Electronics Incorporated - The Shot Peener - Shot Peening Library
Title: Shot Peening in Spring Design
Author: Straub, John C
Source: Springs October 1966
Publication year 1966
Document number: 1966031
Number of pages: 9
Abstract:
Shot peening is a process utilizing the impact of metallic shot on the surface of machine parts. While in general, there are other purposes of shot peening, its major
purpose is increased fatigue strength of components which are subject to failure due to repetitive application of stress.
It has been used for many years for the purpose of preventing the recurrence of failure in a particular design. Presumably for that reason, the process is often referred to
as one which can provide an increase of 200% or 300% in life. However, this is far short of the available gain in fatigue strength by this process.
It is my firm belief that the available gain in fatigue strength is great enough that it can be used not only to eliminate failures in an existing design, but also to
increase the working stresses, therby permitting an attractive reduction in the size and weight of the part. This is particularly true in springs in which a large proportion
of the spring is subjected to high working stresses. In volume production, this can result in an attractiv ereduction of the coat of manufacturing springs. In addition to
the saving in weight as such, there are those applications in which the reduction of an assembly is limited by the space that can accomodate a spring which may be a bital
part of the assembly.
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