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Research Papers: Materials and Fabrication

New Ring Specimen Geometries for Determining the Failure Locus of Tubulars

[+] Author and Article Information
M. A. Al-Khaled

Department of Mechanical Engineering,
The Petroleum Institute,
Khalifa University of Science and Technology,
P.O. Box 2533,
Abu Dhabi, United Arab Emirates

I. Barsoum

Department of Mechanical Engineering,
The Petroleum Institute,
Khalifa University of Science and Technology,
P.O. Box 2533,
Abu Dhabi, United Arab Emirates
e-mail: ibarsoum@pi.ac.ae

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received August 18, 2017; final manuscript received October 18, 2017; published online December 5, 2017. Assoc. Editor: Kiminobu Hojo.

J. Pressure Vessel Technol 140(1), 011405 (Dec 05, 2017) (13 pages) Paper No: PVT-17-1159; doi: 10.1115/1.4038311 History: Received August 18, 2017; Revised October 18, 2017

Pressure vessels designed in accordance with the ASME BPVC code are protected against local ductile failure. Recent work has shown that local ductile failure highly depends on the stress state characterized by both stress triaxiality (T) and the Lode parameter (L). In this paper, the effect of stress state on the ductility of a tubular steel is studied. Two ring specimen configurations were optimized to allow the determination of the ductile failure locus at both tensile and plane strain loadings. The geometry of both ring specimen configurations was optimized to achieve a plane strain (L=0) condition and a generalized tension (L=-1) condition. Notches with different radii were machined on both types to achieve a wide range of stress triaxiality. Specimens were manufactured from SA-106 carbon tubular steel and were tested to determine the ductile failure loci as a function of T and L. Failure locus of SA-106 steel was constructed based on the failure instants and was found to be independent of the Lode parameter. The ASME-BPVC local failure criterion showed close agreement with experimental results (EXP).

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References

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Figures

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Fig. 3

General geometry of the ring specimen (un-notched) and the finite element model

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Fig. 2

True stress–strain curve for SA-106 Gr. B steel

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Fig. 1

Ring hoop tensile test experimental setup

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Fig. 4

Model of TS ring specimen alternatives with a close up of alternatives (a) TS 1, (b) TS 2, and (c) TS 3

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Fig. 14

(a) Rotation versus strain during a PS test, (b), and (c) comparison between strains at the center of the specimen (e25) and sides (e14 and e36)

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Fig. 15

Comparison of force F versus strain e25 between experiment and FEA

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Fig. 5

Illustration of path lines used for parametric optimization study of the TS alternatives

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Fig. 18

Failure locus for all SA-106 specimens with the ASME-BPVC failure locus

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Fig. 16

Stress triaxiality (T) versus equivalent plastic strain (εp)with experimental failure results for (a) TS ring and uniaxial specimens and (b) PS ring specimens

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Fig. 17

Failure locus for (a) TS ring and uniaxial specimens (L = −1) and for (b) PS ring specimens (L = 0)

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Fig. 6

Force F versus D-block displacement δ and stress triaxiality and the Lode parameter path plots through net-section thickness (ξ) and width (η) for the 3 mm radius specimens from (a) alternative TS 1, (b) alternative TS 2, and (c) alternative TS 3

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Fig. 7

The Lode parameter versus equivalent plastic strain evaluated at the center of the notch (ξ=η=0) for all specimens of (a) alternative TS 1, (b) alternative TS 2, (c) alternative TS 3, and (d) triaxiality versus equivalent plastic strain for alternative TS 3

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Fig. 8

Optimal tensile ring specimen (alternative TS 3)

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Fig. 9

Dimensions of the optimal plain strain specimen (PS)

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Fig. 10

(a) Force F versus D-block displacement δ, (c) stress triaxiality, and (d) the Lode parameter path plots through net-section thickness (ξ) and width (η) for the optimum plain strain specimens PS with notch radius ρ = 3 mm

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Fig. 11

The plain strain ring specimen PS

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Fig. 12

Experimental setup

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Fig. 13

Ring specimens: (a) TS (L = −1) and (b) PS (L = 0) with notch radius ρ =1, 3, 6, and 24 mm

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Fig. 19

Fractographical examination of SA-106 fracture surfaces of (a) tensile (L = −1) and (b) plane strain (L = 0) ring specimens

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