A helical compression spring with squared and ground ends is made of music wire. It is to have a spring rate of 2,400 N/m. The force corresponding to a solid length is 120 N. The spring index is set to be 10. At closure use a design factor of 1.2 guarding against yielding. For static loading, determine the wire diameter, the mean coil diameter, the number of coils, the free and solid lengths of the spring, and show whether buckling may occur.

A helical compression spring with squared and ground ends is made of music wire. It is to have a spring rate of 2,400 N/m. The force corresponding to a solid length is 120 N. The spring index is set to be 10. At closure use a design factor of 1.2 guarding against yielding. For static loading, determine the wire diameter, the mean coil diameter, the number of coils, the free and solid lengths of the spring, and show whether buckling may occur.

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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3. A helical compression spring with squared and ground ends is made of music wire. It is to have a spring rate of 2,400 N/m. The force corresponding to a solid length is 120 N. The spring index is set to be 10. At closure use a design factor of 1.2 guarding against yielding. For static loading, determine the wire diameter, the mean coil diameter, the number of coils, the free and solid lengths of the spring, and show whether buckling may occur.
A helical compression spring having 14 active coils is close coiled. It has a spring stiffness of 400lb/in. It is cut into two springs having 6 and 8 turns. Determine the spring stiffnesses of resulting springs.
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A helical compression spring has a scale of 500 lb/in., an outside diameter of 2.75 in, a free length of 8 inches and with squared and ground ends. The load is 1,000 lbs and the working stress on the wire material is 65000 psi. If the Wahl factor of 1.25 is to be used, calculate the following: A. The standard wire diameter B. The number of active coil if G = 10 800 000 psi C. The solid height D. The stress at solid height
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spring is to be inserted with an initial compression to produce a force equal to 125 N between the right-hand end of the lever and the stop. When the maximum force at A reaches to a value of 200 N, the end of the lever moves downward by 25 mm. assuming a spring index 8 determine the following parameters: 1. Spring rate 2. Size of the wire 3. Outside diameter of the spring 4. Number of active coils, and 5. Free length, assuming squared and ground ends Note: the allowable shear stress may be taken as 420 MPa, and G = 80 GPa. Hint: Ans. 0.33 N/mm: 3.4 mm; 27.2 mm; 77 mm - 200 mm - 200 mm Lever Stop -Spring