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Zhai, Jun; Zhou, Min

doi:10.1023/a:1007545105723

Cited by 55 publications

(5 citation statements)

References 45 publications

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“…In this study, a cohesive finite element method (CFEM)-based framework is developed and used, accounting for microstructure and the thermal-mechanical processes outlined above. Such a framework has been extensively used to study a wide variety of issues related to delamination and fracture such as tensile decohesion [25], quasi-static crack growth [26], ductile fracture [27,28], dynamic fracture [29], dynamic fragmentation [30,31], delamination in composites [32,33] and microstructural fracture [34]. Here, cohesive elements are embedded throughout the microstructure, along all elements boundaries, as in [34].…”

Section: Introductionmentioning

confidence: 99%

“…Such a framework has been extensively used to study a wide variety of issues related to delamination and fracture such as tensile decohesion [25], quasi-static crack growth [26], ductile fracture [27,28], dynamic fracture [29], dynamic fragmentation [30,31], delamination in composites [32,33] and microstructural fracture [34]. Here, cohesive elements are embedded throughout the microstructure, along all elements boundaries, as in [34]. This approach allows arbitrary fracture paths and patterns inside each phase and along the interfaces between the phases to be resolved.…”

Section: Introductionmentioning

confidence: 99%

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A Lagrangian framework for analyzing microstructural level response of polymer-bonded explosives

Barua¹,

Zhou²

2011

Modelling Simul. Mater. Sci. Eng.

143

102

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A cohesive finite element method (CFEM) framework for quantifying the thermomechanical response of polymer-bonded explosives (PBXs) at the microstructural level is developed. The analysis carried out concerns the impact loading of HMX/Estane at strain rates on the order of 104–105 s−1. Issues studied include large deformation, thermomechanical coupling, failure in the forms of microcracks in both bulk constituents and along grain/matrix interfaces, and frictional heating. The polymer matrix is described by a thermo-elasto-viscoelastic constitutive formulation, accounting for temperature dependence, strain rate sensitivity and strain hardening. The HMX crystals are assumed to be elastic. The CFEM framework allows the contributions of individual constituents, fracture and frictional contact along failed crack surfaces to heating to be tracked and analyzed. Digitized micrographs of actual PBX materials and idealized microstructures with Gaussian distributions of grain sizes are used in the analysis. The formation of local hot spots as potential ignition sites is primarily due to the viscoelastic dissipation in the matrix in early stages of deformation and frictional heating along crack surfaces in later stages of deformation. The framework is a useful tool for the design of energetic composites and the results can be used to establish microstructure–response relations that can be used to assess the performance of energetic composites.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Lagrangian framework for analyzing microstructural level response of polymer-bonded explosives

Barua¹,

Zhou²

2011

Modelling Simul. Mater. Sci. Eng.

143

102

View full text Add to dashboard Cite

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“…Assuming a linear association between the Green-St and the second Piola–Kirchhoff stress tensor S is another possibility. Venant strain tensor E [ [182] , [183] , [184] ]. These two relations are decreased to Hooke's law for infinitesimal deformations.…”

Section: Classifying the Constitutive Relationsmentioning

confidence: 99%

Extensive overview of soil constitutive relations and applications for geotechnical engineering problems

Onyelowe

Ebid

Sujatha

et al. 2023

Heliyon

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“…This model approach has later been applied to investigate the effects of preexisting cracks on tensile strength of granite subjected to high strain rates [41] and the contact-induced damage from cyclic and monotonic indentation of granite [34]. A micromechanical fracture model of a heterogeneous ceramic composite was developed by Zhai and Zhou [56]. Here, the arbitrary microstructure was explicitly accounted for and the authors were able to analyse the crack propagation and branching.…”

Section: Introductionmentioning

confidence: 99%

A statistical DEM approach for modelling heterogeneous brittle materials

et al. 2021

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By utilizing numerical models and simulation, insights about the fracture process of brittle heterogeneous materials can be gained without the need for expensive, difficult, or even impossible, experiments. Brittle and heterogeneous materials like rocks usually exhibit a large spread of experimental data and there is a need for a stochastic model that can mimic this behaviour. In this work, a new numerical approach, based on the Bonded Discrete Element Method, for modelling of heterogeneous brittle materials is proposed and evaluated. The material properties are introduced into the model via two main inputs. Firstly, the grains are constructed as ellipsoidal subsets of spherical discrete elements. The sizes and shapes of these ellipsoidal subsets are randomized, which introduces a grain shape heterogeneity Secondly, the micromechanical parameters of the constituent particles of the grains are given by the Weibull distribution. The model was applied to the Brazilian Disc Test, where the crack initiation, propagation, coalescence and branching could be investigated for different sets of grain cement strengths and sample heterogeneities. The crack initiation and propagation was found to be highly dependent on the level of heterogeneity and cement strength. Specifically, the amount of cracks initiating from the loading contact was found to be more prevalent for cases with higher cement strength and lower heterogeneity, while a more severe zigzag shaped crack pattern was found for the cases with lower cement strength and higher heterogeneity. Generally, the proposed model was found to be able to capture typical phenomena associated with brittle heterogeneous materials, e.g. the unpredictability of the strength in tension and crack properties.

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Untitled

Cited by 55 publications

References 45 publications

A Lagrangian framework for analyzing microstructural level response of polymer-bonded explosives

A Lagrangian framework for analyzing microstructural level response of polymer-bonded explosives

Extensive overview of soil constitutive relations and applications for geotechnical engineering problems

A statistical DEM approach for modelling heterogeneous brittle materials

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