CH 1

Question 1

Elastic deformation

Answer 1

Reversible or temporary change in shape under applied force.

Question 2

Plastic deformation

Answer 2

Change in shape under applied force.

Question 3

Ductile fracture

Answer 3

Preceded by considerable plastic deformation.

Question 4

Brittle fracture

Answer 4

Occurs with little or no plastic deformation.

Question 5

Stress

Answer 5

Is the intensity of a force on a specified area.

Question 6

Strength

Answer 6

Is the capacity of a material to resist deformation or fracture.

Question 7

Yield strength

Answer 7

Is the stress above which a material begins to deform permanently.

Question 8

Ultimate tensile strength

Answer 8

Is the maximum stress a material can withstand without fracture.

Question 9

Ductility

Answer 9

Is the capacity of a material to undergo plastic deformation.

Question 10

Brittle

Answer 10

Little to no plastic deformation.

Question 11

Stiffness

Answer 11

Ability of a material to resist deformation.

Question 12

Toughness

Answer 12

The capacity of a material to resist fracture.

Question 13

Impact toughness

Answer 13

The capacity of a material to absorb impact or shock loading.

Question 14

Resilience

Answer 14

Is the ability to absorb energy during elastic deformation.

Question 15

Hardness

Answer 15

Is the capacity of a material to resist penetration.

Question 16

Fusability

Answer 16

Is the ease with which a material melts.

Question 17

Density

Answer 17

The mass of a material per unit volume.

Question 18

Electrical conductivity

Answer 18

Is the ability of a material to transmit electrical charge.

Question 19

Thermal conductivity

Answer 19

Refers to the ability of a material to transfer heat.

Question 20

Thermal expansion

Answer 20

Refers to the tendency of a material to deform in response to heat.

Question 21

Corrosion resistance

Answer 21

Is the ability of a material to resist reacting with its surroundings.

Question 22

Corrosion

Answer 22

Is the chemical reaction of a material with its environment.

Question 23

Toxicity

Answer 23

Refers to the tendency of a material to damage or harm living organisms.

Question 24

Biocompatibility

Answer 24

Ability of a material implanted in a human body to function without eliciting inflammatory response, allergic reaction or rejection by surrounding tissue.

Question 25

Alloy

Answer 25

Is a metal made by combining 2 or more metals.

Question 26

Intermetallics

Answer 26

Are formed when two or more metals react to form a compound.

Question 27

Composites

Answer 27

Composites are made by physically blending two or more materials

Question 28

Buckling failure

Answer 28

Is excessive elastic deformation observed on structures that are longer than they are wide and subjected to compressive loads along the longest dimension.

Question 29

Creep

Answer 29

Is the plastic deformation of a material under stress at temperatures higher than room temperature.

Question 30

Fracture

Answer 30

Is complete separation of a material under the action of stress.

Question 31

Fatigue

Answer 31

Is the progressive fracture of a material under repetitive stress.

Question 32

Stress rupture

Answer 32

Fracture that occurs when a material is subjected to a constant load at high temperatures for a long time.

Question 33

Abrasive wear

Answer 33

Occurs when material is removed from a surface by hard particles or by hard protuberances on other surface moving relatively to it.

Question 34

Adhesive wear

Answer 34

Occurs when material is removed from surfaces that move relative to each other under pressure.

Question 35

Thermoset

Answer 35

The polymers are cross linked to one another to form a three dimensional network.

Question 36

Thermo plastics

Answer 36

Consist of loosely connected polymers.

Question 37

Elastomers

Answer 37

These are made of spring like chain molecules.