Effects of Pitch Angle and Damping on Stresses in Helical Spring

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The effects of the pitch angle and damping on stresses in the helical spring are investigated by using the finite element method. In the static analysis, the effects of the pitch angle and the number of active coils on the maximum principal stress, which is a primary cause of the fatigue failure, are discussed and it is pointed out that there is a pitch angle where the maximum principal stress on the outside of coils become equal to that on the inside of coils. In the dynamic stress analysis, the effect of damping on the stress is discussed and stress distributions along the wire axis in surge are estimated for a helical spring with one end clamped and the other end compressed sinusoidally along the spring axis. The obtaind results are corroborated with the experimental results.
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