5.12 Two concentric close-coiled helical springs arranged one within the other, control the operation of a valve. The particulars of the outer spring are: 12 coils; 25 mm mean coil diameter; wire diameter 3 mm; and initial compress- ion when valve is closed 5 mm. The initial compression of the inner spring is 11 mm and a total load of 150 N is required to open the valve 10 mm. Calculate the stiffness of each spring and the number of coils on the inner spring if its wire diameter is 2 mm and the mean coil diameter is 15 mm. What will the stress in each spring be? (Take G for both springs as 81,5 GPa.)

5.12 Two concentric close-coiled helical springs arranged one within the other, control the operation of a valve. The particulars of the outer spring are: 12 coils; 25 mm mean coil diameter; wire diameter 3 mm; and initial compress- ion when valve is closed 5 mm. The initial compression of the inner spring is 11 mm and a total load of 150 N is required to open the valve 10 mm. Calculate the stiffness of each spring and the number of coils on the inner spring if its wire diameter is 2 mm and the mean coil diameter is 15 mm. What will the stress in each spring be? (Take G for both springs as 81,5 GPa.)

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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Buckling of columns

The column is described as a vertical member of the structure that carries an axial compressive load, and buckling is a lateral deformation of the column under the application of load.

Question

5.12 Two concentric close-coiled helical springs arranged one within the other,
control the operation of a valve. The particulars of the outer spring are: 12
coils; 25 mm mean coil diameter; wire diameter 3 mm; and initial compress-
ion when valve is closed = 5 mm.
The initial compression of the inner spring is 11 mm and a total load of 150 N
is required to open the valve 10 mm. Calculate the stiffness of each spring and
the number of coils on the inner spring if its wire diameter is 2 mm and the
mean coil diameter is 15 mm. What will the stress in each spring be? (Take G
for both springs as 81,5 GPa.)

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