Understanding damage in polymer-bonded explosive composites

Drodge, Daniel; Williamson, David M.

doi:10.1007/s10853-013-7378-6

Cited by 36 publications

(17 citation statements)

References 32 publications

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“…It was also recognized that filling the propellant with small particles is beneficial to the mechanical properties [14,31,28]. This feature is consistent with the size effect observed on explosive materials [24,6] loaded in compression and on a broader range of particulate polymer composites [2,8] loaded in tension. For the latter composites, adding small particles has no impact on the initial Young modulus but increases the material strength [2].…”

Section: Introductionsupporting

confidence: 72%

“…However, to this day, very few data are available on the effect of mixing large and small particles on the mechanical behavior of highly filled elastomers. Studies have been recently conducted on explosive materials loaded in compression at low and high strain rates [6]. In that contribution, the authors have emphasized that the mechanical behavior of explosives with bimodal size distributions is distinct from the mechanical behavior of both large particles and small particles only composites.…”

Section: Introductionmentioning

confidence: 99%

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Effects of small particles on the mechanical behavior and on the local damage of highly filled elastomers

et al. 2016

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The mechanical behavior and damage of highly filled elastomers such as propellants is studied experimentally. A model material made of a polyacrylate matrix filled with glass beads and energetic binders filled with ammonium perchlorate and HMX have been formulated. The focus is on materials containing micrometric size particles. The size of fillers was varied from a few microns to hundreds of microns in order to study the impact of the size of particles. The materials stress-strain responses and the volume changes during uniaxial tensile tests have been recorded. Microtomographic slices of strained samples have been obtained in order to look at the type of damage sustained by the acrylate/glass bead materials. It appears that in the presence of large particles, composites showing early prominent crack benefits from the addition of small particles, whereas composites showing well dispersed matrix/particle decohesion without large cracks show no change of behavior when small particles are added.

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Section: Introductionsupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Effects of small particles on the mechanical behavior and on the local damage of highly filled elastomers

et al. 2016

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“…In the past decades, much progress on reactive materials has been achieved, especially in their formulation, fabrication, energy release characteristics, and demonstration experiments of their enhanced damage effect . However, due to the low material strength and density, their engineering applications were restricted.…”

Section: Introductionmentioning

confidence: 99%

Quasi‐Static Compression Properties and Failure of PTFE/Al/W Reactive Materials

Liu

Zheng

et al. 2016

Adv Eng Mater

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Quasi-static compression experiments are performed on two kinds of the PTFE/Al/W reactive material specimens, fabricated by means of the cold isostatic pressing but not sintering or the pressing followed by sintering, respectively. The results show that, compared with the pressed specimens, the sintered specimens show higher failure stress and greater fracture toughness. Moreover, the mesoscale failure behaviors are significantly influenced by the sintering technique and the component ratios. There are significantly different bonding and dispersion type of the PTFE matrix between the pressed specimen and the sintered specimen, resulting in the differences of mechanical properties and failure behavior between the two kinds of specimens.

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“…Optical methods, such as photoelasticity, digital speckle radiography, laser induced fluorescent speckle photography, and digital image correlation have been used in the past to understand the failure and fracture mechanics of PBXs subjected to dynamic loading [1][2][3][4][5][6][7]. Most of these studies are at macroscale and have provided much insight into the continuum scale high strain rate behavior of PBXs [2][3][4][5][6][7][8][9][10]. However, these experiments are inadequate to understand the local deformation mechanisms in highly heterogeneous PBX materials.…”

Section: Introductionmentioning

confidence: 99%

Local Deformation and Failure Mechanisms of Polymer Bonded Energetic Materials Subjected to High Strain Rate Loading

Ravindran

Tessema

Kidane

2016

J. dynamic behavior mater.

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The dynamic multi-scale deformation mechanism of polymer bonded energetic material is investigated. Samples made of polymer bonded sugar (a known simulate for polymer bonded explosives) with 85 % sugar crystals and 15 % polymer binder are used. The samples are dynamically compressed using a split Hopkinson pressure bar. Using a high magnification, meso-scale 2D digital image correlation experimental setup, the local deformation is measured in situ at sub-grain scale. The macroscale deformation mechanism is also investigated with the help of 3D digital image correlation. From the mesoscale experiment, it is observed that the local strain distribution in the specimen is highly heterogeneous with large strain localization occurring at the polymer rich areas between the crystal boundaries. Deformations of the majority of the crystals are minimal, and usually realign themselves to accommodate large deformation of the binder by rigid rotation and sliding. Due to this, delamination of the polymer binder from crystals and binder cracking are the main local failure modes. It is also observed that the presence of small crushed crystals from material processing are the favorable sites for this opening mode failure.

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Understanding damage in polymer-bonded explosive composites

Cited by 36 publications

References 32 publications

Effects of small particles on the mechanical behavior and on the local damage of highly filled elastomers

Effects of small particles on the mechanical behavior and on the local damage of highly filled elastomers

Quasi‐Static Compression Properties and Failure of PTFE/Al/W Reactive Materials

Local Deformation and Failure Mechanisms of Polymer Bonded Energetic Materials Subjected to High Strain Rate Loading

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