Stress and Strain

What is zone A called?

• Plastic zone

• Elastic zone

• Brittle zone

What kind of behavior is exhibited in point D?

• Elastic

• Plastic

• Brittle

What happens in point E?

• Plastic limit

• Elastic limit

• Brittle failure

A nylon string has a diameter of 2 mm, pulled by a force of 100 N. Determine the stress.

• 2.35 x 10⁷ N/m²

• 3.15 x 10⁷ N/m²

• 4.15 x 10⁷ N/m²

A string has a diameter of 1 cm and the original length of 2 m. The string is pulled by a force of 200 N. Determine the change in length of the string. Young’s modulus of the string is 5 x 10⁹ N/m²

• 0.42 m

• 0.33 m

• 0.26 m

• 0.18 m

Which of these factors does NOT affect the stress of a wire?

• diameter

• original length

• load

• cross sectional area

What is the unit for stress?

• N/m³

• N*m³

• N*m²

• N/m²

Greater the angle of inclination of the stress strain curve less is the elasticity.

• True

• False

It is expressed as the ratio of the applied force divided by the resisting area.

• elongation

• stress

• strain

• tensile strength

The amount of deformation in the direction of the applied force divided by the initial length of the material.

• Stress

• Strain

• Pascals

• Force