Research Papers: Design and Analysis

A Noncyclic Method for Determination of Accumulated Strain in Stainless Steel 304 Pressure Vessels

[+] Author and Article Information
Gongfeng Jiang, Gang Chen

School of Mechanical and Power Engineering,
East China University of Science
and Technology,
Shanghai 200237, China

Liang Sun

China Special Equipment Inspection
and Research Institute,
Beijing 100013, China
e-mail: jgf20060724@163.com

Yiliang Zhang, Xiaoliang Jia

College of Mechanical Engineering
and Applied Electronics Technology,
Beijing University of Technology,
Beijing 100124, China

Yinghua Liu

Department of Engineering Mechanics,
Tsinghua University,
Beijing 100084, China

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received March 15, 2013; final manuscript received February 13, 2014; published online September 4, 2014. Assoc. Editor: David L. Rudland.

J. Pressure Vessel Technol 136(6), 061204 (Sep 04, 2014) (7 pages) Paper No: PVT-13-1052; doi: 10.1115/1.4026940 History: Received March 15, 2013; Revised February 13, 2014

Experimental results of uniaxial ratcheting tests for stainless steel 304 (SS304) under stress-controlled condition at room temperature showed that the elastic domain defined in this paper expands with accumulation of plastic strain. Both ratcheting strain and viscoplastic strain rates reduce with the increase of elastic domain, and the total strain will be saturated finally. If the saturated strain and corresponded peak stress of different experimental results under the stress ratio R ≥ 0 are plotted, a curve demonstrating the material shakedown states of SS304 can be constituted. Using this curve, the accumulated strain in a pressure vessel subjected to cyclic internal pressure can be determined by only an elastic-plastic analysis, and without the cycle-by-cycle analysis. Meanwhile, a physical experiment of a thin-walled pressure vessel subjected to cyclic internal pressure has been carried out to verify the feasibility and effectiveness of this noncyclic method. By comparison, the accumulated strains evaluated by the noncyclic method agreed well with those obtained from the experiments. The noncyclic method is simpler and more practical than the cycle-by-cycle method for engineering design.

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Fig. 1

Major geometry parameters (mm)

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Fig. 2

Cyclic stress–strain curve

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Fig. 3

Accumulated strain versus cyclic number curve

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Fig. 4

Relationships of elastic domain and accumulated plastic strain

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Fig. 5

Ratcheting of combined isotropic and kinematic hardening models

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Fig. 6

Elastic domain and new yield stress due to strain hardening

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Fig. 7

The saturated strain for strain rate less than 0.00002 in tests

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Fig. 8

The shakedown constitutive curve of SS304 for R ≥ 0

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Fig. 9

The structure sketch and strain gauge arrangement (mm)

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Fig. 10

Finite element model of the pressure vessel with branch pipes

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Fig. 11

Results of Mises equivalent stress of the pressure vessel with branch pipes

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Fig. 12

Results of Mises equivalent strain of the pressure vessel with branch pipes

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Fig. 13

Internal pressure P and equivalent strain curve of strain gauge No. 1

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Fig. 14

Internal pressure P and equivalent strain curve of strain gauge No. 2

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Fig. 15

Internal pressure P and equivalent strain curve of strain gauge No. 7

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Fig. 16

Results comparisons of experiment and simulation




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