Microstructural simulations of debonding, nucleation, and crack propagation in an HMX-MDB propellant

Hou, Yufei; Xu, Jie; Zhou, Changsheng; Chen, Xiong

doi:10.1016/j.matdes.2021.109854

Cited by 28 publications

(12 citation statements)

References 33 publications

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“…Due to dual strain rates procedure was not designed in new experimental system, the dual strain rates tests were carried out through electronic universal testing machine (QJ211) 1 at room pressure. The first group of test is that the CSP specimen was initially loaded at 1.190 × 10 –2 s −1 , upon reaching a strain of 0.08, and the strain rate increased to 1.190 × 10 –1 s −1 .…”

Section: Model Parameters Identification and Validationmentioning

confidence: 99%

“…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%

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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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Section: Model Parameters Identification and Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Chen

et al. 2023

Sci Rep

Self Cite

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“…35 Hence, a twodimensional randomly filled RVE of HTPB propellant with a size of 1000 μm Â 1000 μm was constructed using a Fortran program, as shown in Figure 9. 20 The RVE is filled with three sizes of AP particles, which are 200-300 μm, 100-200 μm, and 25-100 μm. Different sizes of AP particles were marked in various colors.…”

Section: Computational Modelmentioning

confidence: 99%

“…18,19 Under external load, due to the mismatch of stiffness between particles and matrix, a few local stress concentration phenomena would be generated at the filler particles-matrix interfaces, leading to the appearance of holes along the particle interface, namely "dewetting," thus changing the whole meso-structure of solid propellant. 20 Therefore, to understand the link between the meso-structure and macro mechanical responses of solid propellant or reveal the influence mechanism of external loading condition, the microscopic observation technology are adopted to research the meso damage evolution of solid propellant under different environmental conditions. [21][22][23][24] For example, according to digital image correlation (DIC) method, Miller investigated the formulation and pre-strain damage on dilatation behaviors caused by dewetting.…”

Section: Introductionmentioning

confidence: 99%

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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“…Zhang et al [25] used the surface-based cohesive behavior to simulate particle debonding and the impact of model parameters in the cohesive zone, and the results indicated that the critical contact stress and critical contact failure distance were the main variables affecting the mechanical properties of propellant. Hou et al [26] established a piecewise CZM to describe the stress-strain response caused by matrix fracture and particle-matrix interface debonding, and revealed the damage mode of CMDB propellant. Both particle-matrix interfacial debonding and internal cracking are responsible for the damage of propellants containing particulate inclusions.…”

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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Microstructural simulations of debonding, nucleation, and crack propagation in an HMX-MDB propellant

Cited by 28 publications

References 33 publications

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

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

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

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

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