206

Front 1

Stress formula

Back 1

F/A

Front 2

Strain Formula

Back 2

Lf-Lo / Lo

Front 3

The goal of running afatigue test for a material is to find the stress level below which no fatiguefailure will ever occur. This stress level is called ":

Back 3

Endurance Limit

Front 4

Hardness is a measure of a materials resistance to

Back 4

penetration

Front 5

Standard measure of testing used to generate stress - strain relationship is called

Back 5

tensile testing

Front 6

Philosoph of conducting a materials life cycle assessment is to incorporate the (blank) in to the decision making process for material selections

Back 6

Enviromental impact of products

Front 7

After being continuously loaded for a long period of time a material may even fail at a load level below it's yield point, This kind of material behavior or failure mechanism is called

Back 7

creep failure

Front 8

Noncrystalline materials are also known as_____ material

Back 8

Amorphous

Front 9

Which of the following is a non crystalline material

Back 9

polymer

Front 10

A material is classified as a ductile material if it's percent elongation is greater than ___ percent

Back 10

5 percent

Front 11

The mechanical property of

Back 11

Van der waals

Front 12

When a material is subjected to ____ loading on a long term basis, it's fatigue strength has to be considered

Back 12

cyclical

Front 13

_______ has been utilized to determine whether a material has the ductile to brittle transition property

Back 13

impact testing

Front 14

Burning one gallon of gasoline which weighs about 3kg will emit about 9kg of CO2

Back 14

9kg (*3)

Front 15

MPa is a unit for

Back 15

Stress or Strength

Front 16

For an Aluminum product how much energy can be saved using recycled aluminum instead of freshly made aluminum

Back 16

95 percent

Front 17

Which of the following has the highest embodied energy

Back 17

Device Grade Silicon / Aluminum Alloys

Front 18

Diameter of most atoms falls within the range

Back 18

1X10_-10 to 5x10 -10

Front 19

When a material possesses identical material properties along all directions it is called a ______ material

Back 19

Crystalline

Front 20

What are two crystalline materials that are used in industry and what are their applications

Back 20

Diamond single crystals are used as abrasives

Silicon wafers are used in computer chips

Front 21

LED

Back 21

Light Emitting Diode

Front 22

CFL

Back 22

Compact Fluorescent Lamp

Front 23

ABS

Back 23

Acrylonitrile Butadiene Styrene

Front 24

HDPE

Back 24

High Density Polythylene

Front 25

PA

Back 25

Polyamide

Front 26

PC

Back 26

Polycarbonate

Front 27

PET

Back 27

Polyethelyne Terephthalate

Front 28

PMMA

Back 28

Poly(Methyl Methacrylate)

Front 29

POM

Back 29

Polyoxymethylene

Front 30

PP

Back 30

Polypropylene

Front 31

PVC

Back 31

Polyvinyl Chloride

Front 32

UHMWPE

Back 32

Ultra High molecular weight Polyethylene

Front 33

GFRP

Back 33

Glass Fiber Reinforce Plastic / polymer

Front 34

GHG

Back 34

Green house gasses

Front 35

CFV

Back 35

Carbon Footprint Verification

Front 36

S-N Diagram

Back 36

Stress vs number of loads cycles

Front 37

HR

Back 37

Rockwell Hardness

Front 38

HB

Back 38

Brinell Hardness

Front 39

HV

Back 39

Vickers Hardness

Front 40

STM

Back 40

Scanning Tunneling Microscopy

Front 41

RoHS

Back 41

Restriction of Hazardous Substances

Front 42

LCA

Back 42

Life Cycle Assesment

Front 43

TEM

Back 43

Transmission Electron Microscopy

Front 44

STM

Back 44

Scanning tunneling Microscopy

Front 45

BCC

Back 45

Body Centered Cubic

Front 46

FCC

Back 46

Face centered Cubic

Front 47

CNT

Back 47

Carbon nanotube

Front 48

What are unicell structure

Back 48

BCC and FCC and HCP

Front 49

What is creep?

Back 49

deformation from constant load below the yield strength

Front 50

Fatigue

Back 50

When a material is subjected to cyclical loading

Front 51

Toughness

Back 51

The Amount of energy that a material can absorb per unit volume before rupture

Front 52

What is hardness?

