Qu2. (A) What is fatigue? Mention the sequence of steps involved in fatigue of a smoothspecimen. Mention Four (4) factors that affect fatigue of smooth specimens, stating how eachaffects fatigue life(B) A very wide panel made of a material of plane-strain fracture toughness of Kic=55MPaVmwas 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 panelduring the cyclic loading. (Assume that plain strain condition prevails).(c)

When material is subjected to repeated stress, it fails at stress below the yield point stress. This…

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

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

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Torsion

In mechanical engineering, torque, torsion, and twisting moment are three of the most important concepts which have different meanings. Torque is the consequence of a moment of a force that produces an angular acceleration in a body or induces rotational kinetic energy in a body. For instance, in an automobile, the power transmission shaft is a body that is always under rotation due to the external torque acting on it, this torque is created by the engine.

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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)

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