A 1-in-diameter (D = 1 inch) rotating machined shaft has a groove 0.1-in deep with a 0.1-in radiusmachined into it. The shaft is subjected to a pulsating (i.e. R = 0) torque and bending moment offollowing values. Based on laboratory experiments at 550°F, Sut = 150 ksi, Sy = 120 ksi, and S'e = 90ksi are measured. Using mod-Goodman equation and for operating temperature of 550°F and 90%reliability, determine the factor of safety for yielding and fatigue of this shaft.Tmax = 2000 Ib-inMmax = 1600 lb-inMmin = -1200 Ib-inD- -d-MTMT Q7. Consider water boiling in an Aluminium pan. The base surface of the pan is dissipating800 kW/m2 of heat flux. a) The pan is open to atmosphere. Estimate the diameter of the bubblesformed at the base surface of the pan and the characteristic velocity of fluid agitation. b) Nowthe pan is closed from top and connected to a vacuum pump such that the pressure in the panis reduced to 0.5 atm. How does your estimate for bubble diameter and fluid agitation velocitychange in this case. c) For case a, calculate the exact diameter of the bubble if the bubble canbe assumed to be hemispherical and the contact angle between water and aluminium is 60°.

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A 1-in-diameter (D = 1 inch) rotating machined shaft has a groove 0.1-in deep with a 0.1-in radius machined into it. The shaft is subjected to a pulsating (i.e. R = 0) torque and bending moment of following values. Based on laboratory experiments at 550°F, Sut = 150 ksi, S, = 120 ksi, and S'e = 90 ksi are measured. Using mod-Goodman equation and for operating temperature of 550°F and 90% reliability, determine the factor of safety for yielding and fatigue of this shaft. Tmax = 2000 lb-in Mmax = 1600 lb-in Mmin = -1200 Ib-in

A 1-in-diameter (D = 1 inch) rotating machined shaft has a groove 0.1-in deep with a 0.1-in radius machined into it. The shaft is subjected to a pulsating (i.e. R = 0) torque and bending moment of following values. Based on laboratory experiments at 550°F, Sut = 150 ksi, S, = 120 ksi, and S'e = 90 ksi are measured. Using mod-Goodman equation and for operating temperature of 550°F and 90% reliability, determine the factor of safety for yielding and fatigue of this shaft. Tmax = 2000 lb-in Mmax = 1600 lb-in Mmin = -1200 Ib-in

Elements Of Electromagnetics

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Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Concept explainers

Combined Loading

Any functioning component, such as machine parts, structural members, pressure vessels, and so on, are all under the influence of more than one force. When anybody is under the influence of more than one force such as shear forces, bending moments, axial forces, torsion, and so on, then such body is said to be under combined loading. A very practical example of combined loading is the crankshaft of an internal combustion engine (IC engine). The crankshaft of the IC engine is under high rpm, which is caused due to the torsional forces. Due to the presence of piston, counterbalances, and internal imbalances, the crankshaft experiences lateral forces and due to the rise in temperature, the crankshaft undergoes thermal expansion, which pulls the crankshaft along the axial direction and lateral direction. The presence of unbalanced loads along the periphery of the crankshaft also induces a bending moment.

Question

100%

A 1-in-diameter (D = 1 inch) rotating machined shaft has a groove 0.1-in deep with a 0.1-in radius
machined into it. The shaft is subjected to a pulsating (i.e. R = 0) torque and bending moment of
following values. Based on laboratory experiments at 550°F, Sut = 150 ksi, Sy = 120 ksi, and S'e = 90
ksi are measured. Using mod-Goodman equation and for operating temperature of 550°F and 90%
reliability, determine the factor of safety for yielding and fatigue of this shaft.
Tmax = 2000 Ib-in
Mmax = 1600 lb-in
Mmin = -1200 Ib-in
D
- -d-
M
T
M
T

Q7. Consider water boiling in an Aluminium pan. The base surface of the pan is dissipating
800 kW/m2 of heat flux. a) The pan is open to atmosphere. Estimate the diameter of the bubbles
formed at the base surface of the pan and the characteristic velocity of fluid agitation. b) Now
the pan is closed from top and connected to a vacuum pump such that the pressure in the pan
is reduced to 0.5 atm. How does your estimate for bubble diameter and fluid agitation velocity
change in this case. c) For case a, calculate the exact diameter of the bubble if the bubble can
be assumed to be hemispherical and the contact angle between water and aluminium is 60°.

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