Accession Number : ADA325853

Title :   Development of Fatigue and Crack Propagation Design and Analysis Methodology in a Corrosive Environment for Typical Mechanically-Fastened Joints - Volume IV - Phase II Test and Fractographic Results.

Descriptive Note : Final rept. Sep 82-Oct 84,

Corporate Author : GENERAL DYNAMICS CORP FORT WORTH TX

Personal Author(s) : Gordon, D. E. ; Kirschner, S. B. ; Manning, S. D. ; Wel, R. P.

PDF Url : ADA325853

Report Date : 30 AUG 1984

Pagination or Media Count : 280

Abstract : 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 IV are evaluated in Volume III. Variables included in the Phase II test program were material (7075-T7651 and Ti-6Al-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 alternate 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 herein are for 7075-T7651 aluminum alloy dog-bone specimens. These results were used to evaluate the corrosion fatigue analysis methodology for crack initiation and crack propagation in Volume III. Ti-6Al-4V alloy results herein are limited to unnotched strain controlled tests. Further titanium research conducted under Phase II, including experimental results and evaluations, is documented in Volume V.

Descriptors :   *ALUMINUM ALLOYS, *FRACTOGRAPHY, *CRACK PROPAGATION, *FATIGUE(MECHANICS), *BOLTED JOINTS, FREQUENCY, CORROSION, EXPOSURE(GENERAL), LOADS(FORCES), CRACKING(FRACTURING), STRAIN(MECHANICS), FASTENINGS, TITANIUM ALLOYS, VANADIUM ALLOYS.

Subject Categories : Properties of Metals and Alloys
      Couplers, Fasteners, and Joints
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE