Fatigue Behavior of Sheet Materials for the Supersonic Transport. Volume I. Summary and Analysis of Fatigue and Static Test Data.

摘要

To obtain comparative fatigue test data on three sheet materials selected for possible use on supersonic transports, a multi-phase program of tests was carried out using speciments of duplexannealed 8-1-1 titanium, PH14-8 Mo (SRH 1050) stainless steel and Inco 718 alloy in the 20% cold rolled and aged condition. Unnotched, centernotched, fusion-welded and spotwelded specimens were used. Constant load amplitude (S-N) fatigue tests were conducted at room temperature, 400 and 650 F on specimens having no prior exposure and on specimens with prior exposure to a constant load at 400 or 650 F for 100, 1000 or 5000 hours. An evaluation was also made of the effect of applying contaminants during S-N testing at 550 and 650 F to specimens having no prior exposure and to specimens exposed to load and contaminant at 550 F for 1000 hours. (Author)