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Research Papers: Design and Analysis

Effect of Autofrettage in the Thick-Walled Cylinder With a Radial Cross-Bore

[+] Author and Article Information
Hongjun Li, Richard Johnston, Donald Mackenzie

Department of Mechanical Engineering, University of Strathclyde, Glasgow G1 1XJ, UK

J. Pressure Vessel Technol 132(1), 011205 (Jan 04, 2010) (5 pages) doi:10.1115/1.3152230 History: Received August 08, 2007; Revised November 16, 2008; Published January 04, 2010; Online January 04, 2010

The effect of autofrettage on the stress level in thick-walled cylinders with a radial cross-bore is investigated by applying inelastic finite element analysis with cyclic pressure loading. A macro is created in ANSYS to calculate the equivalent alternating stress intensity, Seq, based on the ASME Boiler and Pressure Vessel Code. The value of Seq is used to evaluate the fatigue life of the vessel. For a specific cyclic load level, a distinct optimum autofrettage pressure is identified by plotting autofrettage pressure against the number of cycles from design fatigue data. The fatigue life of the autofrettaged vessel with such an optimum pressure is significantly increased compared with the case where no autofrettage is used.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Fluctuating stress pattern

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Figure 2

The thick-walled cylinder with a radial cross-bore

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Figure 3

Finite element analysis model

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Figure 4

Variation of Seq with Pauto, b/a=1.75, and c/a=0.2

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Figure 5

Variation of Nf with Pauto, b/a=1.75, and c/a=0.2

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Figure 6

Variation of Seq with Pauto for b/a=1.5

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Figure 7

Variation of Seq with Pauto for b/a=1.75

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Figure 8

Variation of Seq with Pauto for b/a=2

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Figure 9

Variation of Seq with Pauto for c/a=0.05

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Figure 10

Variation of Seq with Pauto for c/a=0.1

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Figure 11

Variation of Seq with Pauto for c/a=0.15

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Figure 12

Variation of Seq with Pauto for c/a=0.2

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Figure 13

Variation of Seq with Pauto for c/a=0.25

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Figure 14

Fatigue life comparison for b/a=1.5

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Figure 15

Fatigue life comparison for b/a=1.75

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Figure 16

Fatigue life comparison for b/a=2

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