Fatigue:
Failure of
materials under repeated or reversal stress is called Fatigue.
The
maximum stress at which the material will operate indefinitely without failure
is known as endurance
limit or Fatigue limit.
Creep:
The slow and
progressive deformation of a material with time at constant stress is called
creep.
The
ability of material to prevent such deformation usually at high temperature is
called creep resistance.
