Abstract: A fracture criterion based on plastic limit lend theory was propound for characterizing the fracture behavior of liquefied petroleum gas cylinder with or without defects. The damage tolerance derived from this criterion was admired in Chinese Standard "Periodic Inspection and Evolution of Liquefied Petroleum Gas Cylinder".

Key words: 塑性断裂, 塑性失稳, 损伤容限, 压力容器