Influence of storage time before casting on viscosities and mechanical properties of AP/HTPB/Al solid composite propellants

Cunha, Bruno Cesar Christo da; Mattos, Elizabeth da Costa; Rocco, José Atílio Fritz Fidel

doi:10.1016/j.fpc.2022.03.008

Cited by 7 publications

(1 citation statement)

References 18 publications

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“…For this series, both curing time (40 s) and aging time (24 h) are the lowest in the dataset. Thus, curing time and the effect of aging appear to be important, as also indicated in other work on photo-polymerized solid propellants [8] and classically manufactured composite ones [37,38]. The TA2 set, characterized by a higher curing time and a doubling of aging, shows significantly better results, which are in line with the expected ones.…”

Section: Viscosity Testssupporting

confidence: 82%

Rheological and Mechanical Characterization of 3D-Printable Solid Propellant Slurry

Zumbo,

Stumpo,

Antonaci

et al. 2024

Polymers

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This study delves into the rheological and mechanical properties of a 3D-printable composite solid propellant with 80% wt solids loading. Polybutadiene is used as a binder with ammonium sulfate, which is added as an inert replacement for the ammonium perchlorate oxidizer. Further additives are introduced to allow for UV curing. An in-house illumination system made of four UV-A LEDs (385 nm) is employed to cure the resulting slurry. Rheological and mechanical tests are conducted to evaluate the viscosity, ultimate tensile strength and strain, and compression behavior. Viscosity tests are performed for both pure resin and complete propellant composition. A viscosity reduction factor is obtained for the tested formulations when pre-heating slurry. Uniaxial tensile and compression tests reveal that the mechanical properties are consistent with previous research. Results emphasize the critical role of temperature and solid loading percentage. Pre-heating resin composites may grant a proper viscosity reduction while keeping mechanical properties in the applicability range. Overall, these findings pave the way for the development of a 3D printer prototype for composite solid propellants.

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Section: Viscosity Testssupporting

confidence: 82%