Use of a micromechanical approach to understand the mechanical behavior of solid propellants

Francqueville, Foucault de; Diani, Julie; Pierre, Guillaume; Vandenbroucke, Aude

doi:10.1016/j.mechmat.2020.103656

Cited by 37 publications

(18 citation statements)

References 34 publications

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“…As the key point in studying the mechanical properties of viscoelastic materials, the relaxation modulus and dynamic modulus have a wide range of applications in the overall design, safety inspection, structural integrity assessment, and simulation calculation of the solid engine [ 13 , 14 ]. They are not actually independent and unrelated, rather they have a clear integral conversion relationship in theory, but the limitation of the extremely accurate theoretical relationship means that their application in the engineering field will be limited [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Numerical Conversion Method for the Dynamic Storage Modulus and Relaxation Modulus of Hydroxy-Terminated Polybutadiene (HTPB) Propellants

Cao

et al. 2022

Polymers

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As a typical viscoelastic material, solid propellants have a large difference in mechanical properties under static and dynamic loading. This variability is manifested in the difference in values of the relaxation modulus and dynamic modulus, which serve as the entry point for studying the dynamic and static mechanical properties of propellants. The relaxation modulus and dynamic modulus have a clear integral relationship in theory, but their consistency in engineering practice has never been verified. In this paper, by introducing the “catch-up factor λ” and “waiting factor γ”, a method for the inter-conversion of the dynamic storage modulus and relaxation modulus of HTPB propellant is established, and the consistency between them is verified. The results show that the time region of the calculated conversion values of the relaxation modulus obtained by this method covers 10−8–104 s, spanning twelve orders of magnitude. Compared to that of the relaxation modulus (10−4–104 s, spanning eight orders of magnitude), an expansion of four orders of magnitude is achieved. This enhances the expression ability of the relaxation modulus on the mechanical properties of the propellant. Furthermore, when the conversion method is applied to the dynamic–static modulus conversion of the other two HTPB propellants, the results show that the correlation coefficient between the calculated and measured conversion values is R2 > 0.933. This proves the applicability of this method to the dynamic–static modulus conversion of other types of HTPB propellants. It was also found that λ and γ have the same universal optimal value for different HTPB propellants. As a bridge for static and dynamic modulus conversion, this method greatly expands the expression ability of the relaxation modulus and dynamic storage modulus on the mechanical properties of the HTPB propellant, which is of great significance in the research into the mechanical properties of the propellant.

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Section: Introductionmentioning

confidence: 99%

Numerical Conversion Method for the Dynamic Storage Modulus and Relaxation Modulus of Hydroxy-Terminated Polybutadiene (HTPB) Propellants

Cao

et al. 2022

Polymers

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“…In contrast, microCT can not only obtain the internal mesostructure of the material, but also clearly distinguish the interface phase, matrix and different solid fillers, and realize the quantitative characterization of the internal mesostructure of the material. Francqueville et al [12] pointed out that some achievements have been made in the damage aspects such as crack initiation and propagation near the interface between solid propellant particles and matrix based on micro-CT. For example, Collins et al [13] and Lee et al [14] have obtained 3d images of propellant through micro-CT. However, in order to further study the damage evolution process of solid propellant under dynamic load, the advantages of CT in dynamic load in-situ loading device should be brought into full play.…”

Section: Introductionmentioning

confidence: 99%

“…Francqueville et al. [12] pointed out that some achievements have been made in the damage aspects such as crack initiation and propagation near the interface between solid propellant particles and matrix based on micro‐CT. For example, Collins et al.…”

Section: Introductionmentioning

confidence: 99%

Micromechanical Behavior of HTPB Propellant Bonding Interface under Uniaxial Tensile Loading

Pei

Wang

et al. 2022

Propellants Explo Pyrotec

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In order to study the mechanical behavior of solid rocket motor charge bonding interface under uniaxial tensile loading, the bonding interface of HTPB propellant/liner/insulator during uniaxial tensile process was scanned and reconstructed based on micro‐CT in‐situ loading, and the variation of porosity and interface debonding rate with strain was analyzed. A damage‐containing constitutive model based on the evolution of meso‐characteristic parameters was established for bonded interfacial components. The experimental analysis shows that the initial defects have a great influence on the location and evolution direction of the interface damage, and the interface damage can be quantitatively characterized by the interface debonding rate and porosity, and the interface debonding rate can better reflect the damage evolution process of micro‐pores and cracks near the propellant/liner interface. The damage‐containing constitutive model based on the evolution of mesoscopic characteristic parameters can effectively establish the structure‐activity relationship between mesoscopic parameters and macroscopic mechanical properties, and can predict the mechanical behavior of charge interface.

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“…The key to numerical simulation calculation lies in the acquisition of material parameters, in which the mechanical properties parameters of the propellant matrix and particles can be obtained through experiments, while the parameters between the interfaces need to be introduced into the cohesive force model 19 , 20 . At present, researchers have carried out a large number of mesoscopic simulation studies under uniaxial conditions 21 – 24 , but the research on propellants under biaxial conditions is not deep enough. Therefore, in order to study the damage evolution process of propellant under real loading conditions and explore its meso-damage mechanism, it is necessary to carry out the simulation calculation of solid propellant under biaxial loading conditions.…”

Section: Introductionmentioning

confidence: 99%

Biaxial tensile test and meso damage numerical simulation of HTPB propellant

Wang

et al. 2022

Sci Rep

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Aiming at the shortcomings of the current research on the mechanical properties of solid propellants under complex stress conditions, an effective cross-shaped test piece configuration and variable-scale biaxial tensile test method are designed in this paper, and the meso-simulation model of propellant is constructed by Micro-CT test and random filling algorithm. Then, based on the Hook-Jeeves method and the cohesive force model, the mechanical performance parameters of each mesoscopic component were obtained, and finally the damage evolution process of the propellant was numerically simulated. The results show that the stress–strain curve of the propellant under biaxial loading is similar to that of uniaxial stretching, and has obvious rate dependence and stress state dependence. The mechanical properties of the propellant under biaxial tensile loading are significantly lower than those in uniaxial stretching, and the maximum elongation is only 45–85% of that in uniaxial stretching. The fracture process of propellant can be divided into initial linear stage, damage evolution stage and fracture stage. The dewetting phenomenon generally occurs at the interface between the large-sized AP particles and the matrix. With the loading of the load, the pores formed by the dewetting and matrix tearing continue to converge into cracks and expand in the direction perpendicular to the resultant force, and finally fracture. The propellant dehumidifies more easily under high strain rate loading, but the degree of dewetting is lower when the same strain is reached.

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Use of a micromechanical approach to understand the mechanical behavior of solid propellants

Cited by 37 publications

References 34 publications

Numerical Conversion Method for the Dynamic Storage Modulus and Relaxation Modulus of Hydroxy-Terminated Polybutadiene (HTPB) Propellants

Numerical Conversion Method for the Dynamic Storage Modulus and Relaxation Modulus of Hydroxy-Terminated Polybutadiene (HTPB) Propellants

Micromechanical Behavior of HTPB Propellant Bonding Interface under Uniaxial Tensile Loading

Biaxial tensile test and meso damage numerical simulation of HTPB propellant

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