ES2_Strength of Materials, Strain and Hooke's Law, Centroid, MOI, Radius of Gyration, Shear and Moment in Beams

Question 1

It is the study of the internal effect of external forces applied to structural members

Answer 1

Strength of Materials

Question 2

It is also known as Mechanics of Materials

Answer 2

Strength of Materials

Question 3

Internal loads cause _____ in a body/material

Answer 3

stress

Question 4

Stresses cause a body to ______ .

Answer 4

deform

Question 5

SI Units for Stress

Answer 5

N/mm^2, MN/m^2 or MPA

Question 6

Strength of a material per unit area

Answer 6

Stress

Question 7

English unit for stress

Answer 7

lb/in^2

Question 8

The lead to accurately describe and predict the elastic deformation of a body.

Answer 8

Stress

Question 9

3 Classifications of Stress

Answer 9

Normal Stress, Shear Stress, Bearing Stress

Question 10

Normal stress develops when a force is applied _______________ to the cross-sectional area of the material

Answer 10

perpendicular

Question 11

Shear stress is developed if the applied force is _________ to the resisting area.

Answer 11

parallel

Question 12

Other name for shear stress

Answer 12

tangential stress

Question 13

The contact pressure between separate bodies.

Answer 13

Bearing Stress

Question 14

Bearing stress differs from compressive stress, as it is an ______________ caused by compressive forces.

Answer 14

internal stress

Question 15

The ratio of the change in length caused by the applied force, to the original length.

Answer 15

Strain

Question 16

Strain is also known as __________

Answer 16

unit deformation

Question 17

The graph of these quantities with the stress σ along the y-axis and the strain ε along the x-axis is called the ________________.

Answer 17

stress-strain diagram

Question 18

The linear relation between elongation and the applied axial force was first noticed by Sir Robert Hooke in 1678 and is called _____________.

Answer 18

Hooke’s Law

Question 19

The constant of proportionality 𝑘 is called the ________________ and is equal to the slope of the stress-strain diagram from O to P.

Answer 19

Modulus of Elasticity 𝑬

Question 20

The limit beyond which the material will no longer go back to its original shape when the load is removed,

Answer 20

elastic limit

Question 21

The point at which the material will have an appreciable elongation or yielding without any increase in load.

Answer 21

Yield point

Question 22

The maximum ordinate in the stress-strain
diagram.

Answer 22

Ultimate strength

Question 23

It is the breaking strength wherein it refers to
the strength of the material just before it
ruptures/breaks.

Answer 23

Rupture strength

Question 24

It is defined as the actual stress of a material under a given loading.

Answer 24

Working stress

Question 25

The maximum safe stress that a material can carry

Answer 25

allowable stress

Question 26

The allowable stress should be limited to values not exceeding the ________________ .

Answer 26

proportional limit

Question 27

Since proportional limit is difficult to determine accurately, the allowable stress is taken as either the _____________ divided by a factor of safety

Answer 27

yield point or ultimate strength

Question 28

Ratio of strength to allowable strength is called _______________

Answer 28

factor of safety

Question 29

The point in which the region will be perfectly balanced horizontally if suspended from that point.

Answer 29

center of gravity or centroid

Question 30

Also called the second moment of area, is the product of area and the square of its moment arm about a reference axis.

Answer 30

Moment of inertia

Question 31

the moment of inertia about the z-axis.

Answer 31

Polar moment of inertia

Question 32

The distance from an axis at which the mass of a body may be assumed to be concentrated.

Answer 32

Radius of Gyration

Question 33

A slender structural member designed to support loads applied at various points perpendicular to their longitudinal axis.

Answer 33

Beam

Question 34

According to determinacy, a beam may be ____________ or __________

Answer 34

determinate or indeterminate.

Question 35

Beams in which the reactions of the supports may be determined using the equations of static equilibrium (3 available equations)

Answer 35

Statically determinate

Question 36

If the number of reactions exerted upon a beam exceeds the number of equations in static equilibrium, the beam

Answer 36

statically indeterminate

Question 37

Stresses caused by the bending moment are known as flexural or bending stresses.

Answer 37

Flexure Formula

Question 38

Stresses caused by the bending moment

Answer 38

flexural or bending stresses

Question 39

stress is proportional to the distance 𝑦 from the ________________.

Answer 39

neutral axis (N.A.)