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Mechanics of Materials (MindTap Course List)

Mechanics of Materials (MindTap Course List)

9th Edition

ISBN:9781337093347

Author:Barry J. Goodno, James M. Gere

Publisher:Barry J. Goodno, James M. Gere

Chapter11: Columns

Section: Chapter Questions

Problem 11.2.4P: Repeat Problem 11.2-3 assuming that R= 10 kN · m/rad and L = 2 m.

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4.As shown in the figure, a square threaded screw is
used in a vise to exert a pressure of 2 tons. If the
screw is double-threaded and has a pitch of 0.25 m
and a mean radius of 1.5 inch, determine the torque
that must be applied at B to create this pressure.
Assume the coefficient of friction to be 0.15.
P

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Repeat Problem 11.2-3 assuming that R= 10 kN · m/rad and L = 2 m.
(6) A double square-threaded power screw transmits 1,800in-lb of torque and raises a machine head; the head is guided by linear slides with anti-friction bearings, and thus no appreciable friction is involved. If the coefficient of friction for the threads is 0.1, find: (a) the load that can be raised if the screw has 2 threads/in and an outside diameter of 2½in; (b) if a 4000-lb load is to be lowered, what torque must the screw transmit? (c) if the power screw of rotates 10 rpm, what is the linear speed of the driven head in feet per minute?
For the drum brake shown in the following figure, there is an inner rim diameter of 280 mm and dimension a = 90 mm. The shoes have a face width of 30 mm. The force exerted by the cylinder hydraulic is 1000 N and the average coefficient of friction is 0.3. Determine: a) The maximum pressure in each shoe; b) The braking torque; c) Reactions resulting from the pivot pin;
1. A double square thread power screw has a pitch of 6 mm and mean radius of34 mm. If it is used to lift a load 50 kN and coefficient of friction of threads is 0.15, determine the torque required toturn the screw.A. 343.74 N-m B. 353.47 N-m C. 335.47 N-m D. 347.35 N-m2. A lubricated bolt needs an initial torque of 145 lb-ft to take the initial tension brought by the compressor withoutbreaking. Determine the initial torque needed by the bolt if the bolt was not lubricated.A. 107.85 lb-ft B.108.25 lb-ft C. 108.75 lb-ft D. 193.33 lb-ft
In a thrust bearing, the external and the internal diamaters of the contacting surfaces are 320 mm and 200 mm respectively. The total axial load is 80 kN and the intensity of pressure is 350 kN/m2.The shaft rotates as 400 rpm. Taking the coefficient of friction as 0.06, calculate the power lost in overcoming the friction. Also, find the number of collars required for the bearing.
An elevator type lift is being designed to raise a load up to 5,000pounds between floors. Two square-thread lead screws, 1.5 inches in (major) diameter, are used for this application. Determine the torque required to raise this lift if the moving part of the elevator weighs 800 pounds and the coefficient of friction is assumed to be 0.15. For the elevator described, find the efficiency and power required if each lead screw is driven at 175 rpm. Verify if this is self locking.
....An electric motor drives a compressor by use of V-belt. The angle of contact on the smaller pulley is 2.89 rad and the belt speed runs at 29.36 m/s. The groove angle of the pulleys is 35°. Determine the tension in the slack side of the belt in N if the belt has a cross-sectional area of 366 mm2, density 1000 kg/m3, and an allowable tensile stress of 2.3 MPa. The coefficient of friction between the belt and the pulley is 0.3
In a pulley brake with inside shoes with an inner rim diameter of 300 mm given in the figure,R= 150 mm, shoe width 37.5 mm. The value of the force F applied on the shoes isIt is 2 kN. If the average friction coefficient is taken as 0.28;a) Max. what is the value of the pressure?b) Find the braking and normal torques and the total torque at each shoe.c) What are the values of the reaction forces on the right shoe knuckle pin?Note: Max. Take the angle (theta) at which the pressure “pa” occurs as 90 degrees.
(2) A single square thread jackscrew has 2.0TPI. It is to lift 15 tons. The friction radius of the collar is 1-in. The coefficient of friction between the threads and screws and base is 0.15, that between the screw and collar is 0.13. Determine: (a) the diameter of the root of the screw if the allowable stress in compression is 6,000psi; (b) the pull required at the end of 5.0ft bar to raise the load; (c) the twisting moment exerted at the root of the threads; (d) the efficiency of the screw and collar.
The inner and outer radii of a hollow steel shaft are 50 mm and 100 mm, respectively. The hub of a steel gear wheel that is shrunk onto the hollow shaft has an outer radius of 150 mm. The maximum allowable tangential stress developed by shrinking the gear wheel onto the hollow shaft is 200 MPa. The length of hub parallel to the shaft axis is 200 mm, and the coefficient of static friction between the hub and the shaft is 0.40. Determine the maximum torque that may be transmitted by the gear wheel without slipping on the shaft.
4.) A flat belt makes contact with an 16 in. diameter pulley through half its circumference. If the coefficient of friction is 0.45 , and a torque of300ft−bsis to be transmitted, calculate the belt tensions. (please type answer not write by hend)
The root diameter of a triple threaded power screw is 550 mm It has a pitch of 10 mm It is used to lift a load of 15 kN. The collar of the screw has an outside diameter of 100 mm and an inner diameter 60 mm Find the force applied at a radius of 950 mm if the coeffcient of friction for both threads and collar is 0.20.

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