Unit 7 - Creep Deformation

Question 1

Explain creep

Answer 1

a time dependent deformation under an applied load.
it generally occurs at high temperatures but can also happen at room temperature (occurs much slower)
materials undergoes a timed dependent increase in length

Question 2

Define creep

Answer 2

an increase in plastic strain under constant stress

Question 3

Define stress relaxation

Answer 3

is a decrease in stress under a constant strain

Question 4

Define primary creep

Answer 4

starts at a rapid rate and slows with time

Question 5

Define steady state creep

Answer 5

has a relatively uniform rate

Question 6

Define tertiary creep

Answer 6

had an accelerated creep rate and terminates when the material breaks or ruptures