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Research Papers: Design and Analysis

Experimental and Numerical Studies on Inelastic Dynamic Behavior of Stainless Steel Elbow Under Harmonic Base Excitation

[+] Author and Article Information
A. Ravi Kiran

Reactor Safety Division,
Bhabha Atomic Research Centre,
Mumbai 400085, India
e-mail: arkiran@barc.gov.in

G. R. Reddy

Reactor Safety Division,
Bhabha Atomic Research Centre,
Mumbai 400085, India
e-mail: rssred@barc.gov.in

M. K. Agrawal

Reactor Safety Division,
Bhabha Atomic Research Centre,
Mumbai 400085, India
e-mail: mkagra@barc.gov.in

1Present address: Room No. 412, Engg. Hall-7, BARC, Trombay, Mumbai 400085, India.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received October 24, 2017; final manuscript received January 13, 2018; published online February 22, 2018. Assoc. Editor: Akira Maekawa.

J. Pressure Vessel Technol 140(2), 021204 (Feb 22, 2018) (9 pages) Paper No: PVT-17-1211; doi: 10.1115/1.4039126 History: Received October 24, 2017; Revised January 13, 2018

In the present work, inelastic dynamic behavior of a pressurized stainless steel elbow is studied under harmonic base excitation with the emphasis on strain accumulation known as ratcheting. Initially, sine sweep test is carried out on the long radius stainless steel (SS 304L) elbow to evaluate the free vibration characteristics. Then, incremental harmonic base excitation with the first resonant frequency is applied to the elbow till failure and the resulting response is studied. The tested elbow is analyzed using a simplified method and the simulated ratcheting strain is compared with experimental results. The effect of thickness variation in the elbow on strain accumulation is also studied. Levels of base excitation corresponding to different failure criteria are evaluated and the details are provided in the paper.

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References

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Figures

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Fig. 1

Schematic of test setup of elbow

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Fig. 2

Photograph of test setup of elbow

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Fig. 3

Input base acceleration history

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Fig. 4

Acceleration history of lumped mass

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Fig. 5

Hoop strain time history at flank of elbow (SG-1H)

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Fig. 6

Peak hoop strain accumulation for SG-1H at flank of elbow for different levels of base excitation

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Fig. 7

Hoop strain time history at flank of elbow (SG-3H)

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Fig. 8

Peak hoop strain accumulation for SG-3H at flank of elbow for different levels of base excitation

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Fig. 9

Axial strain time history at flank of elbow (SG-2A)

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Fig. 10

Axial strain time history at flank of elbow (SG-4A)

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Fig. 11

Finite element model of elbow

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Fig. 12

Thickness variation in the elbow

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Fig. 13

Load line displacement time history at the free end of the elbow model

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Fig. 14

Comparison of Chaboche model with experimental stabilized hysteresis loop

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Fig. 15

Moment-rotation hysteresis loops for the elbow with uniform thickness

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Fig. 16

Moment-rotation hysteresis loops for the elbow with thickness variation

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Fig. 17

Moment-rotation hysteresis loops and cyclic strain-moment-rotation curves for the elbow

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Fig. 18

Finite element model of elbow with springs

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Fig. 19

Response spectrum for harmonic excitation with amplitude of 0.2 g

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Fig. 20

Comparison of predicted strain accumulation at flank of the elbow with test results

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Fig. 21

Extrapolation of test results for evaluation of excitation level corresponds to 5% strain accumulation

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