Session: CS-01-01 Structural Integrity of Pressure Components

Paper Number: 61367

Start Time: Tuesday, July 13, 2021, 09:00 AM

61367 - Twice-Yield Method Abaqus Implementation With Application to a Thermally Shocked Stepped Pipe 

Title: Twice-Yield Method Abaqus Implementation with Application to a Thermally Shocked Stepped Pipe  

Authors: Steven M. Smith, Naval Nuclear Laboratory, Bettis Site 

David N. Hutula, Naval Nuclear Laboratory, Bettis Site 

Abstract: 

The Twice-Yield method is an elastic-plastic finite element analysis (FEA) pioneered by Professor Arturs Kalnins at Lehigh University which approximates the stabilized cyclic response that would otherwise be obtained from a cycle-by-cycle elastic-plastic FEA.  The Twice-Yield method is used to evaluate the load range conditions which occur between any two load states from the stabilized cyclic structural response.  The rigorous implementation of the Twice-Yield method requires special handling of material properties.  In particular, the method requires the average of the properties corresponding to the two load states.  This paper documents a detailed technical basis of the Twice-Yield method’s implementation in Abaqus including the special handling of material properties.  An assessment of the Twice-Yield method is performed based on analyzing a thermally shocked stepped pipe.  Included in the assessment are comparisons of the cycle-by-cycle elastic-plastic FEA results and the Twice-Yield method elastic-plastic FEA results.  The comparisons show the efficacy of the Twice-Yield method as a viable elastic-plastic cyclic analysis method. 

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Presenting Author: Steven Smith Fluor Marine Propulsion, LLC

Authors:

Steven Smith Fluor Marine Propulsion, LLC
David Hutula Fluor Marine Propulsion, LLC