GB/T 4732.5-2024

This standard specifies the elastic-plastic analysis method for the design of pressure vessels, providing detailed procedures for calculating plastic collapse loads, ratcheting limits, and fatigue life under cyclic loading. It is applied in the engineering design and verification of high-pressure and thick-walled vessels, particularly in the chemical, petrochemical, and nuclear industries, where components must withstand extreme operating conditions beyond elastic limits. The standard ensures structural integrity and safety by allowing controlled plastic deformation in localized regions while preventing failure mechanisms like incremental collapse or low-cycle fatigue.