Machine Elements in Mechanical Design (6th Edition) (What's New in Trades & Technology)
6th Edition
ISBN: 9780134441184
Author: Robert L. Mott, Edward M. Vavrek, Jyhwen Wang
Publisher: PEARSON
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Chapter 1, Problem 9P
For the devices described in Problems1−14, write a set of functions and design requirements in a similar manner to those in Section1−4. You or your instructor may add more specific information to the general descriptions given.
9. A crane to lift building materials from the ground to the top of a building during construction.
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Q6/ A helical square section spring is set inside another, the outer spring having a free
length of 35 mm greater than the inner spring. The dimensions of each spring are as
follows:
Mean diameter (mm)
Side of square section (mm)
Active turns
Outer
Inner
Spring
Spring
120
70
8
7
20
15
Determine the (1) Maximum deflection of the two springs and (2) Equivalent spring
rate of the two springs after sufficient load has been applied to deflect the outer
spring 60 mm. Use G = 83 GN/m².
Q2/ The bumper springs of a railway carriage are to be made of rectangular section wire.
The ratio of the longer side of the wire to its shorter side is 1.5, and the ratio of mean
diameter of spring to the longer side of wire is nearly equal to 6. Three such springs
are required to bring to rest a carriage weighing 25 kN moving with a velocity of
75 m/min with a maximum deflection of 200 mm. Determine the sides of the
rectangular section of the wire and the mean diameter of coils when the shorter side is
parallel to the axis of the spring. The allowable shear stress is not to exceed 300 MPa
and G = 84 kN/mm².
Q6/ A belical
11.
A load of 2 kN is dropped axially on a close coiled helical spring, from a height of 250 mm. The spring
has 20 effective turns, and it is made of 25 mm diameter wire. The spring index is 8. Find the maximum
shear stress induced in the spring and the amount of compression produced. The modulus of rigidity
for the material of the spring wire is 84 kN/mm².
[Ans. 287 MPa; 290 mm]
Chapter 1 Solutions
Machine Elements in Mechanical Design (6th Edition) (What's New in Trades & Technology)
Ch. 1 - For the devices described in Problems114, write a...Ch. 1 - For the devices described in Problems114, write a...Ch. 1 - For the devices described in Problems114, write a...Ch. 1 - For the devices described in Problems114, write a...Ch. 1 - For the devices described in Problems114, write a...Ch. 1 - For the devices described in Problems114, write a...Ch. 1 - For the devices described in Problems114, write a...Ch. 1 - For the devices described in Problems114, write a...Ch. 1 - For the devices described in Problems114, write a...Ch. 1 - For the devices described in Problems114, write a...
Ch. 1 - For the devices described in Problems114, write a...Ch. 1 - For the devices described in Problems114, write a...Ch. 1 - For the devices described in Problems114, write a...Ch. 1 - For the devices described in Problems114, write a...Ch. 1 - For Problems 1528, perform the indicated...Ch. 1 - For Problems 1528, perform the indicated...Ch. 1 - For Problems 1528, perform the indicated...Ch. 1 - For Problems1528, perform the indicated conversion...Ch. 1 - For Problems1528, perform the indicated conversion...Ch. 1 - For Problems1528, perform the indicated conversion...Ch. 1 - For Problems1528, perform the indicated conversion...Ch. 1 - For Problems1528, perform the indicated conversion...Ch. 1 - For Problems1528, perform the indicated conversion...Ch. 1 - For Problems1528, perform the indicated conversion...Ch. 1 - For Problems1528, perform the indicated conversion...Ch. 1 - For Problems1528, perform the indicated conversion...Ch. 1 - For Problems1528, perform the indicated conversion...Ch. 1 - For Problems1528, perform the indicated conversion...
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