Research Papers: Design and Analysis

Ballooning Deformation of Zircaloy-4 Fuel Sheath

[+] Author and Article Information
Mohd. Kaleem Khan, Manabendra Pathak

Department of Mechanical Engineering,
Indian Institute of Technology Patna,
Patliputra Colony,
Patna, Bihar 800 013, India

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received January 29, 2013; final manuscript received November 24, 2013; published online February 27, 2014. Assoc. Editor: Spyros A. Karamanos.

J. Pressure Vessel Technol 136(3), 031206 (Feb 27, 2014) (12 pages) Paper No: PVT-13-1023; doi: 10.1115/1.4026146 History: Received January 29, 2013; Revised November 24, 2013

In this paper, both experimental and analytical investigations have been conducted to investigate the fuel sheath (also known as clad tube) ballooning deformation and subsequent bursting. The work has been performed to simulate ballooning deformation of fuel sheaths under different heating rates and internal pressures in an inert atmosphere. An experimental setup has been designed to capture the temperature, pressure, and wall displacement data during the ballooning deformation of the sheath specimen. Also, a computer code in MATLAB has been developed to compute the stresses and strains at the ballooning site of the fuel sheath. The developed model has been validated with present and past experimental studies. A parametric study has also been conducted to study the effect of internal pressure, heating rate, and sheath dimensions on hoop or circumferential strain.

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Fig. 1

Schematic diagram of experimental set-up

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Fig. 2

Schematic diagram of clad tube undergoing ballooning deformation (b) an axisymmetric thin revolution shell (c) stresses on infinitesimal element on shell surface (Wright [8])

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Fig. 3

Relation between R, d and (r-r′)

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Fig. 5

Video snapshots of ballooned sheath specimen at different time levels for po = 20.2 bar, η = 68.7 K/s, TB = 909.4 °C

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Fig. 6

Video snapshots of ballooned sheath specimen at different time levels for po = 59.6 bar, η = 40.3 K/s, TB = 670.8 °C

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Fig. 7

Effect of heating rate on sheath bursting

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Fig. 8

Effect of internal pressure on sheath bursting

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Fig. 9

Validation of the proposed model with our own experimental data

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Fig. 10

Validation of present model with Lin's model [5] and experimental data of Garde et al. [10]

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Fig. 11

Effect of heating rate on circumferential strain

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Fig. 12

Effect of internal pressure on circumferential strain

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Fig. 13

Effect of tube dimensions on the circumferential strain




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