A Study of Local Stress Histories in Loaded and Unloaded Holes and Their Implications to Fatigue Life Estimation
Abstract
This report presents local stress measurements in aluminium alloy specimens at open holes and pin-loaded holes of the same elastic stress concentration factor, under variable amplitude loading. The Companion Specimen Method was used and the results are interpreted with particular reference to fatigue life estimation. In addition the Neuber Test and Linear Strain Methods were used to make estimates of the local stress history for the case of the open hole. Companion Specimen Tests with an ascending-descending zero to peak stress sequence showed that there was no significant difference in local stress ranges or residual stresses between an open hole and a pin-loaded hole of the same stress concentration. A comparable Neuber Test produced errors in both maximum local strains and residual stresses and ways of improving this method are discussed. The Linear Strain Method in the form currently suggested by ESDU made poor estimates of residual stresses.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1976
- Accession Number
- ADA041718
Entities
People
- B. H. Perrett
- J. E. Moon
- P. R. Edwards