Dynamic Compressive Properties of Polymer Bonded Explosives under Confining Pressure

Xiao, Youcai; Sun, Yi; Xiao, Li; Zhang, Qiuhua

doi:10.1002/prep.201700016

Cited by 11 publications

(2 citation statements)

References 34 publications

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“…In the present work, the feature size of the PBX1314 structures, L s , is in order of magnitude 1 to 10 cm [ 20 , 24 ], while the feature size of the microcracks, L c , is in the order of magnitude 1 to 10 μm. A representative element volume (RVE) is extracted from the PBX1314 structures.…”

Section: Dynamic Damage Model Of Pbx1314mentioning

confidence: 99%

“…PBX1314 is a cast energetic material with 60 wt % hexahydro-1,3,5-trinitro-1,3,5-s-triazine (RDX), 16 wt % aluminum powder and 24 wt % hydroxy-terminated polybutadiene (HTPB). The binder makes PBX1314 soft under uniaxial compression [ 22 ], uniaxial tension [ 23 ], multi-axial compression [ 24 ] and gives it low sensitivity under shock [ 25 ]. In impact damage experiments [ 26 ], microcracks nucleation and growth are observed.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Mechanical Damage and Non-Shock initiation of a New Polymer Bonded Explosive during Penetration

2020

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Complexities of heating mechanisms make it difficult to investigate the safety of a polymer bonded explosive (PBX) charge of earth-penetrating-weapons (EPWs) during penetration. In this paper, the dynamic damage and non-shock initiation of PBX1314 (60 wt % hexahydro-1, 3, 5-trinitro-1, 3, 5-s-triazine (RDX), 16 wt % aluminum, 24 wt % hydroxy-terminated polybutadiene (HTPB)) during penetration is investigated through experiments and simulations. In the experiments, steel projectiles filled with PBX1314 are launched to penetrate concrete targets. In the results, non-shock initiations occur on the tail surface of PBX1314 along with mechanical damage of the tail and middle part of PBX1314. A dynamic damage and initiation model is proposed to characterize the effects of microcracks on the mechanical and thermal responses of PBX1314. Investigation based on the model suggests that microcrack interfacial friction plays significant roles in damage, heat generation and localization in PBX1314. A non-shock initiation criterion is developed based on macroscale variables in PBX1314. Numerical simulations of the penetration experiments are performed by using the proposed model and criterion. The mechanical damage and non-shock initiation of PBX1314 in the experiments are successfully predicted. The simulation results indicate that the tail of PBX1314 impacts the projectile repeatedly during penetration. Finally, the initiation criterion is satisfied because of frictional heat localization near microcrack surfaces and initiation is activated in the tail of PBX1314.

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Section: Dynamic Damage Model Of Pbx1314mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic Mechanical Damage and Non-Shock initiation of a New Polymer Bonded Explosive during Penetration

2020

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Effect of Confining Pressure on Impact Reaction Threshold of Aluminum/Polytetrafluoroethylene Reactive Material

2023

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An impact reaction experiment is conducted with a modified split Hopkinson pressure bar (SHPB) apparatus to study the reaction threshold of aluminum/polytetrafluoroethylene (Al/PTFE) reactive materials under confining pressure. The dynamic compression behavior, impact damage characteristics, and impact reaction threshold of the Al/PTFE reactive material under the confining pressure are investigated. The results have presented that confining pressure makes the specimens suffer triaxial loading and improves the dynamic compressive strength of Al/PTFE reactive materials from 36.8 MPa (impact velocity is 14.64 m s−1) to 62.7 MPa (14.80 m s−1). Besides, the fractal dimension of the posttest specimen is decreased by confining pressure, which has proved that the confining pressure hinders damage under impact loading. Moreover, the impact reaction experiment demonstrates that the confining pressure increases the threshold of Al/PTFE, and the minimum specific incident energy for the reaction of the T10 (molding pressure is 10 MPa) specimen increases from 48.92 to 59.72 J cm − 2 . This research not only reveals that Al/PTFE can be reacted by impact loading at confining pressure but also clarifies that confining pressure limits the impact damage of the Al/PTFE reactive material and increases the reaction threshold.

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Mechanical Behaviour of a NTO and RDX‐Based Melt Cast Explosive

Drouet

Hanus

Pavier³

et al. 2020

Propellants Explo Pyrotec

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Constitutive equationsThe XF explosive family from NEXTER Munitions relies on a melt cast formulation with a TNT matrix. Melt cast formulations provide a high‐volume ratio of energetic filler material to matrix. This might affect the mechanical response of the material and its damage process. Therefore, a laboratory study has been launched to improve the knowledge of the mechanical behavior of this family of energetic materials. To mimic the conditions observed by the material inside ammunition, we chose to adapt a passive confinement method to the pyrotechnic conditions of the XF‐11585. This relies on an elastic‐perfectly plastic ring that gives us access to the shear behavior for different loadings in quasi‐static regime. This setup allowed us to investigate the physical phenomena involved under both pressure and shear. Then, based on the results obtained, we built an isotropic elastic damage model. This macroscopic modeling of damage is meant to be simple but complex enough to provide an assessment of the material degradation.

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Dynamic Compressive Properties of Polymer Bonded Explosives under Confining Pressure

Cited by 11 publications

References 34 publications

Dynamic Mechanical Damage and Non-Shock initiation of a New Polymer Bonded Explosive during Penetration

Dynamic Mechanical Damage and Non-Shock initiation of a New Polymer Bonded Explosive during Penetration

Effect of Confining Pressure on Impact Reaction Threshold of Aluminum/Polytetrafluoroethylene Reactive Material

Mechanical Behaviour of a NTO and RDX‐Based Melt Cast Explosive

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