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Accession Number:
AD0711606
Title:
EFFECT OF PRESTRESSING ON THE STRESS-CORROSION RESISTANCE OF TWO HIGH- STRENGTH STEELS
Descriptive Note:
Research rept.
Corporate Author:
BOEING CO RENTON WA COMMERCIAL AIRPLANE GROUP
Report Date:
1970-05-01
Pagination or Media Count:
19.0
Abstract:
Precracked, single-edge-notched specimens of 4340 steel 194-ksi yield strength and 18 Ni maraging 300 steel were prestressed in laboratory air to various percentages 0 to 90 of K sub Ic and then unloaded. The times to failure were subsequently determined in 3.5 aqueous NaCl solution as a function of initial stress intensity. Prestressing increased the threshold stress intensity K sub Iscc of the 4340 steel, but had only a slight effect on the K sub Iscc of the maraging steel. The times to failure of both steels at initial stress-intensity levels above K sub Iscc were unaffected by prestress. The prestressing effects are attributed to the presence of compressive stresses at the crack tip.
Distribution Statement:
APPROVED FOR PUBLIC RELEASE