Behaviour of composite solid propellant under biaxial tensile loading

Ranjan, Rajeev; Murthy, H.; Bhowmik, Debdas; Sadavarte, V. S.

doi:10.1016/j.polymertesting.2023.108054

Cited by 9 publications

(2 citation statements)

References 74 publications

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“…Damage, destruction, and fracture behaviors are predominantly governed by the debonding between the polymer binder chains and the matrix/fillers. Especially at low temperatures (environmental temperature of −40°C), the mechanical performance significantly deteriorates compared to room temperature (20°C) 21–23 . This can cause the propellant grain to become brittle and fracture under high pressure, resulting in an increased burning surface and even chamber detonation 24 .…”

Section: Introductionmentioning

confidence: 99%

Effect of particle size distribution on the cryogenic mechanical properties of triple‐base propellants

Li,

Huang,

Wang

et al. 2024

Polymer Composites

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Fillers play a decisive role in the mechanical properties of polymer composites. In this paper, different particle sizes of nitroguanidine were obtained to regulate the internal filler structure of triple‐base propellants (TBP) to improve their mechanical response in different environments. A series of morphological and structural characterizations on nitroguanidine (NQ) particles were conducted using techniques. The results indicated that the obtained NQ particles maintained a high level of crystalline quality while preserving their molecular integrity. The mechanical properties of TBP were systematically evaluated under various loading conditions, including cryogenic tensile, compressive, and impact loads, as well as dynamic thermomechanical effects. Additionally, three‐point bending simulations were employed to elucidate the mechanical responses and damage mechanisms. Under axial tensile and compressive loads, reducing the particle size of NQ significantly enhanced the tensile and compressive strength. The maximum tensile strength and compressive strength can reach 344.62 MPa and 104.79 MPa. Moreover, the compressive failure mode transitioned from cracking to axial shrinkage. Conversely, when subjected to radial bending loads, TBP exhibited contrasting behavior, including a decrease in the glass transition temperature from 84.73°C to 76.93°C and a non‐monotonic trend in impact strength (initially increasing from 4.96 to 8.85 kJ/m2 and then decreasing to 2.27 kJ/m2). This study provides valuable insights into the mechanical performance of TBP, supporting the development of high‐energy, high‐strength TBP formulations.Highlights SEM analysis confirms the pronounced orientation effect of rod‐like NQ. The orientation and particle size of NQ decide TBP's radial impact resistance. Submicron NQ enhances the compression resistance property of TBP. Submicron NQ brings about a shift in the microscopic damage morphology of TBP.

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Section: Introductionmentioning

confidence: 99%

Effect of particle size distribution on the cryogenic mechanical properties of triple‐base propellants

Li,

Huang,

Wang

et al. 2024

Polymer Composites

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“…The resilience of these propellants in harsh environments is crucial, as it ensures the reliable performance of solid rocket engines in powering spacecraft [4,5]. Nevertheless, throughout their lifecycle, these engines are subject to various external environmental factors, including temperature fluctuations, wave motion, airflow-induced vibrations, and mechanical vibrations during land transport [6][7][8]. These factors can induce internal structural damage to the propellant, manifesting as microcrack expansion, micropore proliferation, and weakened bonding strength between particles and the matrix, or at the matrix interface [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Analysis of thermomechanical coupled accelerated aging of HTPB propellants

Zeng,

Huang,

Chen

et al. 2024

Propellants Explo Pyrotec

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This study employed macroscopic uniaxial compression tests at low and medium strain rates, coupled with microscopic electron microscopy, to extensively analyse the impact of thermomechanical coupled aging on the accelerated aging of Hydroxyl‐terminated Polybutadiene (HTPB) propellants, contrasting it with the effects of isolated factors such as heat and dynamic reciprocating force. Results indicate that at various environmental temperatures (323 K, 343 K, and 363 K), thermomechanical coupled aging more significantly affects HTPB propellants than isolated factors. This effect is macroscopically evident in increased ease of deformation, permanent deformation during aging, continual increase in dissipated energy, and a decrease in average stress and ultimate strain post‐aging. Microscopically, the effect predominantly arises from the interplay between matrix thermal degradation and particle fragmentation, which rapidly accumulate and substantially impact the material's macroscopic mechanical properties. Furthermore, as the aging temperature rises, the alterations in both macroscopic mechanical properties and microscopic morphology of HTPB propellants become more pronounced. However, overly high temperatures may swiftly result in substantial material performance deterioration. Consequently, while elevating temperature effectively accelerates thermomechanical aging, the potential adverse effects on material performance must be judiciously considered. This underscores the necessity of balancing temperature regulation with aging efficiency enhancement in HTPB propellants to ensure effective control and quantitative assessment of the aging process, while minimizing material degradation.

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3D‐DIC for mechanical characterization of composite solid propellant under uniaxial compression

Ranjan,

Murthy

2024

Propellants Explo Pyrotec

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A novel experimental setup, utilizing 3D Digital Image Correlation (3D‐DIC), is employed to characterize the mechanical behaviour of composite solid propellant (CSP) under uniaxial compression at three displacement rates (1, 7, and 50 mm/min). At larger deformation, 3D‐DIC consistently shows smaller strains than nominal strain values, and this difference increases with deformation across all the displacement rates. Displacement rates significantly affect the non‐linear stress‐strain response of the CSPs. After the completion of the compression test, the specimen is unloaded, and the lengths of the unloaded specimens measured after 24 hour indicate a recovery of 90–94 % of the original length of the specimens. The recovered length increases with an increase in the displacement rate. Initially, Poisson's ratio is close to 0.5, and dilatation is zero, indicating an incompressible behaviour. However, both Poisson's ratio and dilatation increase with an increase in longitudinal strain, indicating a transition to compressible behaviour. Comparing the scanning electron microscope (SEM) micrographs of the virgin and compressive‐loaded samples, noticeable debonding is observed at the matrix‐particle interfaces.

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Behaviour of composite solid propellant under biaxial tensile loading

Cited by 9 publications

References 74 publications

Effect of particle size distribution on the cryogenic mechanical properties of triple‐base propellants

Effect of particle size distribution on the cryogenic mechanical properties of triple‐base propellants

Analysis of thermomechanical coupled accelerated aging of HTPB propellants

3D‐DIC for mechanical characterization of composite solid propellant under uniaxial compression

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