Back 52

The materials resistance to penetration

Front 53

What are the 5 material properties

Back 53

Strength, Elasticity, Hardness, toughness, ductility

Front 54

Metals

Back 54

Ferrous and nonferrous

Front 55

Polymer

Back 55

plastic and rubber

Front 56

Ceramics

Back 56

Glass, cement

Front 57

Composite

Back 57

Fiber / resin, concrete, plywood

Front 58

Semi conductors

Back 58

Computer chip

Front 59

Embodied Energy

Back 59

Energy required to produce materials from ores or feedstocks

Front 60

Why are auto tires all black in color

Back 60

Carbon blended rubber

Front 61

What is the typical material used for the structures of new generation aircrafts

Back 61

Composite and aluminum

Front 62

Toilet bowl is made of

Back 62

Porcelain ceramics and slip mold casting

Front 63

How much energy can be saved by replacing incandescent bulb with LED

Back 63

76 percent energy saved

Front 64

How are Solar panels made and how do they work?

Back 64

They are semiconductors

Front 65

How much CO2 will be realeased to the atmosphere from burning 1 gallon of gas

Back 65

9.07 kg

Front 66

How do we make our living environment sustainable?

Back 66

implement LCA (Life cycle awareness)

Front 67

Why recycle materials?

Back 67

Aluminum-95 percent less energy

Steel - 33 percent

Paper - 40 percent

plastic -90

glass-30

Front 68

Carbon footprint

Back 68

Total amount of GHG emissions caused directly and indirectly by an individual organization event or product

Front 69

Top greenhouse gas?

Back 69

Carbon Dioxide

Front 70

Fossil fuels create ___ percent of co2 emission

Back 70

95

Front 71

Mechanical behavior testing

Back 71

Tensile - elastic modulus, stiffness, ductility

Impact test- energy required to fracture a material

hardness test - hardness wear and tear

Front 72

Thermal behavior

Back 72

conductivity, heat capactiy, expansion, and melting temp

Front 73

Magnetic

Back 73

Electrical, optical and corrosion

Front 74

What are the typical mechanical properties

Back 74

Elastic modulus, strength, ductility, Hardness, toughness, creep resistance, Visco elasticity

Front 75

______ : sigma = E * epsilon Where E is the modulus of elasticity

Back 75

Hookes law

Front 76

Stiffness is the opposite of?

Back 76

Elasticity so use elastic modulus

Front 77

Deflection is

Back 77

The shape and stiffness of a beam determine the amount of deflection for a given load

Front 78

Shear Stress is

Back 78

Sheer modulus * Shear strain = G

concerns with the deformation of a solid when it experiences a force parallel to one of its surfaces while it's opposite face experiences an opposite force

Front 79

Ductility is equal to

Back 79

Percent elongation at fraction = (Lf-Lo)/Lo * 100 percent

Greater than 5 percent = ductile, less than 5 percent = Brittle

Front 80

Modulus of toughness is equal to

Back 80

the total area under the stress strain curve at the point of rupture

Front 81

Viscoelasticity

Back 81

Propertyy of materials that experience both liquid and solid characteristics when underghoing deformation

Front 82

Rheology is the study of

Back 82

viscoelasticity

Front 83

Metallic bonds

Back 83

sea of free valence electrons

Front 84

Covalent bonds

Back 84

sharing of valence electrons

Front 85

Ionic bonds

Back 85

Between cations and anions

Front 86

Physical bonds

Back 86

Van der waal bonds

Front 87

Weakest link theory

Back 87

Plastic is as weak as the weakest bond in it

Front 88

Crystalline solids are formed by

Back 88

stacking of atoms in a specific fashion

Front 89

Polymer are made up of what bonds

Back 89

Covalent and secondary bonds

Front 90

Crystals bonds

Back 90

Semiconductors (covalent bonds)

Ceramics covalent and ionic bonds

Metals - metallic bonds

Front 91

Crystal is

Back 91

solid with the atoms or molecules or ions are packed in a regularly ordered repeating pattern in all 3 dimensions

Front 92

Lattice

Back 92

Imaginary skeleton of a crystal structure

Front 93

Unit cell

Back 93

Subdivision of a lattice that still remains the overall characteristics of the entire lattice

Front 94

Elements or materials that exist in mor ethan one crystal structure are called

Back 94

Allotropic

Front 95

Crystal impurity

Back 95

results in a solid solution, not really a bad things, affects clarity of a diamond

Front 96

Structural defects (4 classes)

Back 96

Vacancies and interstatial points

Dislocations (1d line)

Grain boundaries (2 d planar)

Noncrystalline or amorphous (3d)

Front 97

Substitutional Solid Solutions

Back 97

Solute is too big to fit in the cracks so replaces the solvent

Front 98

Interstatial Solid Solutions

Back 98

Small enough to fit in the cracks, i.e Steel Alloys

Front 99

Dislocation

Back 99

When a material is above it's yield strength dislocation motion occurs by sequential bonds breaking and forming.

Mechnism for permanent or plastic deformation of materials

Front 100

Grain boundaries occur in

Back 100

all polycrystalline materials (metals and ceramics)

Front 101

Polycrystals info

Back 101

Most engineering materials are polycrystals or poly crystalline