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2915 - Ratcheting and Sustained Stress Indices for Piping System Components with CAESAR II

Sustained stress indices (SSIs) in the B31.3 piping code and ratcheting each involve plasticity mechanisms. Recent tests and FEA analysis show how sustained stress indices can be consistently developed and how ratcheting can be adequately predicted. The recommended B31 basis is shown to satisfy the requirements of ASME VIII Division 2, Part 5. This presentation will clearly define SSIs and give typical values that can be used in B31.3 pipe stress analysis.