0
Research Papers: Design and Analysis

A Screening Method for Prevention of Ratcheting Strain Derived From Movement of Temperature Distribution

[+] Author and Article Information
Satoshi Okajima

Japan Atomic Energy Agency,
4002 Narita,
Oarai, Ibaraki 311-1393, Japan
e-mail: okajima.satoshi@jaea.go.jp

Takashi Wakai

Japan Atomic Energy Agency,
4002 Narita,
Oarai, Ibaraki 311-1393, Japan
e-mail: wakai.takashi@jaea.go.jp

Masanori Ando

Japan Atomic Energy Agency,
1 Shiraki,
Tsuruga-shi, Fukui 919-1279, Japan
e-mail: ando.masanori@jaea.go.jp

Yasuhiro Inoue

ASCEND Co., Ltd.,
3115-6 Muramatu,
Tokai-mura,
Naka-gun, Ibaraki 319-1112, Japan
e-mail: inoue.yasuhiro61@jaea.go.jp

Sota Watanabe

Mitsubishi FBR Systems,
2-34-17 Jingumae,
Shibuya-ku, Tokyo 150-0001, Japan
e-mail: sota_watanabe@mfbr.mhi.co.jp

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received October 6, 2015; final manuscript received March 3, 2016; published online April 29, 2016. Assoc. Editor: David L. Rudland.

J. Pressure Vessel Technol 138(5), 051204 (Apr 29, 2016) (6 pages) Paper No: PVT-15-1222; doi: 10.1115/1.4032989 History: Received October 06, 2015; Revised March 03, 2016

In this paper, we simplify the existing method and propose a screening method to prevent thermal ratcheting strain in the design of practical components. The proposed method consists of two steps to prevent the continuous accumulation of ratcheting strain. The first step is to determine whether all points through the wall thickness are in the plastic state. This is based on an equivalent membrane stress, which comprises the primary stress and the secondary membrane stress. When the equivalent stress exceeds the yield strength in some regions of the cylinder, the axial lengths of these regions are measured for the second step. The second step is to determine whether the accumulation of the plastic strain saturates. For this purpose, we define the screening criteria for the length of the area with full section yield state. When this length is sufficiently small, residual stress is generated in the direction opposite to the plastic deformation direction. As a result of residual stress, further accumulation of the plastic deformation is suppressed, and finally shakedown occurs. To validate the proposed method, we performed a set of elastoplastic finite element method (FEM) analyses, with the assumption of elastic perfectly plastic material. Not only did we investigate about the effect of the axial length of the area with full section yield state but also we investigated about effects of spatial distribution of temperature, existence of primary stress, and radius thickness ratio.

FIGURES IN THIS ARTICLE
<>
Copyright © 2016 by ASME
Your Session has timed out. Please sign back in to continue.

References

Bree, J. , 1967, “ Elastic Plastic Behavior of Thin Tubes Subjected to Internal Pressure and Intermittent High Heat Fluxes With Application to Fast Nuclear Reactor Fuel Elements,” J. Strain Anal., 2(3), pp. 226–238. [CrossRef]
Japan Society of Mechanical Engineers, 2012, “ Codes for Nuclear Power Generation Facilities, Rules on Design and Construction for Nuclear Power Plants, Section II Fast Reactor Standards,” Japanese Society of Mechanical Engineers, Tokyo, JSME S NC2-2012 (in Japanese).
American Society of Mechanical Engineers, 2010, “ Boiler and Pressure Vessel Code Division 1 Subsection NH,” American Society of Mechanical Engineers, New York.
O'donnell, W. J. , and Porowski, J. , 1974, “ Upper Bounds for Accumulated Strains Due to Creep Ratcheting,” WRC Bull., 195, pp. 57–62.
Wada, H. , Igari, T. , and Kitade, S. , 1989, “ Prediction Method for Thermal Ratcheting of a Cylinder Subjected to Axially Moving Temperature Distribution,” Trans. Jpn. Soc. Mech. Eng., Ser. A, 55(512), pp. 985–993 (in Japanese). [CrossRef]
Wada, H. , Kaguchi, H. , Ueta, M. , Ichiyama, M. , Kimura, K. , Fukuda, Y. , and Suzuki, M. , 1993, “ Proposal of a New Estimation Method for the Thermal Ratcheting of a Cylinder Subjected to a Moving Temperature Distribution,” Nucl. Eng. Des., 139(3), pp. 261–267. [CrossRef]
Igari, T. , Ymauchi, M. , Kitade, S. , Kawasaki, K. , Wada, H. , and Kamishima, Y. , 1990, “ Ratcheting Behavior of a Cylinder Subjected to Thermal Stress Alone,” Trans. Jpn. Soc. Mech. Eng., Ser. A, 56(525), pp. 1217–1225 (in Japanese). [CrossRef]
Igari, T. , Wada, H. , and Ueta, M. , 2000, “ Mechanism-Based Evaluation of Thermal Ratcheting Due to Traveling Temperature Distribution,” ASME J. Pressure Vessel Technol., 122(2), pp. 130–138. [CrossRef]
Timoshenko, S. , and Krieger, S. W. , 1959, Theory of Plates and Shells, McGraw-Hill, New York.

Figures

Grahic Jump Location
Fig. 1

The traveling temperature model of the reactor vessel near the liquid sodium surface

Grahic Jump Location
Fig. 2

Comparison of residual stress distributions for different traveling distance

Grahic Jump Location
Fig. 3

Concepts of the screening rule

Grahic Jump Location
Fig. 4

Evaluated thermal transient

Grahic Jump Location
Fig. 5

Structural model used in the analysis

Grahic Jump Location
Fig. 6

Temperature dependence of the yield stress used in the analysis

Grahic Jump Location
Fig. 7

Accumulated plastic strain distribution (case R-1, circumferential membrane strain)

Grahic Jump Location
Fig. 8

Residual stress distribution (case R-1, circumferential membrane strain)

Grahic Jump Location
Fig. 9

Comparison of the accumulated plastic strain (effect of the length of the area with full section yield state)

Grahic Jump Location
Fig. 10

Comparison of the accumulated plastic strain (effect of the primary stress)

Grahic Jump Location
Fig. 11

Comparison of the accumulated plastic strain (effect of thickness ratio)

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In