Research on the Specific Heat Capacity of PBX Formulations Based on RDX

Chaves, Flávio Rodrigues; Góis, José C.

doi:10.5028/jatm.v8i3.655

Cited by 5 publications

(2 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Simulations were conducted with the properties of propellant ingredients shown in Table 2. Thermodynamic and dielectric properties required for direct simulation of microwave heating were taken from literature [13,[35][36][37][38]. For the binder and EG phase, a volumetric mixing model was used to calculate the dielectric properties, while all other properties of the binder and EG phase were assumed to be similar to that of HTPB.…”

Section: Microwave Heating Simulationmentioning

confidence: 99%

On‐demand microwave growth of porosity within a granular composite energetic material: Void formation via a dielectric loss phase change binder additive for propellant burning rate control

Lajoie,

Jones,

Lawrence

et al. 2024

Propellants Explo Pyrotec

View full text Add to dashboard Cite

This study demonstrates, for the first time ever, the ability to grow, in an on‐command fashion, porosity within a granular composite energetic material to effect a change in energy output rate. Specifically, the study investigates the change in burning rates of ammonium perchlorate composite propellants as a result of porosity created in situ via microwave field‐driven volatilization of the low boiling point binder additive, ethylene glycol. Theoretical mass densities were measured before and after microwave irradiation finding that the maximum observed %TMD change for tested propellants is 6 %. Propellants were burned at 1.72 MPa to 6.89 MPa pressures, finding that for all propellants, microwave irradiation produced a change in ballistic characteristics. Most propellant formulations demonstrate acceptable burning rate parameters for use within rocket motors; some exhibited a large change in their pressure exponent as well as slope breaks attributed to the onset of convective burning, while microwave irradiation produced no change in burning rate or density in reference propellants without the additive. Microwave heating simulation results are presented to gain insight into the thermal environment of the propellant during microwave irradiation. These results provide valuable insight into propellant formulations that can have their burning rates (and thus the thrust profile for motor grains) altered after casting via microwave irradiation.

show abstract

Section: Microwave Heating Simulationmentioning

confidence: 99%

On‐demand microwave growth of porosity within a granular composite energetic material: Void formation via a dielectric loss phase change binder additive for propellant burning rate control

Lajoie,

Jones,

Lawrence

et al. 2024

Propellants Explo Pyrotec

View full text Add to dashboard Cite

show abstract

“…In order to model the thermal behavior of the HTPB-AP energetic material, thermal conductivity values of the individual constituents are needed. For the HTPB and AP phases, thermal conductivity values are readily available in literature [51,52]. However, there are no available thermal conductivity values for the HTPB-AP interface.…”

Section: Shock Viscosity For Htpb-ap Interfacementioning

confidence: 99%

The effect of interface shock viscosity on the strain rate induced temperature rise in an energetic material analyzed using the cohesive finite element method

Prakash

Gunduz

Tomar

2019

Modelling Simul. Mater. Sci. Eng.

View full text Add to dashboard Cite

In this work, shock induced failure and local temperature rise behavior of a hydroxyl-terminated polybutadiene (HTPB)—ammonium perchlorate (AP) energetic material is modeled using the cohesive finite element method (CFEM). Thermomechanical properties used in the model were obtained from four different experiments: (1) dynamic impact experimental measurements for fitting a viscoplastic constitutive model, (2) in situ mechanical Raman spectroscopy (MRS) measurements of the separation properties for fitting a cohesive zone model, (3) a pulse laser induced particle impact experiment combined with the MRS for measurement of the interface shock viscosity, and (4) Raman thermometry experiments for measurement of HTPB, AP, and HTPB-AP interface thermal conductivity. HTPB-AP interface regions with high density of particles were found to be more susceptible to local temperature rise due to the presence of viscoplastic dissipation as well as frictional heating. The increase in the interface shock viscosity lead to a decrease in both the viscoplastic and frictional dissipation. This resulted in a decrease in the maximum temperature and the density of local regions with a maximum temperature rise within the HTPB-AP microstructure. A power law relation for the decrease in viscoplastic energy dissipation, temperature rise and the density of the local temperature rise with the interface shock viscosity was obtained.

show abstract

The effect of the particle surface and binder properties on the response of polymer bonded explosives at low impact velocities

Dandekar

Roberts

Paulson

et al. 2019

Computational Materials Science

View full text Add to dashboard Cite

Research on the Specific Heat Capacity of PBX Formulations Based on RDX

Cited by 5 publications

References 13 publications

On‐demand microwave growth of porosity within a granular composite energetic material: Void formation via a dielectric loss phase change binder additive for propellant burning rate control

On‐demand microwave growth of porosity within a granular composite energetic material: Void formation via a dielectric loss phase change binder additive for propellant burning rate control

The effect of interface shock viscosity on the strain rate induced temperature rise in an energetic material analyzed using the cohesive finite element method

The effect of the particle surface and binder properties on the response of polymer bonded explosives at low impact velocities

Contact Info

Product

Resources

About