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Research Papers: Codes and Standards

Assessment of the Cyclic Behavior of Structural Components Using Novel Approaches

[+] Author and Article Information
K. D. Panagiotou

Department of Civil Engineering,
Institute of Structural Analysis
and Antiseismic Research,
National Technical University of Athens,
Zografou Campus,
Athens 157-80, Greece
e-mail: kdpanag@gmail.com

K. V. Spiliopoulos

Department of Civil Engineering,
Institute of Structural Analysis
and Antiseismic Research,
National Technical University of Athens,
Zografou Campus,
Athens 157-80, Greece
e-mail: kvspilio@central.ntua.gr

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received July 2, 2015; final manuscript received November 24, 2015; published online April 28, 2016. Assoc. Editor: Kunio Hasegawa.

J. Pressure Vessel Technol 138(4), 041201 (Apr 28, 2016) (10 pages) Paper No: PVT-15-1144; doi: 10.1115/1.4032199 History: Received July 02, 2015; Revised November 24, 2015

To extend the life of a structure, or a component, which is subjected to cyclic thermomechanical loading history, one has to provide safety margins against excessive inelastic deformations that may lead either to low-cycle fatigue or to ratcheting. Direct methods constitute a convenient tool toward this direction. Two direct methods that have been named residual stress decomposition method (RSDM) and residual stress decomposition method for shakedown (RSDM-S) have recently appeared in the literature. The first method may predict any cyclic elastoplastic state for a given cyclic loading history. The second method RSDM-S that is based upon RSDM is suggested for the shakedown analysis of structures. Both methods may be directly implemented in any finite-element (FE) code. An elastic perfectly plastic material with a von Mises yield surface has been assumed. In this work, through their application to structures that are used as benchmarks in the literature, both methods, applied together, prove their efficiency and capacity to determine shakedown boundaries and reveal unsafe conditions.

Copyright © 2016 by ASME
Topics: Stress
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References

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Figures

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Fig. 1

(a) Structure with applied thermomechanical loads and (b) cyclic loading state

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Fig. 2

Estimation of the plastic strain rate

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Fig. 3

Proportional cyclic loading variation over one time period in (a) load space and (b) time domain

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Fig. 4

Geometry, loading, and FE mesh for the Bree problem

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Fig. 5

Different cyclic loading paths

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Fig. 6

The elastic shakedown and ratchet limits for the Bree cylinder (load path 1)

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Fig. 7

Predicted cyclic steady-state distribution of the yy component of the stress vector σplcs(t) at GP1 (load case 1—reverse plasticity)

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Fig. 8

Predicted cyclic steady-state distribution of the yy component of the stress vector σplcs(t) at GP1 (load case 2—ratcheting R2)

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Fig. 10

The elastic shakedown and ratchet limits for the Bree cylinder (load path 2)

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Fig. 9

Predicted cyclic steady-state distribution of the yy component of the stress vector σplcs(t) at GP1 (load case 3—ratcheting R1)

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Fig. 11

The geometry, loading, and the FE mesh of a quarter of a plate

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Fig. 12

The elastic shakedown and ratchet limits for the holed plate (load path 1)

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Fig. 13

The shakedown and ratchet limits for the holed plate (load path 2)

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Fig. 14

Predicted cyclic steady-state distribution of the xx component of the stress vector σplcs(t) at GP1 (load case 1—reverse plasticity)

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Fig. 15

Local reverse plasticity for load case 1

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Fig. 16

Predicted cyclic steady-state distribution of the xx component of the stress vector σplcs(t) at GP1 (load case 2—ratcheting)

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Fig. 17

Incremental collapse mechanism for load case 2

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Fig. 18

Predicted cyclic steady-state distribution of the xx component of the stress vector σplcs(t) at GP1 (load case 3—ratcheting)

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Fig. 19

Predicted cyclic steady-state distribution of the yy component of the stress vector σplcs(t) at GP2 (load case 4—reverse plasticity)

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Fig. 20

Predicted cyclic steady-state distribution of the xx component of the stress vector σplcs(t) at GP1 (load case 5—ratcheting)

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Fig. 21

Predicted cyclic steady-state distribution of the xx component of the stress vector σplcs(t) at GP1 (load case 4′—ratcheting)

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