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Research Papers: Design and Analysis

Evaluation of Cumulative Damage in a Series of Sequential Load Events

[+] Author and Article Information
Woo-Seok Choi

Korea Atomic Energy Research Institute,
1045 Daedeokdaero, Yuseong,
Daejeon 305-600, Korea
e-mail: wschoi@kaeri.re.kr

Ki-Seog Seo

Korea Atomic Energy Research Institute,
1045 Daedeokdaero, Yuseong,
Daejeon 305-600, Korea

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received December 17, 2012; final manuscript received November 13, 2013; published online January 29, 2014. Assoc. Editor: Allen C. Smith.

J. Pressure Vessel Technol 136(2), 021205 (Jan 29, 2014) (7 pages) Paper No: PVT-12-1195; doi: 10.1115/1.4026047 History: Received December 17, 2012; Revised November 13, 2013

During the safety assessments of transport packages, cumulative damages are naturally accumulated for assessments performed using physical tests specimens. However, such cumulative damages are not as easily accounted for when assessments are made through numerical simulations. While analysts are comfortable with simulating packages for single events, it is not yet common practice to incorporate the effect handed over from a former event to the next, in a series of sequential load events. Thus, many numerical simulations in a safety analysis report (SAR) represent just a single event in a series of sequential events comprising the required accident conditions. These single event numerical simulations are then based on the initial conditions that differ from the analogous physical test specimen, which could contribute to a growing disparity in the results between assessments through physical testing compared to a numerical simulation. The reason why analyses do not consider the cumulative damage is difficulties in delivering the final results of the previous analysis to the current analysis. The hypothetical accident conditions described in the International Atomic Energy Agency (IAEA) regulations include drop, puncture, fire, and water immersion conditions, which should be sequentially simulated. There can be cumulative damage between two accident conditions, such as drop and puncture, puncture and fire, and so forth. In this study, as the first step to consider cumulative damage, an analysis technology to perform a puncture analysis incorporating the final response field from a prior drop analysis is proposed. The necessity and validity of the proposed analysis technology are evaluated through a comparison with the results obtained by performing each analysis independently.

Copyright © 2014 by ASME
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References

Figures

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Fig. 1

Cumulative damage flow stream and available evaluation techniques

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Fig. 2

Drop analysis and puncture analysis conducted after a drop analysis

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Fig. 3

Comparison of deformations after the sequentially performed drop and puncture analyses and after a puncture analysis only

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Fig. 4

Installation of the strain gauge and comparison of the deformations between the sequential drop test and puncture-only test

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Fig. 5

Strain histories during a drop in the sequential test

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Fig. 6

Strain histories during a puncture in the sequential test

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Fig. 7

Strain histories during the sequential test

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Fig. 8

Strain histories during the puncture-only test

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Fig. 9

Strain histories during the puncture-only test

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Fig. 10

Comparison of the strain histories @ #1 during a drop test and drop analysis

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Fig. 11

Comparison of the strain histories @ #1 during a puncture test and puncture analysis

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Fig. 12

One-third scaled test model of a dual metal cask

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Fig. 13

Strain histories during the side drop in the sequential analysis (surface of the cask)

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Fig. 14

Strain histories during the side puncture in the sequential analysis (surface of the cask)

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Fig. 15

Installation of the strain gauge and accelerometers

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Fig. 16

Strain histories during the side drop test

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Fig. 17

Strain histories during the side puncture test

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