6. A 2.5 in.-diameter steel propeller shaft of a boat transmits 2800 hp @ 1800 rpm. Bending and axial loads are negligible. Clearly draw and label necessary schematic diagrams and list necessary assumptions. (a) What is the shear stress at the surface of shaft? (b) If a hollow shaft of inside diameter 0.88 times outside diameter is used, what outside diameter would be required to give the same outer surface stress? (c) Compare weights of the solid and hollow shafts. What is % saving in weight of shaft material if hollow shaft is used? (d) As a design engineer, what important lesson have you learned from solving this this? (e) What is Polar Moment of Inertia?

6. A 2.5 in.-diameter steel propeller shaft of a boat transmits 2800 hp @ 1800 rpm. Bending and axial loads are negligible. Clearly draw and label necessary schematic diagrams and list necessary assumptions. (a) What is the shear stress at the surface of shaft? (b) If a hollow shaft of inside diameter 0.88 times outside diameter is used, what outside diameter would be required to give the same outer surface stress? (c) Compare weights of the solid and hollow shafts. What is % saving in weight of shaft material if hollow shaft is used? (d) As a design engineer, what important lesson have you learned from solving this this? (e) What is Polar Moment of Inertia?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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The steel alloy shaft having a diameter of 38 mm is used to transmit torque, T as shown in Figure Q2(c ). If the allowable shear stress of the shaft is 81kPa (i) Determine the maximum torque T that can be transmitted by the shaft. (ii) What would be the maximum torque T' if a 25 mm diameter hole is bored through the shaft? (iii) Sketch the shear-stress distribution along a radial line in each case. T T' Figure Q2(c)
Maximum shear stress developed on the surface of a solid circular shaft under pure torsion is 240 MPa. If the shaft diameter is doubled, then what is the maximum shear stress developed corresponding to the torque?
The impeller shaft of a fluid agitator transmits 25 kW at 450 rpm. If the allowable shear stress in the impeller shaft must be limited to 85 MPa, determine (a) the minimum diameter required for a solid impeller shaft. (b) the maximum inside diameter permitted for a hollow impeller shaft if the outside diameter is 34 mm. (c) the percent savings in weight realized if the hollow shaft is used instead of the solid shaft. (Hint: The weight of a shaft is proportional to its cross-sectional area.) Answers: (a) Dmin mm (b) dmax = Jmm (c) Percent Weight Savings !! %
I need answer within 5 minutes please please with my best wishes
(7) The shaft shown is machined from C1040, OQT (oil-quenched treatment) @ 1,000°F. It is subjected to a torque that varies from zero to 10,000in-lb. (F = 0). Let r = 0.2D and N = 2. (a) Compute D. (b) What is the maximum torsional stress in the shaft?
Submit correct and complete solutions. give propriate Explanation. Provide step-by-step detailed explanations.
Question 3 A hollow shaft for marine applications has outer and inner diameters of 400 mm and 200 mm respectively and transmits 8000 kW at 100 r/min. 3.1 Calculate the maximum shear stress in the hollow shaft. /4/ 3.2 Calculate the shear stress on the inner surface of the hollow shaft. /2/ an 3.3 Determine the maximum length of this shaft if the maximum shear stress as well angle of twist of 30 is not to be exceeded. (G = 80 GPa) /3/ 3.4 If this shaft is connected to a similar shaft, 1 m long, through a 10-bolt rigid flange coupling, determine the minimum standard bolt diameter if the pitch circle diameter of the coupling is pcd = 450 mm and the allowable shear stress in the bolts should not exceed 55 MPa. /3/ 3.5 Determine the equivalent torsional stiffness of the shaft assembly. /3/ [15]
The steel alloy shaft having a diameter of 38 mm is used to transmit torque, T as shown in Figure Q2(c). If the allowable shear stress of the shaft is 88kPa (i) Determine the maximum torque T that can be transmitted by the shaft. (ii) What would be the maximum torque T' if a 25 mm diameter hole is bored through the shaft? (iii) Sketch the shear-stress distribution along a radial line in each case. T Figure Q2(c)
PLEASE ANSWER ALL OF THIS QUESTION ASAP!!!
Could you answer quickly pls? ( course: strength of materials 1)
8.9 (A/B). A solid steel shaft of 200 mm diameter transmits 5 MW at 500 rev/min. It is proposed to alter the horsepower to 7 MW and the speed to 440 rev/min and to replace the solid shaft by a hollow shaft made of the same type of steel but having only 80% of the weight of the solid shaft. The length of both shafts is the same and the hollow shaft is to have the same maximum shear stress as the solid shaft. Find: (a) the ratio between the torque per unit angle of twist per metre for the two shafts; (b) the external and internal diameters for the hollow shaft. [L.Mech.E.] [2.085; 261, 190 mm.]
2-Falcon company Nizwa is conducting a campus interview to you. You are asked to design the propeller shaft with the following specification. (i) power tranmission = 230 kW(ii) speed = 80 rpm,(iii) Maximum shear stress = 60 MPa(iv) diameter ratio = 1.74(v) The maximum value of the twisting moment is 40% greater than its mean. (i) The mean torque is (Unit is in Nm)=__________ (ii) The maximum torque is (Unit is in Nm)=__________ (iii) The outer diameter of the shaft (unit in mm)=_______________ (iv) The inner diameter of the shaft (unit in mm)=_______________