Qu2. (A) What is fatigue? Mention the sequence of steps involved in fatigue of a smooth specimen. Mention Four (4) factors that affect fatigue of smooth specimens, stating how each affects fatigue life

Elements Of Electromagnetics
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Qu2. (A) What is fatigue? Mention the sequence of steps involved in fatigue of a smooth
specimen. Mention Four (4) factors that affect fatigue of smooth specimens, stating how each
affects fatigue life
(B) A very wide panel made of a material of plane-strain fracture toughness of Kic=55MPaVm
was found to have a central crack of size 2.5mm. It is subjected to cyclic loading at a design
(or working) stress of 690MPA and stress ratio of zero.
(a)
Sketch the stress-time graph of the loading cycle and determine (i) Stress Range,
(ii) maximum cycle stress, (iii) stress amplitude and (iv) mean stress
(b)
Will the initial loading cycle cause the panel to fracture? Why or whynot?
Compute the maximum allowable fatigue flaw size that can fracture the panel
during the cyclic loading. (Assume that plain strain condition prevails).
(c)
Transcribed Image Text:Qu2. (A) What is fatigue? Mention the sequence of steps involved in fatigue of a smooth specimen. Mention Four (4) factors that affect fatigue of smooth specimens, stating how each affects fatigue life (B) A very wide panel made of a material of plane-strain fracture toughness of Kic=55MPaVm was found to have a central crack of size 2.5mm. It is subjected to cyclic loading at a design (or working) stress of 690MPA and stress ratio of zero. (a) Sketch the stress-time graph of the loading cycle and determine (i) Stress Range, (ii) maximum cycle stress, (iii) stress amplitude and (iv) mean stress (b) Will the initial loading cycle cause the panel to fracture? Why or whynot? Compute the maximum allowable fatigue flaw size that can fracture the panel during the cyclic loading. (Assume that plain strain condition prevails). (c)
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