Development of Fatigue and Crack Propagation Design & Analysis Methodology in a Corrosive Environment for Typical Mechanically-Fastened Joints. Volume 4. Phase II Test and Fractographic Results.
Final rept. Sep 82-Aug 84,
GENERAL DYNAMICS FORT WORTH TX FORT WORTH DIV
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This report contains the test results and raw fractographic data acquired under Phase II of the corrosion fatigue program for mechanically-fastened joints. The results presented in this volume 4 are evaluated in vol. 3. Variables included in the Phase II test program were material 7075-T7651 and Ti-6A1-4V, environment dry air and 3.5 NaCl, load spectra F-16 400 Hr. and F-18 300 Hr., type loading strain-controlled, constant amplitude, spectrum, stress level a base-line stress three alternayte stresses, specimen conditioning none preconditioned, loading frequency four loading rates, specimen type strain controlled, compact tension and dog-bone and bolt load transfer 0, 20, 40. Most of the results are for 7075-T7651 aluminum alloy dog-bone specimens. These results were used to evaluate the corrosion fatigue analysis method for crack initiation and crack propagation in Vol. 3. Ti-6Al-4V alloy results are limited to un-notched strain controlled tests. Further titanium research conducted under Phase II, including experimental results and evaluations, is documented in vol.5. Keywords Crack initiation Crack propagation Environment Loading Percent bolt load transfer Effect loading frequency Strain controlled tests Preconditioning Long term exposure testing.
- Properties of Metals and Alloys
- Couplers, Fasteners and Joints