Final Report for 16 June 1958-16 June 1961,
EATON MFG CO DETROIT MICH
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Methods of pre-stressing driving springs were investigated included were the pressing of springs one or more times to their actual solid, cycling or gymnastification of a spring part prior to assembly, and locking up of a spring at its solid height for an extended period. Hot pressing or heat setting techniques to predict optimum spring designs were combined with the previously discussed processes. Fabrication and coiling techniques of stranded wire were investigated. Photographic studies of time-displacement and surge wave phenomena were made. Fine particle peening produced a marked increase in the fatigue life of the small helical compression springs. Double peening for small spring parts appears to increase life significantly. Extra high tensile materials reduced load loss in springs where high load loss and poor fatigue were experienced however, there was a reduction in fatigue life. Preliminary work on a Military Specification was begun.