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.
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October 2016
Research-Article
A Screening Method for Prevention of Ratcheting Strain Derived From Movement of Temperature Distribution
Satoshi Okajima,
Satoshi Okajima
Japan Atomic Energy Agency,
4002 Narita,
Oarai, Ibaraki 311-1393, Japan
e-mail: okajima.satoshi@jaea.go.jp
4002 Narita,
Oarai, Ibaraki 311-1393, Japan
e-mail: okajima.satoshi@jaea.go.jp
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Takashi Wakai,
Takashi Wakai
Japan Atomic Energy Agency,
4002 Narita,
Oarai, Ibaraki 311-1393, Japan
e-mail: wakai.takashi@jaea.go.jp
4002 Narita,
Oarai, Ibaraki 311-1393, Japan
e-mail: wakai.takashi@jaea.go.jp
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Masanori Ando,
Masanori Ando
Japan Atomic Energy Agency,
1 Shiraki,
Tsuruga-shi, Fukui 919-1279, Japan
e-mail: ando.masanori@jaea.go.jp
1 Shiraki,
Tsuruga-shi, Fukui 919-1279, Japan
e-mail: ando.masanori@jaea.go.jp
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Yasuhiro Inoue,
Yasuhiro Inoue
ASCEND Co., Ltd.,
3115-6 Muramatu,
Tokai-mura,
Naka-gun, Ibaraki 319-1112, Japan
e-mail: inoue.yasuhiro61@jaea.go.jp
3115-6 Muramatu,
Tokai-mura,
Naka-gun, Ibaraki 319-1112, Japan
e-mail: inoue.yasuhiro61@jaea.go.jp
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Sota Watanabe
Sota Watanabe
Mitsubishi FBR Systems,
2-34-17 Jingumae,
Shibuya-ku, Tokyo 150-0001, Japan
e-mail: sota_watanabe@mfbr.mhi.co.jp
2-34-17 Jingumae,
Shibuya-ku, Tokyo 150-0001, Japan
e-mail: sota_watanabe@mfbr.mhi.co.jp
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Satoshi Okajima
Japan Atomic Energy Agency,
4002 Narita,
Oarai, Ibaraki 311-1393, Japan
e-mail: okajima.satoshi@jaea.go.jp
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
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
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
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
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. Oct 2016, 138(5): 051204 (6 pages)
Published Online: April 29, 2016
Article history
Received:
October 6, 2015
Revised:
March 3, 2016
Citation
Okajima, S., Wakai, T., Ando, M., Inoue, Y., and Watanabe, S. (April 29, 2016). "A Screening Method for Prevention of Ratcheting Strain Derived From Movement of Temperature Distribution." ASME. J. Pressure Vessel Technol. October 2016; 138(5): 051204. https://doi.org/10.1115/1.4032989
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