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Research Papers: Design and Analysis

Fracture Mode Transition for Explosively Loaded GB/JB 20 Steel Containment Vessels

[+] Author and Article Information
Ma Li, Hu Yang, Du Yang, Zheng Jinyang

Institute of Process Equipment,
Zhejiang University,
Hangzhou 310027, China

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received February 1, 2012; final manuscript received January 17, 2014; published online February 27, 2014. Assoc. Editor: Hardayal S. Mehta.

J. Pressure Vessel Technol 136(3), 031203 (Feb 27, 2014) (9 pages) Paper No: PVT-12-1016; doi: 10.1115/1.4026578 History: Received February 01, 2012; Revised January 17, 2014

A rupture experiment was conducted on cylindrical explosion containment vessels (ECVs), where the fracture mode transition was observed. Microstructure examinations indicate the material GB/JB20 (AISI 1020) experienced a fibrous-to-cleavage fracture mechanism transition with increment of loading rate. Different from fracture mechanics method, a rate-dependent failure criterion is proposed to account for the dynamic fracture behavior, which is compatible with experimental observation that the material fails at low effective plastic strain when at high strain rates. A finite element analysis of a cylindrical containment vessel with different sizes of initial cracks was performed, where the overpressure caused by detonation was calculated, and the dynamic crack propagation and fracture mode transition were reproduced. In addition, a failure assessment including the estimation of limiting crack sizes corresponding to impulsive loading was conducted. It was found that a small variation of initial crack size has minor influence on the final fracture mode and profile, which is mainly dependent upon the intensity of impulsive load as well as the loading rate. The results also indicate that the crack propagates with strongly nonlinear speeding, most cracking length developed during the first structural vibration cycle.

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Figures

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Fig. 1

Tube fracture under static and detonation loading conditions [14], (a) static hydraulic experiment, and (b) detonation loading

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Fig. 2

Experimental device

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Fig. 3

Mixed fibrous-cleavage fracture

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Fig. 5

Finite element model for overpressure analysis

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Fig. 6

Overpressure comparison

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Fig. 7

Failure analysis model

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Fig. 8

Finite element model with crack

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Fig. 9

Rate-dependent failure criterion

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Fig. 10

Crack propagation with 250 g TNT, (a) t = 45 μs, (b) t = 120 μs, (c) t = 270 μs, (d) t = 645 μs, (e) t = 1020 μs, and (f) t = 1685 μs

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Fig. 11

Crack propagation with 425 g TNT, (a) t = 45 μs, (b) t = 85 μs, (c) t = 150 μs, (d) t = 270 μs, (e) t = 560 μs, (f) t = 1015 μs, (g) t = 1685 μs, and (h) experimental fracture profile

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Fig. 12

Crack propagation with 600 g TNT, (a) t = 45 μs, (b) t = 75 μs, (c) t = 95 μs, (d) t = 130 μs, (e) t = 170 μs, (f) t = 670 μs, (g) t = 1685 μs, and (h) experimental fracture profile

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Fig. 13

Crack propagation with 250 g TNT

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Fig. 14

Crack propagation with 425 g TNT

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Fig. 15

Crack propagation with 600 g TNT

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