Report on FY 2020 Testing in Support of the Development and Extension of ASME Code Rules for Grade 91

Wang, Yanli; Hou, Peijun; Jetter, Robert I.; Sham, Sam

doi:10.2172/1649015

Cited by 2 publications

(5 citation statements)

References 12 publications

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Section: Elastic Follow-upmentioning

confidence: 99%

“…Previous work [2,[6][7][8][9][10][11][12] developed the SMT methodology to quantify the effect follow up effect on creep-fatigue life directly from experiments. Details of several different types of SMT specimens can be found in previous ART sponsored work [6][7][8][9][10][11][12]. In summary, the SMT specimens are designed to apply a global elastic follow up to a test section using either a stiffer driver section or an artificial control system while the whole system is subjected to a strain-controlled creep-fatigue loading.…”

Section: Elastic Follow-upmentioning

confidence: 99%

“…A third advantage of the EPP+SMT method is it explicitly accounts for the effect of elastic follow up in the creep-fatigue design procedure. It uses the results of SMT tests, developed through extensive research and development work [2,[6][7][8][9][10][11][12][13], to evaluate the elastic follow up on cyclic creepfatigue life. Elastic follow up is a reduction in the rate of stress relaxation, compared to fullystrain controlled relaxation, caused by stored elastic energy elsewhere in the mechanical system that tends to increase the development of creep-fatigue damage and decrease the component cyclic life.…”

Section: Introductionmentioning

confidence: 99%

“…These results are from transient heat transfer analyses of the system considering kaowool for the thermal insulation. The convective heat transfer coefficient considered for He is 2000 W/m 2 K, an approximate value from[12].…”

mentioning

confidence: 99%

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Draft Rules for Alloy 617 Creep-Fatigue Design Using an EPP+SMT Approach

Barua

Messner

Wang

et al. 2021

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The report describes an improved new creep-fatigue design method for structural components in high temperature nuclear service. The new method uses an integrated elastic-perfectly plastic (EPP) analysis and Simplified Model Test (SMT) approach that greatly simplifies the design process by avoiding the separate evaluation of creep and fatigue damages and eliminating the requirement of stress classification. The report includes draft design rules, presented in a format compatible with an ASME nuclear Code Case, as well as a commentary on the rules and the validation of the rules using pressurized SMT (p-SMT) test data. Areas of potential improvement have been identified for further evaluation. The report also develops EPP+SMT design charts for Alloy 617 at temperatures between 800°C and 950°C by extrapolating high strain range, short hold test data to low strain range and long hold times, typical for structural components in high temperature nuclear service. The design charts are currently limited to 10,000 cycles to avoid excessive extrapolation outside the test database. More robust alternate extrapolation procedures will be considered in future work. The report includes several verification problems comparing the new EPP+SMT design method with current ASME creep-fatigue design methods. The comparison demonstrates that the EPP+SMT method significantly reduces the over-conservatism in current methods. Finally, the report includes a fully-documented sample problem with multiple load cases detailing the application of proposed EPP+SMT design rules.

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Section: Elastic Follow-upmentioning

confidence: 99%

Section: Elastic Follow-upmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Draft Rules for Alloy 617 Creep-Fatigue Design Using an EPP+SMT Approach

Barua

Messner

Wang

et al. 2021

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“…A biaxial stress state will be introduced in tubular creep specimens by applying combinations of axial load to internal pressurization. The testing methods and testing plan are similar to what was proposed by Wang et al (2020b). The stresses introduced by various combinations of the internal pressure and the external axial load, either tensile or compressive, will allow various stress ratios to be developed in the specimen.…”

Section: Test Design and Planmentioning

confidence: 99%

Report on FY 2020 testing of Alloy 709 in support of EPP analysis

Wang

2020

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This report documents the research plans and initiation of testing in support of integrating EPP analysis methods for Alloy 709 at ORNL in FY 2020. Tests are designed and initiated to evaluate the effect of cyclic loading on the creep properties of Alloy 709. The preliminary results show that cyclic loading has an insignificant effect on the minimum creep rate, although additional tests are recommended to confirm this conclusion. A preliminary testing plan for multi-axial creep rupture has been established and the specimens are machined. Execution of the testing plan will continue in FY 2021.xii

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Report on FY 2020 Testing in Support of the Development and Extension of ASME Code Rules for Grade 91

Cited by 2 publications

References 12 publications

Draft Rules for Alloy 617 Creep-Fatigue Design Using an EPP+SMT Approach

Draft Rules for Alloy 617 Creep-Fatigue Design Using an EPP+SMT Approach

Report on FY 2020 testing of Alloy 709 in support of EPP analysis

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