Accession Number : AD0709047

Title :   USE OF PRECRACKED SPECIMENS IN STRESS-CORROSION TESTING OF HIGH-STRENGTH ALUMINUM ALLOYS,

Corporate Author : BOEING CO RENTON WASH COMMERCIAL AIRPLANE GROUP

Personal Author(s) : Hyatt,Michael V.

Report Date : NOV 1969

Pagination or Media Count : 58

Abstract : Resistance to stress-corrosion cracking of 10 high-strength aluminum alloys in a variety of heat-treatment conditions was measured using precracked double cantilever beam (DCB) specimens. A new technique is described, and stress-corrosion crack growth rates for the alloys tested are presented as a function of the plane-strain stress intensity K(I). Double cantilever beam specimen data correlated with established trends from smooth specimens tested by alternate immersion in 3.5% NaCl solution. From the crack growth rate data and the speed and simplicity with which it is obtained, it is concluded that the DCB specimen will be highly useful for (1) comparing and rating alloys, (2) developing new alloys and heat treatments, (3) comparing the effects of environments, (4) achieving or ensuring product uniformity, and (5) studying mechanisms of cracking. (Author)

Descriptors :   (*ALUMINUM ALLOYS, *STRESS CORROSION), (*HEAT TREATMENT, ALUMINUM ALLOYS), CANTILEVER BEAMS, CRACK PROPAGATION, QUENCHING, SODIUM CHLORIDE

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE