Deformation and fragmentation behaviour of exploded metal cylinders and the effects of wall materials, configuration, explosive energy and initiated locations

Hiroe, Tetsuyuki; Fujiwara, Kazuo; Hata, Hideaki; Takahashi, Hideaki

doi:10.1016/j.ijimpeng.2008.07.002

Cited by 71 publications

(29 citation statements)

References 11 publications

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“…Most of these experimental configurations rely on the radial expansion of axially symmetric structures like rings (Niordson, 1965;Grady and Benson, 1983;Gourdin, 1989;Altynova et al, 1996;Grady and Olsen, 2003;Zhang and Ravi-Chandar, 2006;Janiszewski, 2012), tubes (Mott, 1947;Wesenberg and Sagartz, 1977;Goto et al, 2008;Hiroe et al, 2008;Zhang and Ravi-Chandar, 2010) and hemispheres (Juanicotena, 1998;Mercier et al, 2010) since complications resulting from wave propagation are eliminated due to the symmetry of the problem, which facilitates the interpretation of the experimental findings. In these tests the material stretches during loading until homogeneous deformation fails at large strain, leading to flow localization in the form of multiple necking and subsequent fragmentation.…”

Section: Introductionmentioning

confidence: 99%

On the complete extinction of selected imperfection wavelengths in dynamically expanded ductile rings

Rodríguez-Martínez

Vadillo

Zaera

et al. 2013

Mechanics of Materials

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a b s t r a c tIn this work the inception and development of multiple necks in dynamically expanded ductile rings with ab initio geometric imperfections has been addressed. Finite element simulations and linear perturbation analysis have been applied for that task. In the numerical calculations a selected wavelength is included into the model defining along the circumference of the ring an array of periodic geometric imperfections of predefined amplitude. In the stability analysis a perturbation of a given mode is added to the background solution and the growth rate of the perturbation is evaluated. The attention has been focused on the extinction of both long and short wavelength imperfections and the appearance of a dominant necking pattern which emerges when the geometric imperfections are vanished. The role played by the loading rate on the extinction of imperfections is also addressed. Moreover, the necking strain is found to be dependent on the imperfection pattern and the loading rate. Its maximum value is registered for the loading cases in which the initial imperfections distribution is completely extinguished.

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Section: Introductionmentioning

confidence: 99%

On the complete extinction of selected imperfection wavelengths in dynamically expanded ductile rings

Rodríguez-Martínez

Vadillo

Zaera

et al. 2013

Mechanics of Materials

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“…15 The largest volume of work published on expanding cylinders has focused on explosively loaded samples. [16][17][18][19][20] The material of interest is either packed with an explosive charge or can be placed on a "driver cylinder" containing the charge designed to transfer radial momentum to the sample ring or cylinder around it. 21 This can introduce a strong shock wave into the cylinder and affect material properties.…”

Section: Driving Cylinders Into Expansionmentioning

confidence: 99%

A gas gun based technique for studying the role of temperature in dynamic fracture and fragmentation

Jones

Chapman

Eakins

2013

Journal of Applied Physics

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Presented in this work is a new experimental technique to facilitate studies of materials under uniform radial expansion at rates of strain typically seen in ballistic and impact studies (10 3 to 10 5 s À1) at temperatures around 100-1000 K. Previous work places a right-cylinder polymer insert in a sample cylinder, into which a matching polymer projectile is launched using a gas gun. The impact and resulting deformation of the polymers imparts radial momentum to the cylinder. This work replaces the polymer insert with a steel ogive. A polycarbonate projectile deforms around the insert and drives radial expansion. The uniform radial expansion created has a less complex interface than previous work as only one material is driving the cylinder wall. As deformation of the insert is no longer necessary, the opportunity to heat or cool the cylinder prior to expansion is now available for studies into the effect of temperature on fracture and fragmentation behavior. This paper describes the design of this new impact configuration alongside how strain rate and expansion profile can be controlled. Validation experiment results with 6061-T6 aluminum and Ti-6Al-4V cylinders using a variety of diagnostics are compared with numerical modelling, where the benefits of this technique in assisting development of material strength and failure models are discussed with methods to control the sample temperature. [http://dx

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“…The fragmentation of shell can occur in two ways: natural and controlled fragmentation. Natural fragmentation of shell results in wide range random distributions of fragments sizes (masses and geometries), which can lead to a substantial decrease in effective fragments on the targets [8]. To obtain the fragments of desired mass and geometry, the most common technology is controlled fragmentation, which is based on grooves or notches designed on the internal and external surface of shell.…”

Section: Introductionmentioning

confidence: 99%

Influence of Localized Melting on Dynamic Fracture Behaviours of Metallic Shell

Shen

Yang

et al. 2017

Propellants Explo Pyrotec

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Abstract:The dynamic fracture behaviour of cylindrical shell preformed by localized melting technology was studied experimentally, and the microstructure and performance of melted layers were also analyzed in this paper. The results reveal that the microstructure of melted layer is predominantly needle type and refined martensite by the melted-solidification process. With the increase of hardness and decrease of impact energy absorbed, the embrittlement tendency of localized melting sample is obviously. Compared with natural fragmentation, the fragments of shell after melting are more regular, and the proportion of effective fragments is high. Due to the sensitivity of shear bands of melted layers, fracture can easily take place along the melting trajectory subjected to internal explosive loading.

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Deformation and fragmentation behaviour of exploded metal cylinders and the effects of wall materials, configuration, explosive energy and initiated locations

Cited by 71 publications

References 11 publications

On the complete extinction of selected imperfection wavelengths in dynamically expanded ductile rings

On the complete extinction of selected imperfection wavelengths in dynamically expanded ductile rings

A gas gun based technique for studying the role of temperature in dynamic fracture and fragmentation

Influence of Localized Melting on Dynamic Fracture Behaviours of Metallic Shell

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