Mechanical Properties

Question 1

These are most commonly conducted for metals at room temperature

Answer 1

Stress-strain test

Question 2

The three principal ways in which a load may be applied

Answer 2

Tension, Compression, and Shear

Question 3

A gradually increasing tensile force that is applied uniaxially along the long axis of the specimen

Answer 3

Tension

Question 4

A gradually increasing compressive force that is applied uniaxially along the long axis of a specimen

Answer 4

Compression

Question 5

A load or force imposed parallel to the upper and lower faces, each of which has an area of A0

Answer 5

Shear

Question 6

Is simply the instantaneous load applied over the cross sectional area before any load is applied

Answer 6

Engineering Stress

Question 7

Is simply the deformation elongation or change in length at some instance over the original length before load is applied

Answer 7

Engineering Strain

Question 8

Is always dimensionless

Answer 8

Strain

Question 9

The maximum stress on engineering stress-strain curve

Answer 9

Tensile Strength

Question 10

Also called as the ultimate strength

Answer 10

Fracture

Question 11

Acts as a stress concentrator

Answer 11

Neck

Question 12

In metals, this occurs when a noticeable necking starts

Answer 12

Tensile Strength

Question 13

In polymers, it occurs when polymer backbone chains are aligned and about to break

Answer 13

Tensile Strength

Question 14

Another term for the modulus of elasticity

Answer 14

Young’s Modulus

Question 15

Is the relationship between engineering stress and engineering strain for elastic deformation

Answer 15

Hooke’s Law

Question 16

Is deformation in which the stress and strain are proportional

Answer 16

Elastic Deformation

Question 17

What is represented by the ordinate in a stress-strain diagram?

Answer 17

Stress

Question 18

What is represented by the abscissa in a stress-strain diagram?

Answer 18

Strain

Question 19

May be thought of as stiffness, or a material’s resistance to elastic deformation

Answer 19

Modulus of Elasticity (E)

Question 20

Is nonpermanent, which means that when the applied load is released, the piece returns to its original shape

Answer 20

Elastic Deformation

Question 21

Corresponds to the slope of the linear portion of the stress-strain graph

Answer 21

Modulus of Elasticity (E)

Question 22

Is a time-dependent elastic behavior

Answer 22

Anelasticity

Question 23

It is the ratio of the lateral and axial strains

Answer 23

Poisson’s Ratio

Question 24

Occurs when stress is no longer proportional to strain which results to a deformation that is permanent and nonrecoverable

Answer 24

Plastic Deformation

Question 25

It is the stress level at which plastic deformation begins

Answer 25

Yielding

Question 26

Stress at which noticeable plastic deformation has occured

Answer 26

Yield Strength

Question 27

The stress corresponding to the intersection of this line and the stress-strain curve as it bends over in the plastic region

Answer 27

Yield Strength

Question 28

May be determined as the initial departure from linearity of the stress-strain curve

Answer 28

Proportional Limit

Question 29

It is a measure of the degree of plastic deformation that has been sustained at fracture

Answer 29

Ductility

Question 30

Refers to when a metal experiences very little or no plastic deformation upon fracture

Answer 30

Brittle

Question 31

Is the capacity of a material to absorb energy when it is deformed elastically and then, upon unloading, to have this energy recovered

Answer 31

Resilience

Question 32

Is the strain energy per unit volume required to stress a material from an unloaded state up to the point of yieding

Answer 32

Modulus of Resilience

Question 33

Ability of a material to store energy

Answer 33

Resilience

Question 34

Is a property that is indicative of a material's resistance to fracture when a crack is present

Answer 34

Toughness

Question 35

Is the ability of a material to absorb energy and plastically deform before fracturing

Answer 35

Toughness

Question 36

Energy to break a unit volume of material

Answer 36

Toughness

Question 37

Is defined as the load F divided by the instantaneous cross-sectional area over which deformation is occurring

Answer 37

True Stress

Question 38

Is defined when no volume occurs during deformation

Answer 38

True Strain

Question 39

Is a measure of a material's resistance to localized plastic deformation

Answer 39

Hardness

Question 40

Resistance to permanently indenting the surface

Answer 40

Hardness