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The report summarizes information from selected European papers and lectures that were published or presented between mid 1967 and July 1, 1968. Subjects discussed include: the nature of stress-corrosion, stress-corrosion in AlMg, AlMgZn, and AlMgSi alloys and testing for susceptibility to stress-corrosion cracking. (Author).
Stress corrosion requires: a sustained tensile stress, a corrosive environment, and a susceptibility of the particular alloy and processing history. Material selection and careful design, manufacturing, and assembly practices are effective in mitigating stress corrosion. (Author).
The phenomenon known as stress corrosion has been defined in several ways. For example, the definition which has been accepted in England is restricted to static stress: 'The term 'stress corrosion' implies a greater deterioration in the mechanical properties of the material through the simultaneous action of the static stress and exposure to corrosive environment than would occur by the separate, but additive action of these surroundings.' This definition includes stress-accelerated corrosion, but excludes corrosion fatigue. (Author).
This report deals with the stress-corrosion cracking of aluminum alloys, and it represents an effort by DMIC to expand on the information contained in DMIC Memorandum 202, 'Stress-Corrosion Cracking of Aluminum Alloys', dated February 15, 1965. DMIC Report 228 begins by presenting a comprehensive definition of stress-corrosion cracking. This is followed by sections dealing with (1) the historical development and growth in awareness of the problem, (2) the mechanisms involved, and (3) the theory of stress-corrosion cracking. A section on experimental techniques is presented. These techniques include test methods used to determine the susceptibility of alloys to stress-corrosion cracking, as well as more refined methods of studying the fundamental mechanisms of the problem. Different evaluation methods, applicable to obtaining the different objectives of stress-corrosion testing, are also presented. All of the foregoing serve as background to the sections on stress-corrosion-cracking behavior of aluminum alloys and preventive measures. (Author).
Details the many conditions under which stress-corrosion cracking (SCC) can occur, the parameters which control SCC, and the methodologies for mitigating and testing for SCC, plus information on mechanisms of SCC with experimental data on a variety of materials. Contains information about environmen