| Abstrakt: |
The author points out that old conventional formulas for determining stresses in helical springs are unsatisfactory and that the complicated equations offered in the past few years by different authors are too cumbersome, especially when the curvature of the bar, pitch angle, and bending stress for correct stress determination are considered. If all of the stress-influencing factors are considered, the equations introduced in recent years become so cumbersome that designers are tempted to sacrifice accuracy for convenience by neglecting these factors. Such short cuts for evading complications are unsatisfactory because the range of error thus introduced is not fully known nor realized. Because of these conditions, the author has developed new stress formulas for calculating stresses in helical springs and presents them in this paper. These formulas are for use in determining the stresses in helical springs of circular-bar and rectangular-bar cross section. They include the proper consideration of bar curvature, pitch angle, and bending stress, but nevertheless they are extremely simple. The author makes the design calculations for tension and compression helical springs to show the application of the formulas he has developed. |
