Properties of Materials

Question 1

What are the engineering materials?

Answer 1

● metals
● polymers
● elastomers
● ceramics
● glasses
● hybrids

Question 2

Matter in latin

Answer 2

mater

Question 3

matter in sanskrit

Answer 3

matri

Question 4

matter means

Answer 4

mother

Question 5

Materials

Answer 5

Matter that human beings use and/or process.

All matter that is used to produce manufactured or consumer goods.

Question 6

classification of the properties of materials

Answer 6

Thermal
Optical
Mechanical
Physical
Chemical
Nuclear

Question 7

PHYSICAL TERMS OF DESCRIBING PROPERTIES OF MATERIALS

Answer 7

Hardness
Toughness
Malleability
Ductility
Elasticity
Plasticity
Strengthen
Stiffness
Density
Fusibility
Conductivity
Brittleness
Contraction and Expansion

Question 8

Heat-treatment terms

Answer 8

Critical Range
Annealing
Normalizing
Heat Treatment
Hardening
Quenching
Tempering
Carburizing
Casehardening

Question 9

Physical Test Terms

Answer 9

Strain
Stress
Tensile Strength
Elastic Limit
Proportional Limit
Proof Stress
Yield Strength
Yield Point
Elongation
Reduction of Area
Modulus Elasticity

Question 10

What is the property of resisting penetration or permanent distortion. Can be measured by Hardness mohs scale?

Answer 10

Hardness

Question 11

What is ability of a material to withstand cracks to prevent the transfer or propagation of cracks across its section hence causing failure? Ability to absorb impact well. (Nm or Joule)

Answer 11

Toughness

Question 12

What is the property of metals which allows them to be bent or permanently distorted without rupture (compressive stress)?

Answer 12

Malleability

Question 13

What is the property of metals which allows them to be drawn out without breaking (tensile stress)?

Answer 13

Ductility

Question 14

What is the property of returning to the original shape when the force causing the change of shape is removed?

Answer 14

Elasticity

Question 15

Opposite of elasticity. The ability of a material to be changed in shape permanently.

Answer 15

Plasticity

Question 16

the ability of a material to resist applied stress before failure without deformation. More on the physical.

Answer 16

Strength

Question 17

resistance to elastic deformation or the ability to resist bending. More on the functional.

Answer 17

Stiffness

Question 18

What is the weight of a unit volume of the material?

Answer 18

Density

Question 19

What is the property of being liquefied by heat. Metals are fused in welding. Steels fuse around 2500°F, aluminum alloys around 1100°F?

Answer 19

Fusibility

Question 20

what is the property of transmitting heat or electricity?

Answer 20

conductivity

Question 21

what is the property of resisting a change in the relative
position of molecules, or the tendency to fracture without change of shape?

Answer 21

Brittleness

Question 22

What are caused by the cooling or heating of metals.

Answer 22

Contraction and Expansion

Question 23

applied to steel, refers to the range of temperature between 1300°F and 1600°F?

Answer 23

Critical Range

Question 24

what is the process of heating steel above the critical range, holding it at that temperature until it is uniformly heated and the grain is refined, and then cooling it very slowly?

Answer 24

Annealing

Question 25

what is similar to annealing, but the steel is allowed to cool in still air - a method that is somewhat faster than annealing cooling?

Answer 25

Normalizing

Question 26

what consists of a series of operations which have as their aim the improvement of the physical properties of a material?

Answer 26

Heat treatment

Question 27

______ of steel is done by heating the metal to a temperature above the critical range and then quenching it?

Answer 27

Hardening

Question 28

What is the immersion of the heated metal in a liquid, usually either oil or water to accelerate its cooling?

Answer 28

Quenching

Question 29

Sometimes referred to as “drawing”, is the reheating of hardened steel to a temperature below the critical range, followed by cooling as desired.

Answer 29

Tempering

Question 30

What is the addition of carbon to steel by heating it at a high temperature while in contact with a carbonaceous material in either solid, liquid, or gaseous form?

Answer 30

Carburizing

Question 31

What consists of carburizing, followed by suitable heat treatment to harden the metal?

Answer 31

Casehardening

Question 32

What is the deformation of material caused by an applied load?

Answer 32

Strain

Question 33

What is the load acting on a material. Internal stresses are the loads present in a material that has been strained by cold-working?

Answer 33

Stress

Question 34

This is often referred to as the ultimate tensile strength (U.T.S.). lt is the maximum tensile load per square inch which a material can withstand.

Answer 34

Tensile Strength

Question 35

What is the greatest load per square inch of original cross-sectional area which a material can withstand without a permanent deformation remaining upon complete release of the load.

Answer 35

Elastic Limit

Question 36

What is the load per square inch a material can withstand without resulting in a permanent elongation of more than 0.0001 inch per inch of gage length after complete release of stress?

Answer 36

Proof Stress

Question 37

What is the load per square inch at which a material exhibits a specified limiting permanent set or a specified elongation under load?

Answer 37

Yield Strength

Question 38

What is the load per square inch at which there occurs a marked increase in deformation without an increase in load?

Answer 38

Yield Point

Question 39

What is the difference in gage length before being subjected to any stress and after rupture, expressed in percentage of the original gage length?

Answer 39

Elongation (Percentage)

Question 40

What is the difference between the original cross-sectional area and the least cross- sectional area after rupture, expressed as a percentage of the original cross- sectional area?

Answer 40

Reduction of Area (Percentage)

Question 41

What is the ratio of stress to strain within the elastic limit. Thus E= unit stress/unit strain?

Answer 41

Modulus of Elasticity