Effect of the fractal characteristics of the RDX particles on the rheology of the RDX-based casting aluminized explosives

Cheng, Wangjian; Li, Kun; Gao, Lilong; Feng, Chenhe; An, Chongwei; Ye, Bao-yun; Wang, Jingyu

doi:10.1080/07370652.2021.2013993

Cited by 4 publications

(6 citation statements)

References 32 publications

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“…Considering the symmetry of the model, a two-dimensional axisymmetric model was established, as shown in figure 2. In the model, the MAT_JOHNSON_COOK material model [7,8] In the parameters of JWL equation of state, E0 is the initial specific internal energy of unit volume, which can be calculated by the detonation heat and density of the explosive. The R1, R2 and ω can be acquired according to the explosives with similar components firstly, then the value of A and B can be calculated according to R1, R2 and ω [9], after that, these parameters were substituted into the simulation model of cylinder test for calculation, from which the curve of cylinder expansion distance versus time was obtained.…”

Section: Cylinder Test and Resultsmentioning

confidence: 99%

Numerical simulation research on fragments formation of cylindrical cased charge based on SPH method

Chen

Kou

et al. 2023

J. Phys.: Conf. Ser.

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In order to obtain the fracture and fragmentation of a cased charge under blast loading, the JWL equation of state of HMX-based PBX was fitted based on a cylinder test firstly, then the smooth particle hydrodynamics (SPH) method was used to perform a simulation of cased charge under interior blast loading, in the meantime, an blast test of cased charge was conducted. The results show that the parameters of JWL equation of state and the simulation method were reasonably. The simulated fragments velocities and calculated results from empirical formula agreed well with each other, the maximum error did not exceed 9.5%. Under the direct loading of the detonation wave, the fragments velocities increased to more than 1000m/s immediately within 5us, and then the fragments were continuously accelerated by detonation products and shock wave until the fragments reached the maximum velocities in the later 250us. Eventually, the shape of expansion contour of the casing tended to be ellipsoid. The method and results can provide references for the power design of the fragment warhead, as well as the protection design against the fragments.

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Section: Cylinder Test and Resultsmentioning

confidence: 99%

Numerical simulation research on fragments formation of cylindrical cased charge based on SPH method

Chen

Kou

et al. 2023

J. Phys.: Conf. Ser.

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“…First, the measurement temperature was increased to 50 °C, and the sample was not transferred to the Peltier plate until the temperature deviation was less than 0.02 °C. This procedure was adopted when obtaining fresh slurry, as mentioned in the section “Fabrication of the GAP Propellant Slurries.” Then, the sample was allowed to stand for 15 min to ensure the same thermal history and the available residual force inside the sample . The Peltier plate was subsequently dropped to a gap of 1mm, which denotes that the upper plate was 1mm away from the lower plate.…”

Section: Experimental Sectionmentioning

confidence: 99%

“…This procedure was adopted when obtaining fresh slurry, as mentioned in the section “Fabrication of the GAP Propellant Slurries.” Then, the sample was allowed to stand for 15 min to ensure the same thermal history and the available residual force inside the sample. 12 The Peltier plate was subsequently dropped to a gap of 1mm, which denotes that the upper plate was 1mm away from the lower plate. Finally, strain sweep measurements and frequency sweep measurements were conducted to determine the rheological properties of the samples.…”

Section: Experimental Sectionmentioning

confidence: 99%

“…Steady rheological tests and dynamic rheological tests are two of the prevalent rheological measurement methods. In terms of the regulation of the rheological properties of propellant slurries, particle gradation, the technology of mixing the particles with different sizes in different percentages, has gained momentum. , In other words, the size distribution of particles in propellant slurries is altered by particle gradation technology.…”

Section: Introductionmentioning

confidence: 99%

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Rheological Impact of Particle Size Gradation on GAP Propellant Slurries

Wang

Song

et al. 2022

ACS Omega

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Over the years, widespread interest has been placed on rheological properties to reflect the processability of propellant slurries. Particle gradation technology plays an essential role in the improvement of the processability of propellant slurries. In this article, rheological properties of glycidyl azide polymer (GAP) propellant slurries were measured by dynamic rheological measurements with a rheometer. Submicron-sized (d 50 = 0.221 μm) and micron-sized (d 50 = 33.02 μm) CL-20 particles and ultrafine (d 50 = 2.40 μm) and micron-sized (d 50 = 341.69 μm) AP particles were utilized to investigate the influence of the addition of CL-20 and particle size gradation on rheological properties. The test results demonstrate that the LVE region remains almost invariable while the yield transition process is delayed when the relative content of submicron-sized CL-20 increases from 10 to 20%. The values of G′, G″, and |η*| increase with increasing submicron-sized CL-20. Despite this, the value of |η*| can be effectively reduced to about the same value as the slurries with bimodal AP by the size gradation of CL-20. In addition, particle porosity appears to be a suitable parameter to predict trends concerning the rheological properties of the GAP propellant slurries.

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“…The apparent viscosity of concentrated GAP/AP suspensions is considerably reduced when AP-fine is partially replaced with AP-coarse and the lowest apparent viscosity is attained at a 1 : 1 ratio of AP-coarse to AP-fine by weight. The larger values of D reveal that a small amount of replacement using AP-coarse leads to wider particle size distribution of AP as reflected in Table 1, which contributes to increasing packing fraction of AP [27,28]. AP-fine particles filling into the interstices between AP-coarse particles, the voids are diminished and the GAP/DGTN mixture between AP-coarse is extruded and could flow again during the shear, thus the friction between particles is reduced and the apparent viscosity of suspensions decreases.…”

Section: Influence Of Particle Gradation On Rheological Behavior Of C...mentioning

confidence: 99%

Rheological Behavior of Concentrated GAP/ AP Propellant Suspensions Plasticized by Diglycerol Tetranitrate

Wang

Song

et al. 2022

Propellants Explo Pyrotec

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Concentrated GAP/AP propellant suspensions with different solid contents and molecular masses of GAP were prepared, in which diglycerol tetranitrate (DGTN) was the energetic plasticizer. The steady shear measurements were conducted using a rheometer to examine the influences of component characteristics, particle gradation and temperature on rheological behavior. Results indicate that the GAP/DGTN mixture is Newtonian viscous and concentrated GAP/AP suspensions are pseudoplastic fluids. The Ostwald -De Waele model and the Arrhenius -de Guzman equation are utilized to compare the pseudoplastic behavior and the viscosity-temperature dependence of concentrated suspensions, respectively. The apparent viscosity is exponentially related to solid content and the pseudoplastic behavior gradually increases with solid content revealed by the decreasing power law index (n). Additionally, larger particle size of AP, smaller molecular mass of GAP, or lower temperature make possible the reduced apparent viscosity. Suitable particle gradation reduces the apparent viscosity to the desired value.

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Effect of the fractal characteristics of the RDX particles on the rheology of the RDX-based casting aluminized explosives

Cited by 4 publications

References 32 publications

Numerical simulation research on fragments formation of cylindrical cased charge based on SPH method

Numerical simulation research on fragments formation of cylindrical cased charge based on SPH method

Rheological Impact of Particle Size Gradation on GAP Propellant Slurries

Rheological Behavior of Concentrated GAP/ AP Propellant Suspensions Plasticized by Diglycerol Tetranitrate

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