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Design and Analysis

Simulation of Ductile Fracture of Multiple Flaws

[+] Author and Article Information
Kazuhiro Suga

 Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japanksuga@rs.noda.tus.ac.jp

Masanori Kikuchi

 Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japankik@me.noda.tus.ac.jp

Shota Kawasaki

 Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japankawa@me.noda.tus.ac.jp

J. Pressure Vessel Technol 134(3), 031205 (May 18, 2012) (8 pages) doi:10.1115/1.4005884 History: Received March 30, 2011; Revised October 25, 2011; Published May 17, 2012; Online May 18, 2012

The effect of the interaction of multiple flaws on ductile fracture is studied numerically by Gurson’s constitutive equation. Based on experimental results, two parallel flaw and three parallel flaw problems are simulated. Flaw coalescence does not occur in some problems but does occur in other cases. In all cases, ductile fracture processes are obtained, and the results are compared with the experimental results. The fracture pattern and load-displacement curves agree well with the experimental results. The void growth term is found to be dominant for the coalescence of flaws. The slant flaw problem and the nonuniform length flaw problem are simulated and an evaluation method for the multiple flaws problem is discussed.

Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Tensile test specimen

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Figure 2

Stress–strain curve of the tensile test

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Figure 3

FEM model of the tensile test specimen

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Figure 4

Initial imperfection of the FEM model

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Figure 5

Final fracture pattern of the tensile test

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Figure 6

Arrangement of parallel flaws in a flat plate

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Figure 7

FEM model of parallel flaws for the case in which H = 12.4 mm

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Figure 8

Simulated flaw propagation for H = 12.4 mm

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Figure 9

Hydrostatic pressure at δ = 20 mm

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Figure 10

Simulated flaw propagation for H = 22 mm

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Figure 11

Load-displacement curves for two parallel flaws

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Figure 12

Tensile test for three parallel flaws

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Figure 13

Half model of three parallel flaws

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Figure 14

Simulated flaw propagation with three flaws

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Figure 15

Load-displacement curves for three flaws

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Figure 16

Dimensions of twin flaws of different lengths

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Figure 17

FEM model of twin flaws (H = 16 mm, S = 4 mm)

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Figure 18

Fracture pattern with equivalent plastic strain

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Figure 19

Load-displacement curves for various flaw patterns

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Figure 20

Dimensions of the slanted flaw (+45 deg)

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Figure 21

Equivalent plastic strain (+45 deg, δ = 10 mm)

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Figure 22

Load-displacement curves for the slanted flaw (+45 deg)

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Figure 23

Dimensions of the slanted flaw (−45 deg)

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Figure 24

Equivalent plastic strain (−45 deg, δ = 18 mm)

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Figure 25

Load-displacement curves of the slanted flaw (− 45 deg)

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