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Certain material properties of 5083-0 aluminum alloy which would be of interest to designers of liquefied natural gas (LNG) tankage are presented and discussed. Fatigue crack growth rates obtained both from specimens containing a semielliptical surface flaw and from compact tension specimens are given and compared to other published data. Values of Kc for 2-in.-thick plate obtained from center-cracked specimens at room temperature and from compact tension specimens at both room temperature and -260°F and static and dynamic loading are presented. For the latter specimens, R-curves used in the determination of Kc values are also given. Finally, KIc values are estimated using the J-integral technique.
The application of these data to the design of LNG tankage is discussed, paying particular attention to conditions required to assure “leak before failure” behavior.
storage tanks, fatigue (materials), fracture properties, cracking (fracturing)
Metallurgical engineer, Societe Technigaz, Maurepas,
Visiting professor of engineeringpresident, Brown UniversityDel Research Corporation, ProvidenceHellertown, R.I.Pa.
Naval architect, American Technigaz, Incorporated, Boston, Mass.