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Research Papers: Design and Analysis

Elastic-Route Estimation of Strain Range in Notched Components Under Thermal Loading Without Performing Stress Linearization

[+] Author and Article Information
Terutaka Fujioka

Mem. ASME
Faculty of Science and Engineering,
Department of Mechanical Engineering,
Toyo University,
2100 Kujirai, Kawagoe,
Saitama 350-8585, Japan
e-mail: fujioka@toyo.jp

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received January 22, 2014; final manuscript received April 7, 2014; published online October 15, 2014. Assoc. Editor: Albert E. Segall.

J. Pressure Vessel Technol 137(2), 021205 (Oct 15, 2014) (6 pages) Paper No: PVT-14-1008; doi: 10.1115/1.4027418 History: Received January 22, 2014; Revised April 07, 2014

In this paper, a simplified method is proposed for estimating the strain range produced in notched components under thermal loading for the purpose of assessing fatigue, creep, and creep-fatigue life consumptions. The proposed method is based on the previously proposed stress redistribution locus (SRL) and elastic follow-up factor, which are combined with a new method for evaluating the primary-plus-secondary stress limit. The proposed method does not require the linearization of stresses and was validated by performing elastic-plastic finite element analysis (FEA) of notched components subjected to cyclic thermal loading.

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Figures

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Fig. 1

Schematic illustration of relationship between nonlinear stress distribution and equivalent bending stress

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Fig. 2

Thermally loaded cylinder for sample numerical analyses (mechanical and thermal boundary conditions, dimensions in mm)

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Fig. 3

Finite element mesh subdivisions of analyzed cylinder

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Fig. 4

Thermal loading applied to cylinder in elastic-plastic FEA

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Fig. 5

Comparison of total strain ranges obtained by elastic-plastic FEA and simplified methods (notch radius = 10 mm)

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Fig. 6

Comparison of total strain ranges obtained by elastic-plastic FEA and simplified methods (notch radius = 5 mm)

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