Abstract
This paper details an experimental programme designed to simulate the effects of cold gas escape from a crack in the outer mild steel containment tank of an LNG storage tank. Tests involving stressed flat plates in which an artificial defect was locally cooled showed that crack extension occurred when a critical local temperature range was reached. Temperature and strain investigations showed that the crack driving force was generated by thermally induced contraction stresses. In practice, further crack extension could be prevented by application of local heating. The cracks so initiated arrested after travelling a short distance and the arrest temperature conditions are related to stress level. The crack arrest temperature is sub-zero for normal tank design stresses and extensive fracture would not occur in the material investigated.
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