Starting with a spring index of C = 10, design a compression
coil spring of 302 stainless wire with squared ends. The spring is
to deflect y = 50 mm, for an applied force of F = 90 N and to close
solid when ys = 60 mm. At closure, use a design factor of 1.2
guarding against yielding. Select the smallest diameter wire where
wire diameters are available in 0.2-mm increments between 0.2 to
3.2 mm. For the design,...
The force produced by a spring is
always opposite to the direction of compression or
expansion
always opposite to the direction of expansion but in the
direction of compression
always opposite to the direction of compression but in the
same direction as expansion
always in the same direction as expansion or compression
The 75.0 kg hero of a movie is pulled upward at a constant
velocity by a rope. What is the tension on the rope?
7.65N
735N
this problem...
A compression spring has a diameter of 0.67 in and a coil
diameter of 0.067 in, with 30 total coils.
The spring is to be made of unpeened HD A227 wire and have squared
and ground ends. Find the
fatigue factor of safety when repeatedly cycled from 0 to 10.3 lbf.
Use the Gerber fatigue criterion
and the Zimmerli data.
Calculate the expected life of N (# of cycles) in a compression
spring with the specifications.
Material: 302 Stainless Steel
End type: closed
Overall Length: 2"
OD: 0.5"
ID: 0.406"
Wire Diameter: 0.047"
Wire Shape: Round
Compressed Lenght: 1.35"
Maximum Load: 3.8 lbs
Rate: 5.85 lbs/in
RoHS: Compliant
Problem
10-3
A helical compression spring is wound using 2.5-
mm
-diameter music wire. The spring has an outside diameter of
31
mm with plain ground ends, and 14 total coils.
(a) Estimate the spring rate.
(b) What force is needed to compress this spring to
closure?
(c) What should the free length be to ensure that when the
spring is compressed solid the torsional stress does not
exceed the yield strength?
(d) Is there a possibility that the spring...
A helical compression spring has 14 active coils and the free
length is 12.5in. The outside diameter is 7/16 in and the spring
has squared and ground ends. The end plates are constrained to be
parallel. The material is music wire with presetting. The wire
diameter is 0.042 in. Determine: (1) for static conditions compute
the spring index, the solid length, the stress when the spring is
compressed to the solid length. Check if static yielding occurs
while the spring...
An as-wound helical-coil compression spring with infinite
fatigue life is needed to resist a dynamic load that varies from
8.0 to 24.0 lbf at 45.0 Hz over a dynamic deflection of 0.3 in.
Because of assembly considerations, the solid length of the spring
cannot be more than 1.2 in. The spring should have squared and
ground ends and is to be made from peened music wire. Upon closure,
use a design factor of 1.2 guarding against yielding and a
fractional...
A helical compression spring is wound using 1 mm-diameter music
wire. The outside coil diameter of the spring is 11 mm. The ends
are squared and there are 12 total turns.
(a) Estimate the torsional yield strength of the wire.
(b) Estimate the static load corresponding to the yield
strength.
(c) Estimate the scale of the spring.
(d) Estimate the solid length of the spring.
(e) Is there any possibility for buckling?