Biaxial tensile test and meso damage numerical simulation of HTPB propellant

Wang, Qizhou; Wang, Guang; Wang, Zhejun; Hu, Qiang; Wang, Xueren; Li, Shiqi; Zhu, Zhaojun

doi:10.1038/s41598-022-22726-8

Cited by 7 publications

(1 citation statement)

References 29 publications

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“…Its structural integrity determines the reliable operation and storage life of SRMs [ 1 , 2 ]. Throughout the life cycle of an SRM, the propellant grain must withstand various types of loads, including temperature, gravity, vibration, ignition impact, and axial overload, among others [ 3 , 4 , 5 ]. These loads can cause complex physical and chemical changes in the internal structure of the propellant grain over time [ 6 ], ultimately leading to an uneven distribution of the mechanical properties of the propellant grain.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mechanical Heterogeneity on the Structural Integrity of HTPB Propellant Grain

et al. 2023

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To investigate the structural effects of the mechanical heterogeneity of Hydroxyl-terminated polybutadiene (HTPB) propellant grain under ignition pressurization, a gradient finite element method was proposed to evaluate its structural integrity. The heterogeneous mechanical properties of the propellant grain were constructed and assessed. The results demonstrate that the mechanical properties of the propellant grain are spatially variable when taking into account the effect of the load. The range of variation in the mechanical properties is related to the size of the load and its effect on the mechanical properties of the propellant. Two key parameters that affect the mechanical response of the grain are the non-uniform distribution of the modulus and the damage strain threshold. An increase in the propellant modulus leads to an increase in the stress response and a decrease in the strain response of the propellant grain under ignition pressurization. Meanwhile, an increase in the damage strain threshold improves the propellant’s modulus in the linear elastic stage in a disguised form. This also leads to an increase in the stress response and a decrease in the strain response when the strain response exceeds the damage strain threshold. The safety factor, based on the equivalent strain failure criterion of the grain, directly depends on both the strain response of the propellant grain and the maximum elongation of the propellant. Furthermore, the change in the safety factor of two propellant grains is primarily affected by the maximum elongation of the propellant.

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Section: Introductionmentioning

confidence: 99%

Effect of Mechanical Heterogeneity on the Structural Integrity of HTPB Propellant Grain

et al. 2023

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Mechanical properties and influence mechanism of hydroxyl‐terminated polybutadiene propellant under confining pressure

Tingyu

Chen

et al. 2023

J of Applied Polymer Sci

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To better understand the mechanical properties and influence mechanism of hydroxyl-terminated polybutadiene (HTPB) propellant under various confining pressures, the uniaxial tension tests with low to medium strain rate and various confining pressures were carried out. The coupling effects of strain rate and confining pressure on mechanical properties were presented. Meanwhile, the confining pressure influence mechanism was analyzed and revealed using the meso numerical simulation method and scanning electron microscopy images of fracture surfaces. The meso damage evolution processes under various confining pressures were presented. The results show that strain rate and confining pressure affect mechanical responses of HTPB propellant significantly. As confining pressure increases, the maximum tension strength and fracture strength increase. The maximum tension strain and failure strain vary slightly with confining pressure under low strain rate, while they increase significantly with confining pressure at medium strain rate. The fracture energy density increases with the increase of strain rate and confining pressure. Meanwhile, the value of saturation pressure depends on strain rate. The confining pressure influence mechanism is to suppress dewetting damage initiation and evolution. Besides, the failure mode of HTPB propellant under different confining pressures is still particles dewetting.

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Interfacial debonding and cracking in a solid propellant composite under uniaxial tension: An in situ synchrotron X-ray tomography study

Lai,

Sang,

Bian

et al. 2024

Composites Science and Technology

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Biaxial tensile test and meso damage numerical simulation of HTPB propellant

Cited by 7 publications

References 29 publications

Effect of Mechanical Heterogeneity on the Structural Integrity of HTPB Propellant Grain

Effect of Mechanical Heterogeneity on the Structural Integrity of HTPB Propellant Grain

Mechanical properties and influence mechanism of hydroxyl‐terminated polybutadiene propellant under confining pressure

Interfacial debonding and cracking in a solid propellant composite under uniaxial tension: An in situ synchrotron X-ray tomography study

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