FATIGUE TESTING OF 70-30 COPPER-NICKEL.
Abstract
An investigation is made of the feasibility of the use of the S/N Fatigue Life Gage as a monitoring device for cumulative fatigue damage in 70-30 copper-nickel. The study is aimed at verifying the hypothesis that the permanent change in resistance experienced by such a gage when bonded to a structure subjected to varying load conditions is a function of the strain history of the underlying material, and that the total resistance change in the gage at the time of crack initiation in the structure is essentially constant, independent of strain level or history. In particular, because of its importance in naval applications, the material for which this hypothesis has been examined in this study is 70-30 copper-nickel. The hypothesis is sufficiently well verified to justify recommending testing at additional strain levels, and evaluating the effects of block-cycling, aging and other influences likely to be encountered in in-service monitoring of fatigue damage. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1969
- Accession Number
- AD0708384
Entities
People
- Gary Lee Rowe
Organizations
- Naval Postgraduate School