On the incorporation of an improved cyclic plasticity model into a finite element code to simulate ratcheting in piping
- North Carolina State Univ., Raleigh, NC (United States). Center for Nuclear Power Plant Structures, Equipment and Piping
Three high-level test programs on piping components have been reviewed to assess both the experiments and the finite element modeling of the components under cyclic loads. Particular attention was paid to the plasticity constitutive models. The authors concluded from the study that existing commercial finite element codes are not capable of accurately simulating ratcheting and that ratcheting is generally overpredicted. They further conclude that the shortcomings can be traced to inaccurate plasticity models. An improved mathematical model, based on the results of a set of cyclic tests on tubular steel specimens, is reviewed to assess its potential for use in a user subroutine in ANSYS, a commercially available finite element code. A verification program for the modified finite element code using a consistent set of material and structural test data is described. Future research will include modifications to the plasticity model to accommodate time and temperature dependencies. The resulting finite element code could be used in a variety of applications to improve the safety and reduce the cost of piping systems. Among these applications are the following: development of simplified analysis and design procedures, improved ability to interpret results from existing test data, design of future test programs and occasional reanalysis of critical piping systems or components for operability purposes.
- OSTI ID:
- 170337
- Report Number(s):
- CONF-950740-; ISBN 0-7918-1343-6; TRN: 96:006298
- Resource Relation:
- Conference: Joint American Society of Mechanical Engineers (ASME)/Japan Society of Mechanical Engineers (JSME) pressure vessels and piping conference, Honolulu, HI (United States), 23-27 Jul 1995; Other Information: PBD: 1995; Related Information: Is Part Of Seismic engineering 1995. PVP-Volume 312; Ma, D.C. [ed.] [Argonne National Lab., IL (United States)]; Suzuki, K. [ed.] [Tokyo Metropolitan Univ., Hachioji, Tokyo (Japan)]; Aggrawal, M.L. [ed.] [and others]; PB: 470 p.
- Country of Publication:
- United States
- Language:
- English
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