Accession Number : AD0632988

Title :   THE INFLUENCE OF ENVIRONMENT ON THE CRACK PROPAGATION CHARACTERISTICS OF HIGH STRENGTH ALUMINUM ALLOYS.

Descriptive Note : Technical research rept.,

Corporate Author : PITMAN-DUNN RESEARCH LABS FRANKFORD ARSENAL PHILADELPHIA PA

Personal Author(s) : Mulherin,Joseph H.

Report Date : APR 1966

Pagination or Media Count : 27

Abstract : The stress-corrosion behavior of four alloys of aluminum was investigated. Using cantilever-loaded fatigue-cracked specimens, the crack propagation characteristics of 7178-T6, 2014-T6, 2024-T351, and 7075-T6 aluminum alloys were determined. The aqueous environments used were: immersion in distilled water, constant immersion in 3-1/2 percent sodium chloride, and alternate immersion in salt solution and air. The results are interpreted in terms of fracture mechanics parameters. Where susceptibility to stress-corrosion exists, the rate of crak propagation is dependent upon stress intensity and environment. A method is also presented to obtain threshold values of stress intensity for stress-corrosion attack with minimal experimental effort. Results are compared to those of other testing methods. (Author)

Descriptors :   (*ALUMINUM ALLOYS, *FRACTURE(MECHANICS)), LIQUID IMMERSION TESTS, STRESS CORROSION, STRESSES, PROPAGATION, ENVIRONMENTAL TESTS

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE