Abstract

In this paper more exact formulas are derived for computing stress in heavy closely coiled helical springs of the type used frequently in railway work. These formulas indicate that the maximum stress in such springs may, in many practical cases, be from 40 to 60 per cent greater than the stress computed by the use of ordinary helical-spring formulas. The new formulas are verified by strain measurements, using special extensometers on semi-coils of actual springs loaded so as to simulate the axial loading of a complete spring, and on complete springs loaded in compression. The work indicates that the frequent failures of this type of spring in service may, at least in part, be due to the existence of higher stresses than has been thought possible on the basis of ordinary spring formulas.

This content is only available via PDF.
You do not currently have access to this content.