Effect of Microstructure on Micro-Mechanical Properties of Composite Solid Propellant

Li, Tianpeng; Xu, Jie; Han, Junli; He, Yong

doi:10.3390/mi12111378

Cited by 6 publications

(3 citation statements)

References 18 publications

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“…When the strain to a certain value, the propellant is in the nonlinear region, at which time th stress growth with strain slows down slightly, indicating that the stiffness of th decreases. According to reference [26], microcracks or micropores begin to app the interface in the loading direction, that is, "dewetting" occurs in the nonline It indicates that larger particles are prone to dewetting, and the dewetting site fir in the larger particles and larger particles aggregation area. In the larger partic gation area, the interaction between the particles leads to stress bridging, resu stress concentration phenomenon, leading to more serious dewetting [27].…”

Section: Mechanical Response Analysismentioning

confidence: 99%

Study on Mechanical Properties and Failure Mechanisms of Highly Filled Hydroxy-Terminated Polybutadiene Propellant under Different Tensile Loading Conditions

Wu,

Lu,

Jiang

et al. 2023

Polymers

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To study the mechanical properties of highly filled hydroxy-terminated polybutadiene (HTPB) propellant with 90 wt% solid fillers, the stress–strain curves of the propellant under different temperatures (−50 to 70 °C) and strain rates (0.000476 to 0.119048 s−1) were obtained by uniaxial tensile test. Moreover, to obtain the glass transition temperature and understand the effect of low temperatures on the mechanical properties of the propellant, DMA experiments were carried out. On this basis, the mechanical response laws of the propellant were analyzed, and the master curves of mechanical properties were established. Furthermore, the fracture features of the propellant under typical loading conditions were obtained by SEM, and the corresponding failure mechanisms were analyzed. The results show that the maximum strength decreases with increasing temperature, while the maximum elongation increases with increasing temperature at the same strain rate. The maximum tensile strength increases with increasing strain rate, while the maximum elongation decreases with increasing strain rate at the same temperature. The maximum tensile strength is lowest with a value of 0.35 MPa when the temperature is 343.15 K and the strain rate is 0.000476 s−1, at which time the maximum elongation reaches the highest with a value of 44%. In terms of failure mechanisms, the propellant shows no particle fracture, and the failure modes of the propellant are mainly matrix tearing and dewetting.

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Section: Mechanical Response Analysismentioning

confidence: 99%

Study on Mechanical Properties and Failure Mechanisms of Highly Filled Hydroxy-Terminated Polybutadiene Propellant under Different Tensile Loading Conditions

Wu,

Lu,

Jiang

et al. 2023

Polymers

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show abstract

“…Belli et al 25 found that in ceramic materials, a high crystal aspect ratio is usually more resistant to fracture than a low crystal aspect ratio, and proposed to improve the mechanical properties of glass‐ceramics by appropriately increasing the crystal aspect ratio. It has been found that the differences in the mechanical properties of materials with similar chemical compositions are mainly due to differences in their microstructure 26–28 . The orientation, distribution, shape, ratio of glassy to crystalline phases and the homogeneity of the distribution determine the bending strength and fracture toughness of glass‐ceramics 29–31 .…”

Section: Introductionmentioning

confidence: 99%

“…It has been found that the differences in the mechanical properties of materials with similar chemical compositions are mainly due to differences in their microstructure. [26][27][28] The orientation, distribution, shape, ratio of glassy to crystalline phases and the homogeneity of the distribution determine the bending strength and fracture toughness of glassceramics. [29][30][31] Feng et al 32 demonstrated that by manipulating the sintering process, in situ crystal formation can cause some grains to grow into elongated grains with a high length-to-diameter ratio, resulting in a microstructure comparable to that of fiber or whisker-reinforced composites.…”

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confidence: 99%

Biosafety and chemical solubility studies of multiscale crystal‐reinforced lithium disilicate glass‐ceramics

Zhang,

Liu,

et al. 2024

J Biomed Mater Res

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Lithium disilicate (Li2Si2O5) glass‐ceramics are currently a more widely used all‐ceramic restorative material due to their good mechanical properties and excellent aesthetic properties. However, they have a series of problems such as high brittleness and low fracture toughness, which has become the main bottleneck restricting its development. Therefore, in order to compensate for these shortcomings, we propose to prepare a reinforced glass‐ceramics with better mechanical properties and to test the biosafety and chemical solubility of the material. Li2Si2O5 whiskers were synthesized by a one‐step hydrothermal method, and multi‐scale crystal‐enhanced Li2Si2O5 glass‐ceramics were prepared by reaction sintering. The biosafety of multi‐scale crystal‐reinforced Li2Si2O5 glass‐ceramics was investigated by in vitro cytotoxicity test, rabbit pyrogen test, mice bone marrow micronucleus test, skin sensitization test, sub‐chronic systemic toxicity test, and chronic systemic toxicity test. Additionally, the chemical solubility of multi‐scale crystal‐reinforced Li2Si2O5 glass‐ceramics was investigated. The test results showed that the material was non‐cytotoxic, non‐thermogenic, non‐mutagenic, non‐sensitizing, and non‐systemic. The chemical solubility, determined to be 377 ± 245 μg/cm2, complied with the ISO 6872 standard for the maximum solubility of ceramic materials. Multi‐scale crystal‐reinforced Li2Si2O5 glass‐ceramics' biosafety and chemical solubility met current normative criteria, and they can move on to mechanical property measurements (such as flexural strength test, fatigue life test, friction and wear property study, etc.) and bonding property optimization, which shows promise for future clinical applications.

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Microstructural Simulations of Polymer Composites by a Viscoelastic Spring Lattice Model

Xu,

Hu,

Huang

2024

Macro Theory & Simulations

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An improved viscoelastic spring lattice model was used to analyse the mechanical properties of polymer composites containing different microstructures, as exemplified by HTPB‐based solid propellants. A drop‐on‐demand structural model was programmed using the C language to simulate the real solid propellant microstructure. The results show that increasing the particle content has a positive effect on the tensile strength of the propellant, but is detrimental to the ductility. The increase in particle size decreases the maximum tensile strength of the material, reflecting the importance of the dewetting process in the microstructure analysis. Finally, the model accurately predicts that initial defects have a destructive effect on the mechanical properties of the materialThis article is protected by copyright. All rights reserved

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Effect of Microstructure on Micro-Mechanical Properties of Composite Solid Propellant

Cited by 6 publications

References 18 publications

Study on Mechanical Properties and Failure Mechanisms of Highly Filled Hydroxy-Terminated Polybutadiene Propellant under Different Tensile Loading Conditions

Study on Mechanical Properties and Failure Mechanisms of Highly Filled Hydroxy-Terminated Polybutadiene Propellant under Different Tensile Loading Conditions

Biosafety and chemical solubility studies of multiscale crystal‐reinforced lithium disilicate glass‐ceramics

Microstructural Simulations of Polymer Composites by a Viscoelastic Spring Lattice Model

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