Manufacturing - 13

In what terms, fatigue life is measured?

• Time of failures

• Number of cycles of failure

• Stress of failure

• Appearance of fracture

Fatigue curves are popularly known as __________ curves.

• S

• R

• N

• S-N

What term is used for the maximum stress at which material fail on a specified number of cycle?

• Fatigue strength

• Fatigue life

• Ultimate tensile strength

• Endurance limit

Which ferrous material doesn’t show fatigue limit?

• Cast iron

• Wrought iron

• Austenitic stainless steel

• Low carbon steel

What is the reason for fatigue failure?

• Movement of Dislocations

• Submicroscopic cracks

• Dynamic recovery

• Vacancy coalescence

Magnitude of compressive stress on the fatigue test specimen is ___ tensile stress magnitude.

• Equal to

• Greater than

• Lesser than

• Changes with weight

Which of the following is a slow rise of plastic deformation under the action of shear stresses when it is below the yield strength of the material?

• Brittle fracture

• Ductile fracture

• Creep

• Fatigue

Which of the following isn’t a stage of creep?

• Transient creep stage

• Constant creep stage

• Fracture stage

• Steady stage creep stage

Which of the following stage is also known as the unstable stage?

• Transient creep stage

• Constant creep stage

• Fracture stage

• Steady stage creep stage

Creep depends on temperature.

• True

• False