Study on the Viscoelastic Damage Properties of NEPE Solid Propellant with Different Cyclic Stress Ratios

Hu, Qinwei; Fang, Qin‐Zhi; Sha, Baolin; Jin, Li

doi:10.1002/prep.202100342

Cited by 3 publications

(2 citation statements)

References 40 publications

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“…The nitrate ester plasticized polyether (NEPE) propellant has a much higher energy density than other propellants [1][2][3], and its mechanical, process, and safety properties are outstanding. Due to these excellent performances, the NEPE propellant has been widely used in SRM in recent years [4]. In terms of material composition, the NEPE propellant is a highly filled solid viscoelastic composite.…”

Section: Introductionmentioning

confidence: 99%

Research on Crack Propagation of Nitrate Ester Plasticized Polyether Propellant: Experiments and Simulation

Liu,

Wang,

2024

Materials

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To understand the fracture properties of the nitrate ester plasticized polyether (NEPE) propellant, single-edge notched tension (SENT) tests were carried out at room temperature (20 °C) under different tensile rates (10–500 mm/min). The mechanical response, crack morphology, evolution path, and crack propagation velocity during the fracture process were studied using a combination of a drawing machine and a high-speed camera. The mode I critical stress intensity factor KIc was calculated to analyze the tensile fracture toughness of the NEPE propellant, and a criterion related to KIc was proposed as a means of determining whether the solid rocket motors can normally work. The experimental results demonstrated that the NEPE propellant exhibited blunting fracture phenomena during crack propagation, resulting in fluctuating crack propagation velocity. The fracture toughness of the NEPE propellant exhibited clear rate dependence. When the tensile rate increased from 10 mm/min to 500 mm/min, the magnitude of the critical stress intensity factor increased by 62.3%. Moreover, numerical studies based on bond-based peridynamic (BBPD) were performed by modeling the fracture process of the NEPE propellant, including the crack propagation speed and the load–displacement curve of the NEPE propellant. The simulation results were then compared with the experiments.

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Section: Introductionmentioning

confidence: 99%

Research on Crack Propagation of Nitrate Ester Plasticized Polyether Propellant: Experiments and Simulation

Liu,

Wang,

2024

Materials

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“…Ran Wang [19] launched a method assesses friction-induced thermal safety of solid rocket motors under ultrahigh overloads, using a validated model to predict ignition and temperature distribution, highlighting ignition likelihood at the propellant grain's bottom surface. Qinwei Hu [21] examines viscoelastic damage properties of NEPE solid propellant, presenting a model that accurately predicts creep and fatigue damage evolution and fatigue life under various stress ratios.…”

Section: Introductionmentioning

confidence: 99%

Fatigue failure of incorporated crack HTPB(Hydroxyl-terminated polybutadiene) propellant under strain control

Li,

Gao,

et al. 2024

Preprint

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To study the fatigue properties of incorporated crack HTPB (hydroxyl terminated polybutadiene propellant) propellant under strain control, fatigue tests with different strain amplitudes were carried out on the MTS fatigue testing machine. Four groups of specimens were set up in this test, namely one group with specimens and three groups with incorporated crack specimens with different angles (0°/45°/75°/ to the horizontal) of cracks. During the fatigue test, an infrared camera was used to monitor the temperature of the whole test piece in the whole process. The results show that at the same frequency, the increase of the strain amplitude will shorten the fatigue life. The fatigue life of the three incorporated crack specimens is similar reaching at 20000times, all in the same order of magnitude, and the fatigue life of the un-cracked specimen is larger reaching at 100000times, showing a cross-order phenomenon. In the fatigue test, the samples exhibit obvious strain hysteresis phenomenon and has significant viscoelastic material properties, in terms of the surface temperature monitoring of the specimens, the four groups of specimens all show a trend of temperature increase, and the final surface temperature and fatigue life are positive related.

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Research on the low-frequency fatigue behavior of NEPE solid composite propellant based on fractional derivative constitutive model

Zhang,

Lei

et al. 2024

International Journal of Solids and Structures

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Study on the Viscoelastic Damage Properties of NEPE Solid Propellant with Different Cyclic Stress Ratios

Cited by 3 publications

References 40 publications

Research on Crack Propagation of Nitrate Ester Plasticized Polyether Propellant: Experiments and Simulation

Research on Crack Propagation of Nitrate Ester Plasticized Polyether Propellant: Experiments and Simulation

Fatigue failure of incorporated crack HTPB(Hydroxyl-terminated polybutadiene) propellant under strain control

Research on the low-frequency fatigue behavior of NEPE solid composite propellant based on fractional derivative constitutive model

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