Long‐Term and Short‐Term Creep Characteristic Analysis for HTPB Propellant

Deng, Kuangwei; Li, Haiyang; Xu, Jie; Cui, Huiru; Shen, Zhi-Bin

doi:10.1002/prep.202200074

Cited by 4 publications

(3 citation statements)

References 10 publications

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“…Assuming that the effect of damage on the mechanical properties of propellants is isotropic, according to ( 13), (14), and ( 17), the three-dimensional form of viscoelastic creep damage constitutive equation can be formulated as follows:…”

Section: Creep Constitutive Modelmentioning

confidence: 99%

“…Their study indicated that the generalized Kelvin model could effectively capture the creep behavior of double-base solid propellant. Deng et al [14] provided a mechanical test procedure for assessing the long-term creep behavior of HTPB propellant. They conducted an analysis of the propellant's long-term creep properties by employing a Modified Burgers model.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on A Viscoelastic Creep Damage Constitutive Model for HTPB Propellant and Its Application in Finite Element Analysis

Yanshen Zhang

2024

jes

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Solid rocket motor (SRM) is typically kept in storage for a significant portion of its lifespan. During storage, the propellant grain creeps under the action of gravity. To investigate the creep properties of hydroyl-terminated polybutadiene (HTPB) propellant under long-term loading, a creep damage constitutive model is developed based on the generalized Kelvin model and continuum damage mechanics theory. Parameters for this model are determined through creep tests conducted on HTPB propellant under various stress levels. Furthermore, to enable the application of the developed propellant constitutive model in the finite element analysis of SRM, the derived constitutive equation is transformed into an incremental form and integrated into the user subroutine UMAT of the finite element analysis platform ABAQUS. Subsequent to this, a three-dimensional SRM model containing the case, the insulator, and the propellant grain is established. The mechanical response of the grain under thermal and gravitational loads is calculated and analyzed. The results indicate that the stress concentration region in the grain is located at the stress release boot in the forward dome of the motor, where damage occurs. The methods employed in this paper and the conclusions drawn can serve as a reference for evaluating the structural integrity and storage lifespan of the SRM.

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Section: Creep Constitutive Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation on A Viscoelastic Creep Damage Constitutive Model for HTPB Propellant and Its Application in Finite Element Analysis

Yanshen Zhang

2024

jes

View full text Add to dashboard Cite

show abstract

“…During the long-term storage of the propellant, it would experience the creep, causing the increment of the porosity, generation of voids, and loss of humidity. Conducting creep experiments has been a common practice for the testing and NDE/SHM method development for SRM propellants [32][33][34][35]. The specimen was suspended by four steel ropes pulling on a smooth gripper to the top of a fixture shelf.…”

Section: Experimental Verification and Demonstration Of Viscoelastic ...mentioning

confidence: 99%

Health monitoring of high-damping viscoelastic materials using sub-resonator enriched electro-mechanical impedance signatures

Lu¹,

Shen²,

Qu³

et al. 2022

Smart Mater. Struct.

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This article presents a recent progress of Electromechanical Impedance Spectroscopy (EMIS) methodology for monitoring high-damping viscoelastic materials (solid rocket motor propellant for instance). It employs piezoelectric wafer active sensors (PWAS) with sub-resonators which can create additional resonance peaks for enriching the diagnostic information. In order to develop an in-depth understanding of the mechanism behind the sub-resonator sensor system, an analytical investigation is conducted first. The theoretical formulation treats the sub-resonator PWAS as a mass-in-mass model, which can be seamlessly merged into the traditional 1-D constrained PWAS case. The analytical solution for the impedance signature of the new sub-resonator PWAS transducer is derived. Meanwhile, parametric case studies are carried out to analyze the influence of material damping and additional mass of the sub-resonators on the impedance signature. Moreover, numerical simulations are performed to demonstrate the effectiveness of the new sensor creating additional resonance peaks. Comparative investigations are carried out with both conventional PWAS and the sub-resonator PWAS. EMI damage indices based on the spectral amplitude and frequency variation features are used to quantify the material degradation. Additionally, the performance of the proposed sub-resonator PWAS is demonstrated via a material creep experiment. The article finishes with summary, concluding remarks, and suggestions for future work.

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Shear creep analysis of solid rocket motor bonding interface and rapid prediction model**

Ye,

Deng,

et al. 2023

Propellants Explo Pyrotec

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During vertical storage of solid rocket motors, shear creep behavior occurred at the sidewall bonding interface due to self‐weight load, threatening the structural safety and storage life of the motor. To study the shear creep characteristics of the bonding interface, shear creep tests were conducted on a shear interface test piece of a motor under various temperatures and stresses. An engineering criterion for the onset of nonlinear viscoelastic stage of the bonding interface was proposed, and a rapid prediction model for shear creep of motor bonding interface in linear viscoelastic stage was devised. Furthermore, the stress‐time master curve of shear creep compliance at the bonding interface was established, revealing the variation trend of shear creep compliance during long‐term creep process. The results showed that this rapid prediction model had simple construction, high accuracy and wide applicability, and could well predict short‐term creep behaviour of bonding interface in linear viscoelastic stage. A method for structural integrity assessment of vertically stored solid rocket motors could be provided by using these research methods and results.

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Long‐Term and Short‐Term Creep Characteristic Analysis for HTPB Propellant

Cited by 4 publications

References 10 publications

Investigation on A Viscoelastic Creep Damage Constitutive Model for HTPB Propellant and Its Application in Finite Element Analysis

Investigation on A Viscoelastic Creep Damage Constitutive Model for HTPB Propellant and Its Application in Finite Element Analysis

Health monitoring of high-damping viscoelastic materials using sub-resonator enriched electro-mechanical impedance signatures

Shear creep analysis of solid rocket motor bonding interface and rapid prediction model**

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