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Research Papers: Materials and Fabrication

Damage Caused by Dynamic/Cyclic Loading of a Detonation Chamber

[+] Author and Article Information
Yasuhito Takashima

e-mail: takasima@mapse.eng.osaka-u.ac.jp

Fumiyoshi Minami

Osaka University,
Osaka 565-0871, Japan

Michel H. Lefebvre

Royal Military Academy,
Brussels 1000, Belgium

Robert E. Nickell

Applied Science & Technology,
San Diego, CA 92103

Joseph K. Asahina

Kobe Steel Ltd.,
Kobe 657-0845, Japan

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the Journal of Pressure Vessel Technology. Manuscript received November 4, 2012; final manuscript received January 30, 2013; published online June 11, 2013. Assoc. Editor: Kunio Hasegawa.

J. Pressure Vessel Technol 135(4), 041404 (Jun 11, 2013) (7 pages) Paper No: PVT-12-1167; doi: 10.1115/1.4023733 History: Received November 04, 2012; Revised January 30, 2013

The plastic damage caused by multiple dynamic loading and its influence on the ductility and toughness of 3.5% Ni steel (SA203E) and C steel (SA516M) were examined for the discussion of integrity design of detonation chambers. V-notched specimens and hourglass specimens were welded on the 1/7-scale model of a 1-ton explosive class detonation chamber and subjected to 30 detonation shots. It has been indicated that 30 detonation shots caused prestrain in the specimens. The ductility was reduced by the prestrain. The Charpy impact toughness was affected as well in a lower temperature. It has been noted that the damage is developed with fatigue crack growth at the notch root of the V-notched specimen.

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References

Figures

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Fig. 1

Configuration of test specimens: (a) type-A specimen, (b) type-B specimen, and (c) type-C specimen

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Fig. 2

Position of test pieces attached on the detonation chamber

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Fig. 3

Explosive mass at each detonation shot

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Fig. 4

Peak strain at each shot and cumulated residual strain on the chamber wall

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Fig. 5

Schematic illustration of type-B specimen deformed after shots

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Fig. 6

Schematic illustration of type-A and type-C specimens deformed after shots

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Fig. 7

Vickers hardness distribution near V-notch root in type-C specimen: (a) SA203E and (b) SA516M

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Fig. 8

Crack initiated at notch bottom in type-C specimen: (a) SA203E and (b) SA516M

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Fig. 9

Fracture appearance of type-A specimen: (a) SA203E and (b) SA516M

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Fig. 10

Striations on crack surface of SA203E

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Fig. 11

Configuration of miniature size tension specimen

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Fig. 12

Extraction of miniature size tension specimen from type-B specimen

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Fig. 13

Nominal stress–nominal strain curves obtained by tension tests: (a) SA203E and (b) SA516M

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Fig. 14

True stress–true strain curve: (a) SA203E and (b) SA516M

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Fig. 15

Configuration of Charpy specimen

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Fig. 16

Effect of dynamic prestrain on ductility of Charpy specimen: (a) SA203E and (b) SA516M

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Fig. 17

Effect of dynamic prestrain or machined wire notch on Charpy absorbed energy: (a) SA203E and (b) SA516M

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Fig. 18

Configuration of machined notch in Charpy specimen

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Fig. 19

Crack surface of SA203E

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Fig. 20

Strain amplitude in type-A specimen at 24th shot

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