Dynamic mechanical analysis of double base rocket propellants

Cegła, Marcin; Borkowski, J.; Zmywaczyk, Janusz; Koniorczyk, Piotr

doi:10.5604/12345865.1197970

Cited by 4 publications

(2 citation statements)

References 3 publications

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“…And its mechanical properties depend on the properties of the matrix, concentration of the components, particle size, particle distribution, and the quality of the interface between polymeric binder and filler. Over the past few decades, a great amount of work has been done to study mechanical properties of the solid propellant under different loading forms and experimental conditions [5–10], like tension/compression, low/middle/high strain rate, and environment temperature. However, these studies can't truly reflect the mechanical properties of solid propellants at the ignition condition, which work under the confining pressure condition.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on Tensile Mechanical Properties of NEPE Propellant under Confining Pressure

Wang

Meng³

et al. 2020

Propellants Explo Pyrotec

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To study the tensile mechanical properties of the Nitrate Ester Plasticized Polyether (NEPE) propellant under varying confining pressure conditions, uniaxial tensile tests were conducted under different strain rates (from 0.0006667 s−1 to 0.06667 s−1) and confining pressure conditions (from relative atmospheric pressure up 5.4±0.03 MPa) using a new‐designed confining pressure testing machine. Scanning electron microscopy (SEM) was employed to observe the tensile fracture surfaces. The mechanical properties and damage processes of the NEPE propellant under varying confining pressure conditions were studied and analysed. The results indicate that the mechanical properties of propellant materials are remarkably influenced by the varying confining pressure conditions. The ultimate strain and maximum tensile stress increase with increasing confining pressure. Moreover, the maximum tensile stress present a linear‐log relationship with the strain rate under various confining pressure conditions. Yet, the confining pressure has no obvious effect on the initial elastic modulus. The reason for the change of the mechanical properties of the NEPE propellant is that confining pressure delays the initiation and development of damage under the tensile loading. Based on the time‐pressure superposition principle (TPSP), the master curve of maximum tensile strength of the NEPE propellant was constructed. Furthermore, the results can provide a theoretical foundation for the analysis of the structural integrity of propellant grains of a SRM under ignition conditions. Finally, a constitutive model considering compressibility of propellant materials can be constructed.

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Section: Introductionmentioning

confidence: 99%

Experimental Research on Tensile Mechanical Properties of NEPE Propellant under Confining Pressure

Wang

Meng³

et al. 2020

Propellants Explo Pyrotec

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“…The new rocket propellant composites, besides their environmentally friendly character, displayed better performances: up to a 30% improvement of the specific volume (in comparison with HTPB-based rocked propellant from consecrated aviation missiles). The heat of combustion (≈1000 cal/g) and T g values (−60 • C to −32 • C) were comparable with nitrocellulose double base propellants (≈1020 cal/g and −35.5 • C) [34,35], which ensure that they maintain their performances even at lower environmental temperatures. The polyols obtained from PET degradation, the polyurethanes, and the composite rocket propellant formulations were investigated through specific analytical tools.…”

Section: Introductionmentioning

confidence: 74%

Novel Polyurethanes Based on Recycled Polyethylene Terephthalate: Synthesis, Characterization, and Formulation of Binders for Environmentally Responsible Rocket Propellants

et al. 2021

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Novel polyurethane-based binders, specifically designed for environmentally responsible rocket propellant composites, were obtained by employing the polyester-polyols that resulted from the degradation of polyethylene terephthalate waste. A new class of “greener” rocket propellants, comprising polyurethanes (based on recycled PET) as the binder, phase stabilized ammonium nitrate (PSAN) as the eco-friendly oxidizer, and triethylene glycol dinitrate (TEGDN) as the energetic plasticizer, together with aluminum as fuel and Fe2O3 as the catalyst, is herein reported. The components of the energetic mixtures were investigated (individually and as composite materials) through specific analytical tools: 1H-NMR, FT-IR, SEM-EDX, DTA and TGA, tensile and compression tests, DMA, and micro-CT. Moreover, the feasibility of this innovative solution is sustained by the ballistic performances exhibited by these composite materials in a subscale rocket motor, proving that these new formulations are suitable for rocket propellant applications.

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Uniaxial tensile mechanical behavior research of HTPB propellant under wide temperature and confining pressure

Li,

et al. 2023

AIP Advances

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To investigate the effects of confining pressure, strain rates, and temperatures on the mechanical properties of the Hydroxyl-terminated Polybutadiene (HTPB) propellant, uniaxial tensile tests were performed utilizing wide-temperature-confining pressure systems. The resulting damage was subsequently analyzed and characterized through scanning electron microscopy and mirco-ct. The results indicate that the stress–strain curves of HTPB at 20 and 70 °C are comparable, and the propellant damage is primarily attributed to de-wetting at 20 and 70 °C with respect to the mechanism. At −50 °C, the maximum tensile strength and ultimate tensile strain at 8 MPa surpass those at 0 and 2 MPa to a significant degree and the damage shifts from de-wetting and ductile fracture of particles to severe particle breakage with the elevated confining pressure. Ultimately, the primary curve of the HTPB propellant's maximum tensile strength was constructed by the curve fitting analysis based on the time–temperature equivalent superposition principle (TTSP) and time–pressure equivalent superposition principle (TPSP). Comparing to the properties of TPSP, TTSP exhibits a wider range of applicability and greater fitting precision in relation to the HTPB propellant. This study mainly serves to establish a fundamental theory and furnish data support for the enhancement of mechanical properties and structural integrity of solid rocket motors.

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Dynamic mechanical analysis of double base rocket propellants

Cited by 4 publications

References 3 publications

Experimental Research on Tensile Mechanical Properties of NEPE Propellant under Confining Pressure

Experimental Research on Tensile Mechanical Properties of NEPE Propellant under Confining Pressure

Novel Polyurethanes Based on Recycled Polyethylene Terephthalate: Synthesis, Characterization, and Formulation of Binders for Environmentally Responsible Rocket Propellants

Uniaxial tensile mechanical behavior research of HTPB propellant under wide temperature and confining pressure

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