Active Sensing for Monitoring the Properties of Solid Rocket Motor Propellant Grains

Lopatin, Craig; Grinstein, Dan

doi:10.1002/prep.201400198

Cited by 13 publications

(6 citation statements)

References 22 publications

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“…As the main fuel for solid rocket motors, HTPB four-component propellant plays an important role in powering solid rocket motors (SRMs). From extensive studies [1][2][3][4], it has been shown that HTPB propellant is a typical viscoelastic material which exhibits strong strain-rate dependent properties. For different strain rate conditions, HTPB propellants exhibit different mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

A Rate‐Dependent Constitutive Model of HTPB Propellant Based on Parallel Rheological Framework

Zhou

et al. 2022

Propellants Explo Pyrotec

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Numerous studies have shown that highly strainrate dependent behavior is present in the mechanical properties of Hydroxyl-terminated polybutadiene(HTPB)propellants, and many experts and scholars have attempted to develop constitutive models to describe such rate-dependent properties of propellants. From the linear viscoelastic model to the Zhu-Wang-Tang model, the strainrate dependent properties of viscoelastic materials have been described to some extent. But due to the highly nonlinear mechanical behavior exhibited in propellant materials, the nonlinear behavior of propellants at different strain rates is difficult to be captured in the above constitutive models which are all based on linear elasticity. Therefore, in this paper, a nonlinear viscoelastic constitutive model was proposed based on the parallel rheological framework, in which the hyperelastic and viscoelastic flow laws were em-bedded. Because of the excellent ability to capture the nonlinear behavior of the material, the parallel rheological framework was used to predict the mechanical response at six sets of experiments with different rates. Surprisingly, this constitutive structure model performed good prediction of the mechanical properties of the material by comparison between theoretical calculations and experimental data. The constitutive model was verified by finite element method with numerical simulation software, and the robustness of the constitutive model was checked by a new set of experimental data. A good foundation was established for the accurate description of the propellant constitutive model strain-rate dependent characteristics by the results of this paper, which could provide a new method for the rapid prediction and evaluation of the propellant mechanical response.

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Section: Introductionmentioning

confidence: 99%

A Rate‐Dependent Constitutive Model of HTPB Propellant Based on Parallel Rheological Framework

Zhou

et al. 2022

Propellants Explo Pyrotec

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“…Riziotis et al (2013) used photonic polymer fiber to monitor the local deformation of propellant grains; it can detect changes of strain field caused by damage [14]. Lopatin and Grinstein [15] introduced an active monitoring method that combines magnetic induction for excitation and an optical fiber Bragg grating sensor to measure deformation of solid propellant without installing wires in rocket motors. These fiber Bragg techniques have been proved to be a means of studying grain integrity, but they are difficult to apply in practice because of the difficulties in signal interpretation and installation process.…”

Section: Introductionmentioning

confidence: 99%

Monitoring of Aging of Solid‐Rocket‐Motor HTPB Propellant Grains Using an Electromechanical Impedance Method

Lei-Guang

Wang

et al. 2022

Propellants Explo Pyrotec

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It is of great significance to monitor the aging state and evaluate the useful life of stored solid-rocket-motor (SRM) propellant grains. In this work, the aging state of hydroxyl terminated polybutadiene (HTPB) propellant grains was studied based on the electromechanical impedance (EMI) method. The relationship between the complex modulus and the mechanical impedance of viscoelastic material was derived. The finite element analysis of the structure with different moduli was carried out. The results show that the peak value of electromechanical impedance increases with an increase of propellant modulus. This report focuses on experimental research on monitoring the aging of cylindrical SRMs based on the EMI method. It is found that the peak of electromechanical impedance spectrum increases with aging time, while the peak frequency decreases slightly. As an aging damage variable, the root mean squared error (RMSD) of electromechanical impedance increases with aging time, and its growth rate is large at first, then decreases, and finally increases. Finally, a tensile test of aging propellant specimens was carried out, and the results show that the rate of change (ROC) of the modulus can be fit by a linear relationship to the RMSD of the electromechanical impedance.

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“…They detect delamination in the composite housings of rocket engines [ 31 , 32 ]. Polymer fibers [ 33 ] and fixed-in-fuel FBGs [ 34 , 35 , 36 ] have been used to control the state of solid fuel, but this research was conducted during storage and cannot provide information about the working process. Fiber sensors have been used to study rapidly occurring combustion, deflagration, and detonation in SRM [ 37 , 38 ].…”

Section: Introductionmentioning

confidence: 99%

Study of Intra-Chamber Processes in Solid Rocket Motors by Fiber Optic Sensors

Zhirnov

Stepanov

Sazonkin

et al. 2021

Sensors

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In this study, an experimental study of the burning rate of solid fuel in a model solid propellant rocket motor (SRM) E-5-0 was conducted using a non-invasive control method with fiber-optic sensors (FOSs). Three sensors based on the Mach–Zehnder interferometer (MZI), fixed on the SRM E-5-0, recorded the vibration signal during the entire cycle of solid fuel burning. The results showed that, when using MZI sensors, the non-invasive control of solid fuel burnout is made possible both by recording the time of arrival of the combustion front to the sensor and by analyzing the peaks on the spectrogram of the recorded FOS signal. The main mode of acoustic vibrations of the chamber of the model SRM is longitudinal, and it changes with time, depending on the chamber length. Longitudinal modes of the combustion chamber were detected by MZI only after the combustion front passed its fixing point, and the microphone was unable to register them at all. The results showed that the combustion rate was practically constant after the first second, which was confirmed by the graph of the pressure versus time at the nozzle exit.

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Active Sensing for Monitoring the Properties of Solid Rocket Motor Propellant Grains

Cited by 13 publications

References 22 publications

A Rate‐Dependent Constitutive Model of HTPB Propellant Based on Parallel Rheological Framework

A Rate‐Dependent Constitutive Model of HTPB Propellant Based on Parallel Rheological Framework

Monitoring of Aging of Solid‐Rocket‐Motor HTPB Propellant Grains Using an Electromechanical Impedance Method

Study of Intra-Chamber Processes in Solid Rocket Motors by Fiber Optic Sensors

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