Simulations of meso-scale deformation and damage of polymer bonded explosives by the numerical manifold method

Kang, Ge; Chen, Pengwan; Guo, Xuan; Ma, Guowei; Ning, Youjun

doi:10.1016/j.enganabound.2018.08.011

Cited by 23 publications

(7 citation statements)

References 33 publications

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“…Numerous experiments have demonstrated that the ultrasonic propagation characteristics of the RDX/Estane two-phase PBX are related to the viscoelasticity of the material, density, and frequency of the sound wave. As the density and frequency increase, the corresponding ultrasonic attenuation coefficient increases with a positive correlation [22,23]. In addition, the relationship between the attenuation coefficient and the ultrasonic frequency has a cubic polynomial fitting form:…”

Section: Acoustic Characteristics Of the Pbx Composite Materialsmentioning

confidence: 99%

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Meso-Simulation and Experimental Research on the Mechanical Behavior of an Energetic Explosive

Pan

Liu

et al. 2021

Coatings

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This study establishes a model for polymer-bonded explosives (PBX) using Digimat-FE. The model identifies the relationship between the material’s effective elastic modulus and the explosive particle volume fraction, shape and gradation, and porosity, as well as other factors. Further, finite element analysis of the stress distribution of the PBX composite material is performed, and the mathematical models between the ultrasonic attenuation coefficient, particle volume fraction, and ultrasonic frequency are established. Finally, an efficient ultrasonic nondestructive testing system is designed to determine the stress distribution and fine crack groups in the material. Experimental results indicate that the relative error of stress detection is within 15%, which meets the requirements of engineering applications.

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Section: Acoustic Characteristics Of the Pbx Composite Materialsmentioning

confidence: 99%

“…where f is the ultrasonic frequency and α is the ultrasonic attenuation coefficient. However, the experimental results [22,23] are only applicable to experimental systems and their associated equipment. In the modeling process for this study, RDX explosive particles and an Estane binder are used.…”

Section: Acoustic Characteristics Of the Pbx Composite Materialsmentioning

confidence: 99%

Meso-Simulation and Experimental Research on the Mechanical Behavior of an Energetic Explosive

Pan

Liu

et al. 2021

Coatings

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“…High explosives are mixtures of a large volume of hard explosive particles (90-95% by weight) and a small percentage of soft binder [2]. Young's modulus of soft binders is typically three to four orders of magnitude lower than that of explosive grains [3,4]. e key macro properties of high explosives including sensitivity to shock, the possibility of initiation, and the subsequent chemical reaction are known to be controlled by processes occurring at their microstructure level [5].…”

Section: Introductionmentioning

confidence: 99%

Microstructure Characterization of High Explosives by Wavelet Transform

Jia

Cao

Han

et al. 2022

Mathematical Problems in Engineering

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The key macro properties of high explosives including sensitivity to shock, the possibility of initiation, and the subsequent chemical reaction are known to be controlled by processes occurring at their microstructure level. However, there is a lack of an easy, effective, and accurate method to quantify the microstructure, termed as fabric, of high explosives despite an abundance of evidence regarding its importance. This study proposes a rotational Haar wavelet transform (RHWT) method to characterize the fabric of high explosives from two-dimensional images, yielding key fabric parameters including rose diagram, fabric direction, and degree of fabric anisotropy. The fabric tensor commonly used in numerical simulations and constitutive models can also be determined by RHWT. The RHWT was implemented on microscopic images of six high explosives captured by various imaging techniques including scanning electrical microscopy, polarized light microscopy, and micro X-ray computed tomography. Despite these variables, the proposed RHWT successfully identifies fabric in these images, demonstrating robustness and validity of RHWT.

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“…The numerical manifold method (NMM), 43 which integrates the continuum‐based method FEM and discontinuum‐based method DDA in a unified framework, 44 has powerful capabilities in modeling rock failure process involving continuous‐discontinuous behavior 45–53 . However, most NMM‐based studies focused on the macroscopic behavior of rocks regardless of its microscopic mechanisms 66 , 67 .…”

Section: Introductionmentioning

confidence: 99%

“…By incorporating a coupled hydro‐mechanical model, the micro‐mechanical based NMM was extended for hydraulic fracturing modeling at micro‐scale 55 . From its unique hybrid characteristics and excellent performance in rock microscopic analysis, 46,54,55 the NMM shows the following considerable potentials in soil microscopic modeling: (1) With the adoption of the simplex integration method, soil grains of arbitrary shape can be considered for more realistically representing soil skeleton; (2) By the NMM contact technique, the interaction and motion of soil grains can be accurately captured; (3) As a block composed of multiple manifold elements (ME), the deformation of soil grain can be obtained with higher accuracy compared with the DEM using constant strain elements or rigid particles (4) based on the two covers system, an explicit representation of transgranular cracking of soil grains can be straightforwardly achieved. However, at present, the NMM has no application in soil microscopic analysis.…”

Section: Introductionmentioning

confidence: 99%

An extended numerical manifold method for unsaturated soil‐water interaction analysis at micro‐scale

Sun

Zheng

et al. 2021

Num Anal Meth Geomechanics

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To investigate unsaturated soil‐water interaction at micro‐scale, this study extends the numerical manifold method (NMM) by incorporating a soil‐water coupling model considering specific capillary water distribution and capillary force calculation. The soil skeleton is constructed by a soil skeleton generation algorithm with random polygons. To more realistically capture the interaction between soil grains and capillary water, a capillary mechanics‐based geometric algorithm is proposed to iteratively calculate the capillary water distribution. The capillary forces corresponding to the capillary water distribution are calculated based on the Young‐Laplace equation. The proposed capillary water solving framework is first verified by reproducing the soil‐water characteristic curve and the capillary water distribution of an ideal contact‐disk model against analytical solutions. To further validate the ability of the capillary water solving framework to predict hydraulic behavior of the real soil, a laboratory test on the Toyoura sand is reproduced numerically. Then an ideal direct shear test is performed to further validate the two‐way soil‐water coupling procedure, in which a comparison between the numerical and analytical results regarding the shear strength and matric suction is presented. Finally, microscopic hydraulic and compression tests are conducted on two soil specimens with the same porosity and mean grain diameter but different uniformity coefficients. The results elucidate that the extended method is a potential tool to explore unsaturated soil behaviors at micro‐scale.

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Simulations of meso-scale deformation and damage of polymer bonded explosives by the numerical manifold method

Cited by 23 publications

References 33 publications

Meso-Simulation and Experimental Research on the Mechanical Behavior of an Energetic Explosive

Meso-Simulation and Experimental Research on the Mechanical Behavior of an Energetic Explosive

Microstructure Characterization of High Explosives by Wavelet Transform

An extended numerical manifold method for unsaturated soil‐water interaction analysis at micro‐scale

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