3. The propeller of a fishing boat is rigidly connected to a 3.8-cm. driveshaft through a 0.95- cm diameter steel bolt. The bolt was designed to shear/break when the shear stress caused by hitting an underwater debris or obstruction reaches 180 MPa. Determine the contact force on the propeller blade (upon hitting a debris or obstruction) that will cause the bolt to shear/break. Assume the contact point of the debris or obstruction on the blade is 10- cm from the center of the propeller. Contact point of debris or obstruction Fc Fs- shearing force Fc- contact force T- torque Bolt 10 cm Driveshaft -Fs Fs

3. The propeller of a fishing boat is rigidly connected to a 3.8-cm. driveshaft through a 0.95- cm diameter steel bolt. The bolt was designed to shear/break when the shear stress caused by hitting an underwater debris or obstruction reaches 180 MPa. Determine the contact force on the propeller blade (upon hitting a debris or obstruction) that will cause the bolt to shear/break. Assume the contact point of the debris or obstruction on the blade is 10- cm from the center of the propeller. Contact point of debris or obstruction Fc Fs- shearing force Fc- contact force T- torque Bolt 10 cm Driveshaft -Fs Fs

Mechanics of Materials (MindTap Course List)

9th Edition

ISBN:9781337093347

Author:Barry J. Goodno, James M. Gere

Publisher:Barry J. Goodno, James M. Gere

Chapter3: Torsion

Section: Chapter Questions

Problem 3.3.12P: A propeller shaft for a small yacht is made of a solid steel bar 104 mm in diameter. The allowable...

See similar textbooks

Similar questions

A hollow steel shaft of length 1.75 m transmits 2000 kW of power at a speed of150 rev/min. The inside diameter is to be 0.75 times the outside diameter. Themaximum allowable torsional shear stress for the steel is 130 MN/m2and themodulus of rigidity (G) for the steel is 83 GN/m2. Given that a factor of safety of2 is required for the shaft, determine:i) the torque acting on the shaft;ii) the required external and internal diameters for the shaft; iii) the torsional shear stress set-up in the shaft material at the inside surfaceof the hollow shaft, and sketch the stress distribution through the shaftwall;iv) the angle of twist (in degrees) due to the torque.
A flanged bolt coupling consists of 20-mm aluminum bolts evenly spaced around a bolt circle 30 cm diameter and 12-mm steel bolts on a concentric bolt circle 20 cm in diameter. The allowable shearing stresses are 42 MPa in the aluminum and 62 MPa in the steel. What should be the minimum number of aluminum bolts if there are four steel bolts and the power applied is 760 kW at 600 rpm? Use Gal = 28 GPa and Gst = 83 GPa.
2. A Cast iron shaft transmits 30kW at 300 rpm. It carries a central load of 1000N and is simply supported between the bearings 3 meters apart. Determine the size of the shaft, if the allowable shear stress is 50MPa and the maximum tensile or compressive stress is not to exceed 60MPa.
1. A flanged bolt coupling consists of 20-mm aluminum bolts evenly spaced around a bolt circle 30 cm diameter and 12-mm steel bolts on a concentric bolt circle 20 cm in diameter. The allowable shearing stresses are 42 MPa in the aluminum and 62 MPa in the steel. What should be the minimum number of aluminum bolts if there are four steel bolts and the power applied is 760 kW at 600 rpm? Use Gal = 28 GPa and Gst = 83 GPa. 2. A torque of 1880 lb-ft is applied to the tube that has an elliptical shape with major and minor outside diameters of 6 in. and 3 in., respectively. Determine the minimum wall thickness so as not to exceed a shear stress of 8 ksi. Kindly answer please. I need ASAP thank you
If the internal torque experienced by a hollow brass shaft (G = 39 GPa) at a section with diameter d = 100 mm with 3 mm thick walls is T = 12 kNm, which of the following is closest to %3D the magnitude of the minimum shear stress developed on that section? Select one: O A. 262 MPa O B. 501 MPa O C. 279 MPa O D. 533 MPa
A solid shaft in a rolling mill transmits 20 kW at 2 revolutions per second. The length of the shaft is 3 m and modulus of rigidity is 83,000 MPa. Which of the following gives the torque carried by the shaft?a. 1.59 kN-m c. 2.69 kN-mb. 3.45 kN-m d. 4.81 kN-m Which of the following gives the minimum diameter so that the allowable torsional shearing of 40 MPa will not beexceeded?a. 88 mm c. 59 mmb. 45 mm d. 76 mm Which of the following gives the minimum diameter so that the allowable angle of twist of 6O will not be exceeded?a. 29 mm c. 35 mmb. 49 mm d. 55 mm
A motor is driving a solid circular steel shaft transmits 40kW of power at 500 rpm. If the diameter of the shaft is 40 mm, The maximum shear stress in the shaft is
A flange coupling connects two shafts to transmit 40 kW at 900 rpm. The flanges of the coupling are fastened by 6 bolts of the same material. The bolts are equally spaced around the circumference of the bolt circle. The arc on the bolt circle between two adjacent bolts measures approximately 52.36 mm. Find the size of the bolts if the allowable shear stress for the bolt material is 30 MPa.
A muff coupling connects two shafts to transmit a torque of 135.6 N-m, the diameter of the shaft is 25 mm. If the shaft and the key are produce out of same material, the value of allowable shear strength of the shaft material is . N/mm? O 442.06 44.21 O 30.65 O 4.42 A process vessel shaft is coupled to the differential box shaft of diameter 30mm. If the allowable shear stress of the shaft material and the coupling is 57 MPa. The value of Maximum torque that it can transmit in N-mm is, a. 296328.75 O b. 302028.75 O c. 307728.75 O d. 1208115.00
A drilling riser is used to drill a 4km deep hole into the seabed. The riser can be approximated as a hollow steel shaft of 185mm and 160mm outer and inner diameter respectively. If the power exerted is 230kW and the speed of rotation of the drill is 75RPM, calculate the maximum shear stress in the shaft and the twist of one end relative to the other in degrees.(Note the angle of twist of a 4km drill string is going to be >> 360o ) G = 89 kN/mm2
Q3/ An open belt drive connected two parallel shafts 1.2 m apart. The driving and driven shafts rotate at 350 rpm and 140 rpm respectively and the driven pulley is 40 cm diameter. The belt is 5 mm thick and 8 cm wide. u = 0.3 and maximum permissible stress in the belting is 140 N/cm2. Determine (a) diameter of the driving pulley, (b) maximum power that may be transmitted by the belting, and (c) required initial tension in the belt. Q4/ A V-belt of mass 0.9 kg/m length are used to transmit power between two shafts. The angle of lap is 170° and angle of groove is 45°. u = 0.17 and maximum permissible tension in the belt is limited to 2.2 kN. Find (a) velocity of belt for maximum power and (b) power transmitted at this velocity.
A steel core is bonded firmly to the copper tube (shell) to form the shaft shown. The length of the shaft is 450 mm and the end A is fixed to the wall. Take the shear modulus of steel and copper as 76 GPa and 38 GPa, respectively. The diameter of the core is 60 mm and the outer diameter of the shaft is 100 mm. Determine the maximum external torque (Tmax) so that the absolute maximum shear stress for any point H on the surface of the copper shell does not exceed 50 MPa. 450 mm A 100 mm 60 mm В Tmax =? kN · m