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Research Papers: Materials and Fabrication

Methodology for Stress-Controlled Fatigue Test Under In-Air and Pressurized Water Reactor Coolant Water Condition and to Evaluate the Effect of Pressurized Water Reactor Water and Loading Rate on Ratcheting

[+] Author and Article Information
Bipul Barua, Joseph T. Listwan, Saurindranath Majumdar, Krishnamurti Natesan

Argonne National Laboratory,
Lemont, IL 60439

Subhasish Mohanty

Argonne National Laboratory,
Lemont, IL 60439
e-mail: smohanty@anl.gov

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received November 20, 2017; final manuscript received January 30, 2018; published online April 4, 2018. Assoc. Editor: Steve J. Hensel.The United States Government retains, and by accepting the article for publication, the publisher acknowledges that the United States Government retains, a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this work, or allow others to do so, for United States government purposes.

J. Pressure Vessel Technol 140(3), 031403 (Apr 04, 2018) (7 pages) Paper No: PVT-17-1236; doi: 10.1115/1.4039345 History: Received November 20, 2017; Revised January 30, 2018

This work investigates the behavior of 316 stainless steel (SS) under stress-controlled low cycle fatigue loading. Several fatigue experiments are conducted under different environment such as in air at 300 °C and primary loop water conditions for a pressurized water reactor (PWR). Two different loading conditions are also employed to examine the effect of stress rate on material hardening and ratcheting. During PWR water test, actuator position measurements are used to determine the strain of the specimen. Under PWR environment, 316 SS is found to ratchet to a significantly greater degree compared with in air. At slow stress rate, higher amount of cyclic hardening is observed in 316 SS, and slow stress rate increases the rate of ratcheting. Results also indicate that 316 SS exhibits asymptotic strain response at higher stress loading which can cause material to behave very differently under same stress cyclic loading.

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References

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Figures

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Fig. 9

Comparison of ratcheting strain during variable-amplitude loading of ET-F43 and ET-F45

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Fig. 8

Observed strain during ET-F45

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Fig. 12

Predicted engineering strain from actuator position data during EN-F46

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Fig. 10

Actual strain measured by strain gauge versus predicted strain regenerated from position data of ET-F43 during (a) variable-amplitude and (b) constant-amplitude loading

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Fig. 11

Predicted engineering strain from actuator position data during EN-F44

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Fig. 7

Mean true stress during (a) variable-amplitude and (b) constant-amplitude loading of ET-F43

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Fig. 6

Observed strain during ET-F43

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Fig. 5

Stress input during ET-F45 (in-air) and EN-F46 (PWR)

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Fig. 4

Stress input during ET-F43 (in-air) and EN-F44 (PWR)

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Fig. 3

(a) PWR environmental test loop fatigue test frame with pipe autoclave; (b) LabVIEW screen sort showing the schematic of autoclave, test specimen, and location of thermocouples with instantaneous reading at a typical instance; and (c) disassembled autoclave

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Fig. 2

LabVIEW screen shot showing the schematic of various components of PWR environment test loop

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Fig. 1

(a) In-air fatigue test frame along with induction heating coil; (b) LEPEL induction heating system; and (c) close view of induction heating coil, specimen, and extensometer

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Fig. 13

Normalized engineering strain versus fatigue cycles during constant-amplitude loading of (a) in-air and (b) PWR environment tests

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Fig. 14

Normalized ratcheting strain versus fatigue cycles during constant-amplitude loading

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Fig. 15

Comparison of ratcheting strain during variable-amplitude loading of in-air tests (ET-F43 and ET-F45) and PWR tests (EN-F44 and EN-F46)

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