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Title: FY16 Progress Report on Test Results In Support Of Integrated EPP and SMT Design Methods Development

Abstract

The proposed integrated Elastic Perfectly-Plastic (EPP) and Simplified Model Test (SMT) methodology consists of incorporating an SMT data-based approach for creep-fatigue damage evaluation into the EPP methodology to avoid using the creep-fatigue interaction diagram (the D diagram) and to minimize over-conservatism while properly accounting for localized defects and stress risers. To support the implementation of the proposed code rules and to verify their applicability, a series of thermomechanical tests have been initiated. This report presents the recent test results for Type 2 SMT specimens on Alloy 617, Pressurization SMT on Alloy 617, Type 1 SMT on Gr. 91, and two-bar thermal ratcheting test results on Alloy 617 with a new thermal loading profile.

Authors:
 [1];  [2];  [3]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. RI Jetter Consulting, Pebble Beach, CA (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1302933
Report Number(s):
ORNL/TM-2016/330
RC0416000; NERC015
DOE Contract Number:
AC05-00OR22725
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Wang, Yanli, Jetter, Robert I., and Sham, T. -L. FY16 Progress Report on Test Results In Support Of Integrated EPP and SMT Design Methods Development. United States: N. p., 2016. Web. doi:10.2172/1302933.
Wang, Yanli, Jetter, Robert I., & Sham, T. -L. FY16 Progress Report on Test Results In Support Of Integrated EPP and SMT Design Methods Development. United States. doi:10.2172/1302933.
Wang, Yanli, Jetter, Robert I., and Sham, T. -L. 2016. "FY16 Progress Report on Test Results In Support Of Integrated EPP and SMT Design Methods Development". United States. doi:10.2172/1302933. https://www.osti.gov/servlets/purl/1302933.
@article{osti_1302933,
title = {FY16 Progress Report on Test Results In Support Of Integrated EPP and SMT Design Methods Development},
author = {Wang, Yanli and Jetter, Robert I. and Sham, T. -L.},
abstractNote = {The proposed integrated Elastic Perfectly-Plastic (EPP) and Simplified Model Test (SMT) methodology consists of incorporating an SMT data-based approach for creep-fatigue damage evaluation into the EPP methodology to avoid using the creep-fatigue interaction diagram (the D diagram) and to minimize over-conservatism while properly accounting for localized defects and stress risers. To support the implementation of the proposed code rules and to verify their applicability, a series of thermomechanical tests have been initiated. This report presents the recent test results for Type 2 SMT specimens on Alloy 617, Pressurization SMT on Alloy 617, Type 1 SMT on Gr. 91, and two-bar thermal ratcheting test results on Alloy 617 with a new thermal loading profile.},
doi = {10.2172/1302933},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 8
}

Technical Report:

