Development of Fatigue and Crack Propagation Design and Analysis Methodology in a Corrosive Environment for Typical Mechanically-Fastened Joints. Volume 3. Phase II Documentation.
Final rept. Sep 82-Oct 84,
GENERAL DYNAMICS FORT WORTH TX FORT WORTH DIV
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A workable corrosion fatigue CF analysis methodology has been developed for mechanically-fastened joints. The methodology includes the strain-life approach for predicting time-to-crack-initiation TTCI and the deterministic crack growth approach for predicting crack propagation. Guidelines are presented for acquiring the experimental data and for implementing the CF analysis. The CF analysis methodology was evaluated for 7075-T7651 aluminum, three load spectra, two environments i.e., dry air and 3.5 NaCl, and three different bolt load transfer levels i.e., 0, 20, and 40. Originator-supplied keywords Corrosion fatigue Crack initiation Crack propagation Environment dry air, 3.5 NaCl Loading constant amplitude spectrum Percent bolt load transfer Effect loading frequency Strain controlled tests Preconditioning Long term exposure testing.
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