Final rept. 26 Mar 1973-30 Jun 1774
BATTELLE COLUMBUS DIV OH
Pagination or Media Count:
The report presents analytical and experimental techniques for defining the stress-strain and deformation states around holes filled with tapered shank interference fit fasteners. A prescription for fatigue-life analysis and prediction is developed wherein the above noted data are used. Stresses and plastic strains around fastener holes are determined analytically for two- and three-dimensional elastic and elastic-plastic cases using AXISOL and MARC computer codes. These results are evaluated based on data obtained from the dislocation etching technique, speckle photography experiments, and electrical resistance strain gages. A fatigue analysis technique is developed based on 1 a mechanics analysis to estimate local stress and strain and 2 a calculation of fatigue damage. This analysis provides a good estimate of life to crack initiation. Fastener installation variables are studied and critical ones selected. Constant amplitude and spectrum loading fatigue tests are reported and the data used to verify fatigue life predictions.
- Couplers, Fasteners and Joints