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  • The proposed integrated Elastic Perfectly-Plastic (EPP) and Simplified Model Test (SMT) methodology consists of incorporating a SMT data-based approach for creep-fatigue damage evaluation into the EPP methodology to avoid using the creep-fatigue interaction diagram (the D diagram) and to minimize over-conservatism while properly accounting for localized defects and stress risers. To support the implementation of the proposed code rules and to verify their applicability, a series of thermomechanical tests have been initiated. One test concept, the Simplified Model Test (SMT), takes into account the stress and strain redistribution in real structures by including representative follow-up characteristics in the test specimen.more » The second test concept is the two-bar thermal ratcheting tests with cyclic loading at high temperatures using specimens representing key features of potential component designs. This report summaries the previous SMT results on Alloy 617, SS316H and SS304H and presents the recent development on SMT approach on Alloy 617. These SMT specimen data are also representative of component loading conditions and have been used as part of the verification of the proposed integrated EPP and SMT design methods development. The previous two-bar thermal ratcheting test results on Alloy 617 and SS316H are also summarized and the new results from two bar thermal ratcheting tests on SS316H at a lower temperature range are reported.« less
  • The goal of the Elastic-Perfectly Plastic (EPP) combined integrated creep-fatigue damage evaluation approach is to incorporate a Simplified Model Test (SMT) data based approach for creep-fatigue damage evaluation into the EPP methodology to avoid the separate evaluation of creep and fatigue damage and eliminate the requirement for stress classification in current methods; thus greatly simplifying evaluation of elevated temperature cyclic service. The EPP methodology is based on the idea that creep damage and strain accumulation can be bounded by a properly chosen “pseudo” yield strength used in an elastic-perfectly plastic analysis, thus avoiding the need for stress classification. The originalmore » SMT approach is based on the use of elastic analysis. The experimental data, cycles to failure, is correlated using the elastically calculated strain range in the test specimen and the corresponding component strain is also calculated elastically. The advantage of this approach is that it is no longer necessary to use the damage interaction, or D-diagram, because the damage due to the combined effects of creep and fatigue are accounted in the test data by means of a specimen that is designed to replicate or bound the stress and strain redistribution that occurs in actual components when loaded in the creep regime. The reference approach to combining the two methodologies and the corresponding uncertainties and validation plans are presented. Results from recent key feature tests are discussed to illustrate the applicability of the EPP methodology and the behavior of materials at elevated temperature when undergoing stress and strain redistribution due to plasticity and creep.« less
  • The goal of the proposed integrated Elastic Perfectly-Plastic (EPP) and Simplified Model Test (SMT) methodology is to incorporate a SMT data-based approach for creep-fatigue damage evaluation into the EPP methodology to avoid the separate evaluation of creep and fatigue damage and eliminate the requirement for stress classification in current methods; thus greatly simplifying evaluation of elevated temperature cyclic service. The purpose of this methodology is to minimize over-conservatism while properly accounting for localized defects and stress risers. To support the implementation of the proposed methodology and to verify the applicability of the code rules, thermomechanical tests continued in FY17. Thismore » report presents the recent test results for Type 1 SMT specimens on Alloy 617 with long hold times, pressurization SMT on Alloy 617, and two-bar thermal ratcheting test results on SS316H at the temperature range of 405 °C to 705 °C. Preliminary EPP strain range analysis on the two-bar tests are critically evaluated and compared with the experimental results.« less
  • A test environment was created simulating the temperature and particle velocity conditions to which tube and fin alloys will be exposed in the Curtiss-Wright PFB Combustor. Sample pieces of seven candidate alloys were exposed to the environment for 1000 hours, with weight and surface roughness measurements taken every 250 hours. None of the alloys experienced changes attributable to erosion. 1000-hour duration tests were run with brazed and welded joints and with samples having a number of erosion or corrosion resistant coatings. Once again, no results attributable to erosion were noted. The changes in weight and surface roughness as well asmore » dimensional changes appear to be due entirely to the formation of oxides at the 1600/sup 0/F test temperature. Weight losses can be related to spalling of such oxides from the surface upon removal from the test bed for measurement. No significant difference in behavior of the seven candidate alloys was noted during the exposure. The braze joints, welded joints and coated specimens similarly show no effects of erosion. Unless velocities are increased substantially, in which case further work regarding erosion will be necessary, the mechanism of erosion may be disregarded insofar as its impact on tube material life is concerned. Further efforts should be concerned with corrosion phenomena as the failure mode.« less
  • In order to determine the resistance of metal alloys to high temperature erosion-corrosion in fluidized-bed combustors, sub-sized finned tube bundles were installed in operating commercial fluidized-bed reactors used for the incineration of municipal sewage sludge. The alloys tested were Type 304 stainless steel, Incoloy 800H, Incoloy 601, Inconel 690, and Haynes 188. At the end of the test runs there was no visible evidence of deposits or of metal wastage. Metallographic and microprobe analysis revealed shallow internal attack, primarily oxidation, with some slight sulfide penetration. Differences in corrosive attack between alloys was minimal. The sulfidation attack on the tubes wasmore » not significant. Possible reasons for this are discussed. (JSR)« less