Stress Analysis (Machine Design 1)

Question 1

a stress that is mainly due to a force applied to a machine member in which the resisting area is normal or perpendicular to the direction of the force.

Answer 1

Normal Stress

Question 2

a stress caused by a force in which the resisting area is parallel to the direction of the force

Answer 2

Shear Stress

Question 3

a type of compressive stress which involves two members in contact; also referred as contact stress.

Answer 3

Bearing Stress

Question 4

Every direct stress is accompanied by a strain in its own direction which is known as

Answer 4

linear strain

Question 5

an opposite kind of strain in every direction, at right angles to it, is known as

Answer 5

lateral strain

Question 6

It has been found experimentally that when a body is stressed within elastic limit, the lateral strain bears a constant ratio to the linear strain

Answer 6

Poisson’s Ratio

Question 7

When a body is subjected to two equal and opposite forces acting tangentially across the resisting section, as a result of which the body tends to shear off the section, then the stress induced is called

Answer 7

shear stress

Question 8

When a machine member is subjected to the action of two equal and opposite couples acting in parallel planes (or torque or twisting moment), then the machine member is said to be subjected to

Answer 8

torsion

Question 9

The stress set up by torsion is known as

Answer 9

torsional shear stress

Question 10

if the deformation of the body is prevented to occur due to
some restrictions, some stresses are induced in the body. Such stresses are known as ______________.

Answer 10

thermal stresses

Question 11

states that when a material is loaded within elastic limit, the stress is directly proportional to strain

Answer 11

Hooke’s Law

Question 12

It is defined as that stress at which the stress-strain curve
begins to deviate from the straight line.

Answer 12

A=proportional limit

Question 13

It is defined as the stress developed in the material without any permanent set.

Answer 13

B=elastic limit

Question 14

If the material is stressed beyond point B, the plastic stage will reach i.e. on the removal of the load, the material will not be able to recover its original size and shape.

Answer 14

C and D=upper and lower yield points

Question 15

The stress has attained its maximum value known as ultimate stress. It is defined as the largest stress obtained by dividing the largest value of the load reached in a test to the original cross-sectional area of the test piece

Answer 15

E= ultimate point

Question 16

After the specimen has reached the ultimate stress, a neck is formed, which decreases the cross-sectional area of the specimen. A little consideration will show that the stress (or load) necessary to break away the specimen, is less than the maximum stress. The stress is, therefore, reduced until the specimen breaks away at point F. The stress corresponding to point F is known as breaking stress.

Answer 16

F=breaking stress

Question 17

It is defined, in general, as the ratio of the maximum stress to the working stress.

Answer 17

Factor of Safety or Design Factor