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Research Papers: Materials and Fabrication

Improved Prediction Method for Estimating Notch Elastic-Plastic Strain

[+] Author and Article Information
R. Adibi-Asl1

Faculty of Engineering and Applied Science, Memorial University, St. John’s, NL, A1B 3X5, Canadareza.adibiasl@amec.com

R. Seshadri

Faculty of Engineering and Applied Science, Memorial University, St. John’s, NL, A1B 3X5, Canada

1

Present address: AMEC-NSS, 393 University Ave., Toronto, ON, Canada, M5G 1E6.

J. Pressure Vessel Technol 132(1), 011401 (Nov 10, 2009) (8 pages) doi:10.1115/1.4000371 History: Received May 22, 2009; Revised September 02, 2009; Published November 10, 2009; Online November 10, 2009

Notch stress-strain conversion (NSSC) rules are widely used to estimate nonlinear and history-dependent stress-strain behavior of the notch components or structures. This paper focuses on the estimation of stress and strain using the conventional NSSC rules and linear elastic analysis by considering the entire relaxation locus of the component during inelastic action. On the basis of local effects, net-section collapse, and reference stress, a simple method for estimating inelastic strain in the vicinity of stress concentrations is proposed. The accuracy of the method is compared with elastic-plastic finite element analysis for several notch configurations exhibiting two-dimensional and three-dimensional effects.

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Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Pseudoelastic and inelastic states of stress and strain: (a) plate with a hole and (b) strain stress curve

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Figure 2

Constraint diagram (17)

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Figure 3

Reference stress: (a) relaxation locus and (b) uniaxial stress-strain model

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Figure 4

Graphical representation of general stress-strain rule

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Figure 5

Modified curve for estimation elastic-plastic response at notch root

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Figure 6

Geometry and dimensions for (a) cylinder, (b) plate with a hole, and (c) round bar notch

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Figure 7

Finite element mesh: (a) two-dimensional modeling of the plate with a hole, (b) three-dimensional modeling of the plate with a hole, and (c) round bar notch

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Figure 8

Variation in elastic-plastic equivalent strain with equivalent stress (elastically calculated) for plate with a hole: (a) plane stress, (b) plane strain, and (c) three-dimensional

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Figure 9

Variation in elastic-plastic equivalent strain with equivalent stress (elastically calculated) for round bar notch

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Figure 10

Variation of elastic-plastic equivalent strain with equivalent stress (elastically calculated) based on different limit load methods: (a) plate with a hole (three-dimensional) and (b) round bar notch (axisymmetric)

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