Question

A helical compression spring is made from music wire that is 1.04 mm in diameter and has an outer coil diameter of 13.74 mm with a free length of 50.8 mm and 10 total coils with plain ends.

What is the solid length L_{s}?

What is the spring rate k in N/m ?

If the spring rate is 1000 N/m what is the maximum shear stress, tau , in the wire when the spring is compressed 25.4 mm from its free length?

What applied force is required to achieve a compressed length of
L_{s} ?

Use a spring rate of k=1000 N/m.

Answer #1

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A helical spring is to provide a minimum force of 600 N at
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1. Evaluate a music wire spring with plain ends where
the wire diameter is 0.100” and the outer
diameter is 0.600”. The desired spring rate is 100 lbf/in and the
free length is 2.4”. Let the load
safety factor be 1.00.
e) What is the maximum suggested deflection?
f) What is the force to close to solid, Fs?
g) What is the critical length?
h) What is the critical frequency?
i) What is the factor of safety, solid, ns?

2. Use hard-drawn 0.075” diameter wire to make a spring with
closed ends, a spring index of 10,
and 12 total coils. Use a load factor of safety of 1.05 and make
the free length 3.0 inches.
a) What is the spring rate?
b) What is the critical length for absolute stability?
c) What is the maximum suggested load?
d) What is the force to close to solid, Fs?
e) What is the critical frequency?
f) What is the factor...

A wire of diameter 1.0 mm and length 3.5 m stretches 3.5 mm when
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a) What is the Young's modulus for the wire?
b) What is the effective spring constant for the stretching
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