modb terms

Question 1

Deals with the equilibrium of bodies, those at rest or move with a
constant velocity.

Answer 1

Statics

Question 2

is concerned with the accelerated motion of bodies

Answer 2

Dynamics

Question 3

deals with the relations between externally applied loads
and their internal effects of the bodies. The bodies here are no longer rigid
instead it will experience deformation.

Answer 3

Strength of Materials

Question 4

page 7 review

Answer 4

page 7 review

Question 5

This component measures
the pulling (or pushing) action perpendicular to
the section. It is often denoted by P.

Answer 5

Px
AXIAL FORCE.

Question 6

These are the
components of the total resistance to sliding
portion to one side of the exploratory section
past the other.

Answer 6

Py
, Pz SHEAR FORCES.

Question 7

is usually
designated by V and its components by Vy

and

Vz
to identify their directions.

Answer 7

resultant force

Question 8

This component measures the
resistance to twisting the member and is
commonly given the symbol T.

Answer 8

Mx
TORQUE.

Question 9

These
components measure the resistance to bending
the member about y- or z- axis and are often
denoted merely by My or Mz
.

Answer 9

My
, Mz BENDING MOMENTS.

Question 10

is the force per unit area and denoted
by the Greek letter σ (sigma).

Answer 10

Stress

Question 11

indicates a tensile stress
(member in tension),

Answer 11

A positive sign

Question 12

indicates a compressive stress (member in
compression).

Answer 12

a negative sign

Question 13

The condition under which the stress is
constant or uniform is known as

Answer 13

simple stress.

Question 14

can exist only if
the resultant of the applied loads passes
through the centroid of the cross-section.

Answer 14

A uniform stress distribution

Question 15

-When applied loads cause one piece of a body to move beyond its
neighboring section,
-it is created
by forces operating parallel to or along the area resisting the forces,
-are referred to as tangential
stresses.
*Stress caused by shearing force (e.g. bolts, pins, rivets)
*Acts tangent or parallel to the resisting surface
*Results in shape change

Answer 15

SHEAR STRESS

Question 16

are caused by forces acting perpendicular to the
areas on which they operate.
-often referred
to as normal stresses,

Answer 16

Tensile and compressive stresses

Question 17

is denoted by Greek letter Tau (τ)
τ =V/A

Answer 17

Shearing stress

Question 18

known as unit deformation, strain is the ratio of the change in length caused
by the applied force, to the original length.
where δ is the deformation and L is the original length, thus ε is dimensionless.

Answer 18

SIMPLE STRAIN

Question 19

Contact Pressure between separate bodies
* Differs from normal stress which is the internal stress caused by a compressive
force.
* Examples: Soil pressure beneath a support, contact pressure between a rivet
and the side of its hole

Answer 19

BEARING STRESS

Question 20

is a geometric quantity that measures the deformation of
a body.

Answer 20

strain

Question 21

which characterizes
dimensional changes,

Answer 21

normal strain,

Question 22

which describes distortion

Answer 22

shear strain,

Question 23

the stress-strain diagram is a straight line
from the origin O to a point

Answer 23

proportional limit.

Question 24

is a material property known as the modulus of elasticity or Young’s
modulus.

Answer 24

E

Question 25

the stress beyond which the material is no longer elastic.

Answer 25

elastic limit

Question 26

The permanent deformation that remains after the removal of the load is called

Answer 26

permanent set.

Question 27

The point where the stress-strain diagram becomes almost horizontal is called

Answer 27

yield point,

Question 28

the highest stress on the stress-strain curve.

Answer 28

Ultimate Stress

Question 29

is the stress at which failure occurs.

Answer 29

rupture stress

Question 30

is also known as working stresses. It is the maximum safe stress a material can carry.

Answer 30

Allowable stress

Question 31

Increase in temperature results in expansion, while decrease in temperature results to contraction.

Answer 31

THERMAL STRAIN

Question 32

is internal stress in an object caused by temperature changes, which make it expand or contract.

Answer 32

THERMAL STRESS

Question 33

Moment that tends to twist a member about its longitudinal axis; Also known as Twisting Moment,

Answer 33

TORQUE

Question 34

is the ratio of the transverse strain to the axial strain is constant for stresses within the proportional limit

Answer 34

Poisson’s

Question 35

is the deformation of the body due to changes in temperature

Answer 35

Thermal strain

Question 36

is a stress developed from the applied torque

Answer 36

Torsion

Question 37

are a tank or pipe carrying a fluid or gas under a pressure is subjected to tensile forces, which resist bursting.

Answer 37

Pressure vessels

Question 38

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

Answer 38

Strain