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Research Papers: Design and Analysis

Proposal of Failure Mode Map Under Dynamic Loading—Ratcheting and Collapse

[+] Author and Article Information
Md Abdullah Al Bari

Nuclear Engineering and Management,
School of Engineering,
The University of Tokyo,
7-3-1 Hongo, Bunkyo-ku,
Tokyo 113-8656, Japan
e-mail: md.abdullahbari@gmail.com

Ryota Sakemi

Nuclear Engineering and Management,
School of Engineering,
The University of Tokyo,
7-3-1 Hongo, Bunkyo-ku,
Tokyo 113-8656, Japan
e-mail: ryou.basket@gmail.com

Yamato Katsura

Nuclear Engineering and Management,
School of Engineering,
The University of Tokyo,
7-3-1 Hongo, Bunkyo-ku,
Tokyo 113-8656, Japan
e-mail: p0cky@hotmail.co.jp

Naoto Kasahara

Nuclear Engineering and Management,
School of Engineering,
The University of Tokyo,
7-3-1 Hongo, Bunkyo-ku,
Tokyo 113-8656, Japan
e-mail: kasahara@n.t.u-tokyo.ac.jp

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received January 8, 2017; final manuscript received July 7, 2018; published online August 2, 2018. Assoc. Editor: San Iyer.

J. Pressure Vessel Technol 140(5), 051202 (Aug 02, 2018) (8 pages) Paper No: PVT-17-1006; doi: 10.1115/1.4040892 History: Received January 08, 2017; Revised July 07, 2018

Ratcheting, collapse, and fatigue are the probable failure modes which can occur under alternate dynamic loading like seismic loading. The objective of this study is to propose a failure mode map for rectangular beams by determining the conditions of occurrence of the ratcheting and collapse failure modes. The paper considers the analogy between thermal ratcheting and dynamic ratcheting. The nonlinear dynamic finite element method was used to analyze a rectangular beam model for different loading conditions. The results were plotted on a nondimensional primary and secondary stress parameter graph similar to the Bree diagram for thermal ratcheting. The similarity between thermal load and dynamic load was observed. The main difference between thermal and dynamic loading is the effect of the frequency of dynamic loading on the occurrence of ratcheting and collapse. Experimental observations of ratcheting have been obtained and are used for comparison to validate the analytical predictions. From the above results, a failure mode map has been proposed which can evaluate the occurrence conditions of ratcheting and collapse under dynamic loadings.

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Figures

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Fig. 1

Analogy between thermal and dynamic ratcheting

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Fig. 2

Finite element model for ratchet analyses

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Fig. 3

Typical strain response in the presence of ratcheting

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Fig. 4

Proposed ratchet diagram

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Fig. 5

Amplification factor

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Fig. 6

The effect of dynamic response in ratchet diagram

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Fig. 7

Configuration of plate-shaped specimen for experiment

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Fig. 8

Experimental setup

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Fig. 9

Typical base acceleration input in the shaking table

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Fig. 10

Typical strain response of occurrence of ratcheting

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Fig. 11

Comparison of measured and predicted results in X, Y graph

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Fig. 12

Input acceleration for collapse analysis

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Fig. 13

Proposed collapse diagram

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Fig. 14

Amplification factor at higher frequency

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Fig. 15

Typical strain response in the presence of collapse

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Fig. 16

Failure mode map for ratcheting and collapse

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