Estimate of PBX (Plastic-Bonded Explosive) Shelf Life With Accelerated Aging

Kirchhof, Edemar; Rocha, Roberta Jachura; Nakamura, Nanci Miyeko; Lapa, Camila M.; Pinheiro, Glaci Ferreira Martins; Gonçalves, Rene Francisco Boschi; Rocco, José Atílio Fritz Fidel; Iha, Koshun

doi:10.5935/0100-4042.20160072

Cited by 2 publications

(1 citation statement)

References 13 publications

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“…The useful life prediction of a composite material, such as propellants, can be estimated through analytical chemistry analyses, such as thermal analysis, kinetic decomposition calculations and chemical stability analysis [2].…”

Section: Introductionmentioning

confidence: 99%

Shelf-life analysis of solid rocket engine using HTPB/AP based on kinetic-chemical parameters of DSC analysis and burn on a test bench

Gonçalves

Iwama

Domingues

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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Propellants based on HTPB/AP (hydroxyl-terminated polybutadiene/ammonium perchlorate) are the most commonly used in most of the rocket engines used by the Brazilian Armed Forces. This work aimed at the possibility of extending its useful life (currently in 10 years) by performing chemical kinetic analysis of the energetic material via differential scanning calorimetry (DSC) and also performing computer simulation of aging process using the software Large-scale Atomic/Molecular Massively Parallel Simulator. The simulations presented the experimental behavior of the aging process, showing the bending and cross-link of the binder with the volume contraction and the energetic stabilization. Thermal analysis via DSC was performed in triplicate and in 3 heating ratios (5 °C, 10 °C and 15 °C) of rocket motor with 11-year shelf-life, using the Arrhenius equation to obtain its activation energy, using Ozawa and Kissinger kinetic methods, allowing comparison with manufacturing period data (standard motor). The obtained activation energies were 126.67 kJ/mol (Ozawa) and 122.85 kJ/ mol (Kissinger), much higher than that of the aged propellants (~ 78 kJ/mol, based on literature data), showing that the propellant has not yet aged significantly. In addition, the kinetic parameters of internal pressure of the combustion chamber in 8 rocket engines with 11 years of shelf-life were also acquired, for comparison purposes with the engine start-up data.

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Section: Introductionmentioning

confidence: 99%

Shelf-life analysis of solid rocket engine using HTPB/AP based on kinetic-chemical parameters of DSC analysis and burn on a test bench

Gonçalves

Iwama

Domingues

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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Experimental investigation of 50 MPa reinforced concrete slabs subjected to blast loading

Mendonça¹,

Urgessa²,

Rocco³

2018

Ing. Inv.

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This paper presents results from blast tests conducted on four 50 MPa concrete slabs with reinforcement ratios of 0,175% and 0,37%. Two of the slabs were retrofitted with 50 mm thick foam in order to investigate the potential of using the foam as a strengthening option. The slabs were simply supported on two sides. Non-confined PBX (Plastic bonded explosive) was molded with the form of a cylinder measuring 20 cm in height and 10,5 cm in diameter. The explosive was detonated at 2 m stand-off distance. The equivalent TNT mass of the explosive ranges from 2,58 to 2,72 kg for the four tests. Accelerometers, displacement and pressure gages were used to measure blast wave parameters and global response of the slabs. A high-speed digital camera in conjunction with a rugged notebook recorded images. Qualitative and quantitative results are included. Slabs retrofitted with foam showed a different pressure pattern as recorded by the sensors and resulted in higher displacement, acceleration and linear momentum.

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Estimate of PBX (Plastic-Bonded Explosive) Shelf Life With Accelerated Aging

Cited by 2 publications

References 13 publications

Shelf-life analysis of solid rocket engine using HTPB/AP based on kinetic-chemical parameters of DSC analysis and burn on a test bench

Shelf-life analysis of solid rocket engine using HTPB/AP based on kinetic-chemical parameters of DSC analysis and burn on a test bench

Experimental investigation of 50 MPa reinforced concrete slabs subjected to blast loading

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