Q.1
The number of slip band in the fatigue is directly proportional to the number of cycles.
  • a) True
  • b) False
Q.2
The fatigue crack propagation is _____________ in nature.
  • a) intergranular
  • b) transgranular
  • c) along the high atomic density planes
  • d) along the low-density atomic planes
Q.3
The fatigue strain does not cause considerable strain hardening of successive cycle with growth of cracks.
  • a) True
  • b) False
Q.4
The plastic blunting process is the growth mechanism of crack, followed by the ___________
  • a) first stage of crack growth
  • b) second stage of the crack growth
  • c) third stage of the crack growth
  • d) termination of the crack
Q.5
With decrease in the temperature, the fatigue strength of the material ___________
  • a) decreases
  • b) increases
  • c) remains constant
  • d) no relationship
Q.6
The crack propagation rate with stress is given as ______
  • a) da/dN = C σam an
  • b) da/dN = C σmm an
  • c) da/dN = C σa a
  • d) da/dN = σa a
Q.7
The relationship between the stress intensity factor and crack growth is given as _______
  • a) da/dN = A (ΔK)
  • b) da/dN = A (ΔK)p
  • c) da/dN = (ΔK)
  • d) da/dN = A (1/ΔK)p
Q.8
Increasing the mean stress ___________ the crack growth rate.
  • a) increases
  • b) decreases
  • c) does not change
  • d) no relationship
Q.9
The correct graph to show the relationship between the crack growth rate (da/dN) vs stress intensity factor range (ΔK) is shown in the figure ________
Questionmechanical-metallurgy-questions-answers9.jpg
  • a)
  • b)
  • c)
  • d)
Q.10
In the given curve, the slope of the middle linear portion is equal to _________
  • a) da/dN
  • b) ΔK
  • c) A
  • d) p
0 h : 0 m : 1 s