Mechanical Behaviors and Constitutive Relations under wide strain rate range for CMDB propellant

Li, Meng; Li, Zhihui; He, He; Chen, Lianyang; Miao, Yaping

doi:10.1016/j.polymertesting.2022.107806

Cited by 8 publications

(4 citation statements)

References 24 publications

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“…Upon entering the "damage evolution and crack propagation" region (Curve BD in Figure 23), a typical damage phenomenon is observed within the NEPE propellant. This result is consistent with the experimental study presented in the literature [8]. The output result of BBPD can be visualized to obtain the crack phase-field diagram, which allows for a visual description of the change in damage degree of each part of the propellant material during the tensile fracture process.…”

Section: Numerical Calculation Of Bbpdsupporting

confidence: 88%

“…The tensile fracture test can reveal the critical value of propellant fracture parameters, observe the crack propagation evolution, and analyze the stress-strain distribution and damage degree at the crack tip [8][9][10]. In a previous study, Wang et al studied the impact of loading rates on the fracture properties of composite propellants [11].…”

Section: Introductionmentioning

confidence: 99%

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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: Numerical Calculation Of Bbpdsupporting

confidence: 88%

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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“…Solid rocket motors (SRMs) are devices powered by burning solid propellants, which enjoy the advantages of high energy density, simple structure, and low cost, and have been widely used in military weapons and aerospace application [1]. Composite modified double base (CMDB) propellants are a popular solid fuel that is utilized in rocketry systems owing to its excellent advantages, such as superior combustion performance, mature processing technology and low characteristic signature [2][3][4]. In terms of constituent, CMDB propellant can be categorized as quintessential composite materials, which contains nitrocellulose (NC) as binder matrix, nitroglycerin (NG) as plasticizer, and high explosive particles such as cyclotrimethylene trinitramine (RDX) incorporated as solid filler.…”

Section: Introductionmentioning

confidence: 99%

Correlation between microstructural evolution and mechanical properties of CMDB propellant during uniaxial tension

Wu,

Liu,

et al. 2023

Propellants Explo Pyrotec

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Numerical simulation of the deformation and damage evolution process of composite modified double base (CMDB) propellant based on the microstructure is of great significance for improving its macro‐mechanical properties. The macro‐mechanical properties and damage evolution of CMDB propellant were studied experimentally and numerically in current work. To establish the correlation between microstructural evolution and the macro‐mechanical response of the propellant, a three‐dimensional microstructure model of the CMDB propellant was constructed utilizing the molecular dynamics particle filling approach. At the interface between RDX particles and the nitrocellulose‐nitroglycerine (NC‐NG) matrix, the conventional cohesive element was replaced by cohesive contact, and the parameters of the cohesive zone model (CZM) at the interface between the particles and the matrix were obtained by parameter inversion based on the Hooke‐Jeeves parameter optimization algorithm. The processes of damage initiation, propagation, convergence, and failure at the cohesive interface were simulated using the bilinear cohesive zone model (BCZM). The results revealed that the fracture strength of NC‐NG propellant with added RDX particles was significantly increased and the fracture elongation was reduced. The three‐dimensional microstructure model can accurately describe the microstructure of CMDB, and dewetting at the interface is the primary cause of propellant degradation when subjected to an external load, which compromises the mechanical properties of the propellant.

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“…During the service life of CSP grains, they will be subjected to various loads, such as the temperature load from change of environmental conditions, vibration load from transportation, and pressure load from ignition pressurization process. Under these loads, the microstructure of CSP changes, including dewetting along interfaces between filler particles and binder, and nucleation and growth of micro-voids 1 , 2 . As a result, CSP usually exhibits nonlinear and complex mechanical behaviors in macroscopic level.…”

Section: Introductionmentioning

confidence: 99%

A nonlinear viscoelastic constitutive model with damage and experimental validation for composite solid propellant

Chen

et al. 2023

Sci Rep

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The development of a nonlinear viscoelastic constitutive model of composite solid propellant (CSP) coupled with effects of strain rate and confining pressure is essential to assess the reliability of solid propellant grains during ignition operation process. In the present work, a nonlinear viscoelastic constitutive model with novel energy-based damage initiation criterion and evolution model was firstly proposed to describe the coupled effects of confining pressure and strain rate on mechanical responses of CSP. In the developed damage initiation criterion and evolution model, the linear viscoelastic strain energy density was introduced as the damage driving force, and the coupled effects of strain rate, damage history and confining pressure on damage growth were taken into account. Then, uniaxial tensile tests from low strain rates to medium strain rates and various confining pressures, and stress relaxation tests were conducted using a self-made active confining pressure device. Finally, the identification procedures of model parameters and validation results of the constitutive model were presented. Moreover, the master curve of damage initiation parameter was constructed through the time-pressure superposition principle (TPSP). The results show that the developed nonlinear constitutive model is capable of predicting the stress–strain responses of CSP under different strain rates and confining pressures.

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Mechanical Behaviors and Constitutive Relations under wide strain rate range for CMDB propellant

Cited by 8 publications

References 24 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

Correlation between microstructural evolution and mechanical properties of CMDB propellant during uniaxial tension

A nonlinear viscoelastic constitutive model with damage and experimental validation for composite solid propellant

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