An infinite plate have a centre-crack having an initial crack of length 2ao = 8 mm isundergoing a constant amplitude cyclic tensile stress ranging between a minimumvalue of 180 MPa and a maximum of 350 MPa. Assuming the fatigue crack growthrate is governed by the equation,dadN=0.42 × 10-¹¹(AK)³ (m/cycle)11(i). At what crack length the plate will fracture(ii). Explain the properties of Fatigue. Also, explain with sketches the threephases of crack propagation due to cyclic loading in a material.(iii). Explain the factors that can improve the Fatigue strength of a machinecomponent.

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An infinite plate have a centre-crack having an initial crack of length 2ao = 8 mm is undergoing a constant amplitude cyclic tensile stress ranging between a minimum value of 180 MPa and a maximum of 350 MPa. Assuming the fatigue crack growth rate is governed by the equation, da dN = 0.42 × 10-¹¹(AK)³ (m/cycle) (i). At what crack length the plate will fracture (ii). Explain the properties of Fatigue. Also, explain with sketches the three phases of crack propagation due to cyclic loading in a material. (iii). Explain the factors that can improve the Fatigue strength of a machine component.

An infinite plate have a centre-crack having an initial crack of length 2ao = 8 mm is undergoing a constant amplitude cyclic tensile stress ranging between a minimum value of 180 MPa and a maximum of 350 MPa. Assuming the fatigue crack growth rate is governed by the equation, da dN = 0.42 × 10-¹¹(AK)³ (m/cycle) (i). At what crack length the plate will fracture (ii). Explain the properties of Fatigue. Also, explain with sketches the three phases of crack propagation due to cyclic loading in a material. (iii). Explain the factors that can improve the Fatigue strength of a machine component.

Elements Of Electromagnetics

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Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Thermal Properties of Materials

In mechanical engineering, the thermal property is represented as the physical quantity that is relevant to the application of heat. The thermal properties are evaluated by variations in any specific material due to low heat or high heat. The quantities that influence the thermal property of the materials are mass, density, temperature, and many others.

Question

An infinite plate have a centre-crack having an initial crack of length 2ao = 8 mm is
undergoing a constant amplitude cyclic tensile stress ranging between a minimum
value of 180 MPa and a maximum of 350 MPa. Assuming the fatigue crack growth
rate is governed by the equation,
da
dN
=
0.42 × 10-¹¹(AK)³ (m/cycle)
11
(i). At what crack length the plate will fracture
(ii). Explain the properties of Fatigue. Also, explain with sketches the three
phases of crack propagation due to cyclic loading in a material.
(iii). Explain the factors that can improve the Fatigue strength of a machine
component.

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