THE INFLUENCE OF ENVIRONMENT ON THE CRACK PROPAGATION CHARACTERISTICS OF HIGH STRENGTH ALUMINUM ALLOYS.
Technical research rept.,
PITMAN-DUNN RESEARCH LABS FRANKFORD ARSENAL PHILADELPHIA PA
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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 3-12 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
- Properties of Metals and Alloys