easily)

A

Covalent

Ionic

(Atoms don’t move easily)

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4
Q

List the 2 types of ceramics

A

Crystalline

Amorphous

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5
Q

What type of ceramic is this

A

Crystalline

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6
Q

What type of ceramic is this

A

Amorphous

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7
Q

Can atoms move past each other in ceramics?

(And explain)

A

NO

(Because of strong bonds)

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8
Q

Metallic bonds: atoms can usually _____

A

Slip

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9
Q

What type of shape is this called

A

FCC

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10
Q

What type of shape is this called

A

BCC

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11
Q

What type of shape is this called

A

HCP

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12
Q

Polymers: covalent bonds within ______, secondary bonds _______ chains

A

Chains

Connecting

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13
Q

Where do we see deformation in polymers

A

In the SECONDARY BONDS

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14
Q

Polymers: funny name for them is molecular ______

A

Spaghetti

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15
Q

(What class of materials is this) Describe what is happening at each stage

A

Polymers

1) undeformed

2) elastic deformation

3) increasing chain alignment

4) chain sliding

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16
Q

In metals, deformation is concentrated in the
________ ________

A

Necked region

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17
Q

Deformation: in POLYMERS the neck _________ through the entire ______ ______ length

A

Propagates

Reduced section

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18
Q

Tensile toughness can be found from a stress strain graph as what?

A

The area under the curve

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19
Q

Bruh

A
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20
Q

Strong bonds = ______ materials

A

Stiff

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21
Q

List the 5 types of bonds from strongest (stiffest) to least

A

1) covalent

2) metallic

3) ionic

4) hydrogen bond

5) Van der Waals

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22
Q

Strong bonds= ____ melting points

A

High melting points

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23
Q

List the three types of bonds from highest to lowest melting points

(Metallic, van der Waals, covalent)

A

Covalent

Metallic

Van der Waals

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24
Q

What does “Von Mises stress” refer to

A

Non-uniform stress states

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25
What does non-uniform stress states mean (And 2 examples)
Bi or tri axial stress (Flaws, cracks)
26
27
Which two scales can stresses be complex at
Macro scale Micro scale
28
Micro or macro stress scale?
Macro
29
Micro or macro stress scale?
Micro
30
Where is the gauge width on a dog bone
31
Where is the overall width on a dog bone
32
What is the specimen length of the dog bone
33
DUCTILITY DEPENDS ON: gauge ______
Length
34
How are hardness measurements done
Apply know force, measure depth or width of indent
35
What does HB and HBR stand for
HB: Brinell hardness HBR: Rockwell B scale
36
Does hardness testing or tension testing give us MORE information
Tension testing
37
Why would we do hardness testing (if tension testing gives us more info) List 6 things
Cheaper Faster Easy to interpret Mostly non destructive No machining Localized variations in properties
38
What else can cause variations in mechanical testing (apart from compositional variations) List 4 things
-machining variations -operating bias -calibration -inhomogeneities
39
What does “inhomogenieites” refer to And list 3 examples
No material is uniform (Cracks, inclusions, localized composition variations)
40
What does the safety factor have to be GREATER than
1
41
Brittle materials: the worst flaw dictates _____
Strength
42
Why are smaller ceramics stronger (in tension)
Small sample has on average smaller flaws
43
Ceramics: what is greater bending strength or tensile strength
Bending strength
44
Where is the largest flaw in this ceramic
The longest line
45
Where is the max tension in this ceramic
In the middle
46
Failure can occur over a _______ of stresses
RANGE
47
What does the Weibull distribution graph look like (And key value on it)
m=Wiebull modulus
48
Weibull distribution graph: where are low m values and what do they mean
Wide variability, m=5 for chalk, cement, bricks)
49
Weibull distribution graph: where are high m values and what do they mean
Little variability in materials
50
Wiebull distribution graph: what does it mean if m>20
51
What is the approximate probability of survival (Weibull distribution)
36%
52
What is this variable on the Weibull distribution graph
Reference stress where survival probability is 1/e
53
What are the 3 factors of wear rate
54
Is wear rate intrinsic or extrinsic and why
55
HIGHER values of the Archard wear constant mean what?
Faster wear
56
What is the red (middle largest) area on the west rate constant vs hardness graph
Metals
57
What is the blue area (furthest to the left) on the wear rate constant vs hardness graph
Polymers and elastomers
58
What is the green area (furthest to the right) on the west rate constant vs hardness graph
Technical ceramics
59
What are thermoplastics
Plastics that MELT
60
______ particles cause implant failures
Wear
61
Give 3 examples of wear
62
Poisson’s ratio: only applies to _______ deformation (And why)
ELASTIC During plastic deformation the volume is constant
63
What can you find with Poisson’s ratio?
Strains
64
Define creep
The slow and gradual deformation of materials, often caused by constant stress or a load over an extended period
65
Give an example of creep
Deformation of metals
66
What does the Weibull distribution show
Models the time until failure occurs

Mat E 202 (10 decks)

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