Mechanical and thermomechanical properties of NC base propellants

Wiegand, Donald A.; Nicolaides, S.; Pinto, José Carlos

doi:10.1080/07370659008225433

Cited by 13 publications

(5 citation statements)

References 2 publications

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“…Different kinds of energetic crystals, polymer binders, and their distribution cause changes in the mechanical behavior of PBX materials. [5][6][7][8][9] Therefore, determining how these factors affect the macro-mechanical behavior of PBX is important. 10,11 Generally, polymer-based materials have non-linear mechanical properties which are highly temperature dependent.…”

Section: Introductionmentioning

confidence: 99%

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Effects of temperature and strain rate on the dynamic responses of three polymer-bonded explosives

Qin

et al. 2011

The Journal of Strain Analysis for Engineering Design

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Polymer-bonded explosives (PBXs) are typical particulate composites of energetic crystals in a polymer matrix, which have a volume fraction of 60% to 95%. They are engineered to provide reliable performance and maximum safety envelopes through reduction of their sensitivity. There are three kinds of polymer-bonded explosive materials; namely, PBX1, PBX2, and PBX3. The last two polymer-bonded explosives were recently invented, in search of the more insensitive polymer-bonded explosive but with high detonation energy also. To investigate the dynamic response of new materials, the uniaxial compressive stress-strain behavior of the three polymer-bonded explosives was investigated as a function of temperature and strain rate. Constant and non-constant strain rate loading experiments were conducted in the use of pulse shapers. By comparing two different loads, the strain rate effect of these materials was found to depend on the instantaneous strain rate. The variations in failure stress, and failure strain with temperature, strain rate, and material composition were examined. The dependence of compressive strength on temperature and strain rate can be attributed to the Young's modulus and fracture surface energy according to Griffith criteria for fracture. The axial splitting caused by brittle fracture for most conditions was also investigated. Another failure mode of PBX2 agreed with the Mohr's failure mode criterion. All results show that PBX2 has more stable mechanical behavior and higher detonation performance.

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Section: Introductionmentioning

confidence: 99%

“…Different kinds of energetic crystals, polymer binders, and their distribution cause changes in the mechanical behavior of PBX materials. 5–9 Therefore, determining how these factors affect the macro-mechanical behavior of PBX is important. 10,11…”

Section: Introductionmentioning

confidence: 99%

Effects of temperature and strain rate on the dynamic responses of three polymer-bonded explosives

Qin

et al. 2011

The Journal of Strain Analysis for Engineering Design

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“…The reason is attributed to the fact that CNFs restrict the expansion in the transverse and longitudinal direction and provide resistance to stress and impact force under axial or radial loading due to uniform random dispersion within the propellant. In addition, because the NC based propellant become brittle and hard with decrease of temperature [41], the compressive strengths at À40 8C is higher than that at 20 8C. On the contrary, the impact strengths at À40 8C is lower than that at 20 8C.…”

Section: Full Papermentioning

confidence: 96%

“…The propellant grains are subjected to very high pressures and pressure gradients for very short times during ignition and combustion in a gun chamber [11][12][13]. This situation can result in mechanical breakup of the propellant grains which would lead to a large increase of surface area and so to anomalously high pressurization rates and burning or hazardous breech blow [14]. There has been a continuing need to improve the mechanical properties of the gun propellants.…”

Section: Introductionmentioning

confidence: 99%

Influence of Carbon Nanofibers on Thermal and Mechanical Properties of NC‐TEGDN‐RDX Triple‐Base Gun Propellants

Shen

Liu

et al. 2018

Propellants Explo Pyrotec

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Triple‐base gun propellants composed of nitrocellulose (NC), triethylene glycol dinitrate (TEGDN) and cyclotrimethylenetrinitramine (RDX) with carbon nanofibers (CNFs) were studied to explore the effects of CNFs on the thermal and mechanical properties. The results indicated that CNFs with less than 0.50 wt % were evenly and randomly dispersed in the propellant, otherwise there existed obvious aggregation. Temperatures of initial decomposition and exothermic peak reduced with the increase of NCFs from 0.00 to 3.00 wt %. Decomposition enthalpy of the composites with 0.50 wt % NCFs was 1214.6 J g−1, increased by ∼131.4 J g−1 compared to that of NC‐TEGDN‐RDX propellants. Moreover, the mechanical properties were effectively tailored by varying the amount of CNFs added to the composition. Decomposition enthalpy of the propellant with 0.25 wt % CNFs were hardly compromised for achieving enhancement in the compressive and impact properties, while the tensile strengths decreased slightly compared to that of the propellants.

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“…It is essential to understand the mechanical behaviors of solid propellants under different environmental conditions [1][2][3]. However, due to the various composition contents and environmental conditions, solid propellants always show complex and different mechanical behaviors [4][5][6]. During the service period of SRMs, solid propellant grains need to be stored for a long time and then work during ignition pressurization loading.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Influence of Confining Pressure on Thermal Aged CMDB Propellant

Liu

Chen

et al. 2022

Propellants Explo Pyrotec

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With the purpose of investigating the influences of aging time and confining pressure on the mechanical properties of a composite modified double‐based (CMDB) propellant, uniaxial tension tests of the propellant with various accelerated aging times were conducted under various confining pressure conditions (relative atmospheric pressure 0, 0.5±0.05, 2±0.05 and 6±0.05 MPa). The stress‐strain behaviors at various experimental conditions were analyzed. The results show that stress‐strain curves can be divided into three stages, the initial tensile stage, the elastic stage, and the damage growth stage. Additionally, the key mechanical parameters (e. g., the maximum tensile strength) show a strong dependence on aging time and confining pressure. The ultimate strain decreases with increasing aging time, while the tensile strength first decreases and later increases with aging time. It was observed that the maximum tensile strength and elastic modulus of the CMDB propellant decrease with confining pressure. Furthermore, the damage evolution curves can be divided into two stages. The later nonlinearity of the stress‐strain curves is mainly induced by the initiation and propagation of macro‐cracks. It is believed that these findings will help to accurately analyze the structural integrity of CMDB propellant grains during ignition pressurization loading after a long storage time.

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Mechanical and thermomechanical properties of NC base propellants

Cited by 13 publications

References 2 publications

Effects of temperature and strain rate on the dynamic responses of three polymer-bonded explosives

Effects of temperature and strain rate on the dynamic responses of three polymer-bonded explosives

Influence of Carbon Nanofibers on Thermal and Mechanical Properties of NC‐TEGDN‐RDX Triple‐Base Gun Propellants

Experimental Investigation on the Influence of Confining Pressure on Thermal Aged CMDB Propellant

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