Zhaoxu Meng
Clemson University
Sheet moulding compoundDeformation (engineering)Composite materialRepresentative elementary volumeEpoxyNanotechnologyCompression (physics)Materials scienceModulusCarbon fiber reinforced polymerBallistic impactGrapheneMicromechanicsElastic modulusProjectileFiberPolymerFracture mechanicsMolecular dynamicsDelaminationMicrostructureNanocomposite
30Publications
13H-index
505Citations
Publications 30
Newest
#1Zhaoxu Meng (NU: Northwestern University)H-Index: 13
#2Jialun Han (NU: Northwestern University)H-Index: 1
Last. Sinan Keten (NU: Northwestern University)H-Index: 34
view all 6 authors...
Abstract Ballistic performance of ultra-thin graphene membranes have recently been investigated at the micro and nanoscale. Two open questions that remain unanswered are, how graphitic plates behave when they can no longer be treated as a thin membrane, and how the projectile shape influences the perforation resistance of plates of varying thicknesses. Through coarse-grained molecular dynamics simulations, we show that beyond a critical plate thickness, a cylindrical projectile penetrates the pl...
15 CitationsSource
Source
#1Zhaoxu Meng (NU: Northwestern University)H-Index: 13
#2Amit Kumar Singh (NU: Northwestern University)H-Index: 7
Last. Sinan Keten (NU: Northwestern University)H-Index: 34
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Abstract Recent microscale ballistic experiments have revealed that multilayer graphene membranes exhibit exceptionally high ballistic limit velocity and specific penetration energy. A key feature contributing to the exceptional performance of these systems is the cone wave that develops at impact, which propagates radially at a very high speed for ultra-light and stiff graphene membranes, distributing the kinetic energy of the projectile away from the impact zone. Current theories on ballistic ...
17 CitationsSource
#1Xin Qin (NU: Northwestern University)H-Index: 7
#2Shizhe Feng (NU: Northwestern University)H-Index: 1
Last. Sinan Keten (NU: Northwestern University)H-Index: 34
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Cellulose nanopaper exhibits outstanding stiffness, strength, and toughness that originate from the exceptional properties of constituent cellulose nanocrystals (CNCs). However, it remains challenging to link the nanoscale properties of rod-like CNCs and their structural arrangements to the macroscale performance of nanopaper in a predictive manner. Here we address this need by establishing an atomistically informed coarse-grained model for CNCs via a strain energy conservation paradigm and simu...
17 CitationsSource
#1Zhaoxu Meng (NU: Northwestern University)H-Index: 13
#2Rafael A. Soler-Crespo (NU: Northwestern University)H-Index: 8
Last. Sinan Keten (NU: Northwestern University)H-Index: 34
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Abstract Graphene oxide (GO) shows promise as a nanocomposite building block due to its exceptional mechanical properties. While atomistic simulations have become central to investigating its mechanical properties, the method remains prohibitively expensive for large deformations and mesoscale failure mechanisms. To overcome this, we establish a coarse-grained (CG) model that captures key mechanical and interfacial properties, and the non-homogeneous effect of oxidation in GO sheets. The CG mode...
29 CitationsSource
#1Weidong Wang (NU: Northwestern University)H-Index: 15
#2Longlong Li (Xidian University)H-Index: 1
Last. Horacio D. Espinosa (NU: Northwestern University)H-Index: 75
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Molecular dynamics simulations on nanoindentation of circular monolayer molybdenum disulfide (MoS2) film are carried out to elucidate the deformation and failure mechanisms. Typical force–deflection curves are obtained, and in-plane stiffness of MoS2 is extracted according to a continuum mechanics model. The measured in-plane stiffness of monolayer MoS2 is about 182 ± 14 N m−1, corresponding to an effective Young's modulus of 280 ± 21 GPa. More interestingly, at a critical indentation depth, the...
18 CitationsSource
#1Zhaoxu Meng (NU: Northwestern University)H-Index: 13
#2Miguel A. Bessa (NU: Northwestern University)H-Index: 15
Last. Sinan KetenH-Index: 34
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Predicting the macroscopic fracture energy of highly cross-linked glassy polymers from atomistic simulations is challenging due to the size of the process zone being large in these systems. Here, we present a scale-bridging approach that links atomistic molecular dynamics simulations to macroscopic fracture properties on the basis of a continuum fracture mechanics model for two different epoxy materials. Our approach reveals that the fracture energy of epoxy resins strongly depends on the functi...
37 CitationsSource
#1Wenjie Xia (NU: Northwestern University)H-Index: 20
#2Jake Song (NU: Northwestern University)H-Index: 8
Last. Sinan Keten (NU: Northwestern University)H-Index: 34
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Polymers reinforced with multi-layer graphene (MLG) phases are promising candidates for new materials with high modulus, strength and toughness. Drawing inspiration from nacre's layered “brick and mortar” structure, here we propose molecular scale design strategies to improve the mechanical performance of MLG–polymer layer-by-layer nanocomposites. We present a coarse-grained molecular dynamics (CG-MD) study of interfacial failure mechanisms of MLG domains embedded in a poly(methyl methacrylate) ...
20 CitationsSource
#1Xiaoding Wei (NU: Northwestern University)H-Index: 24
#2Zhaoxu Meng (NU: Northwestern University)H-Index: 13
Last. Horacio D. Espinosa (NU: Northwestern University)H-Index: 75
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Understanding the deformation mechanisms in multilayer graphene (MLG), an attractive material used in nanodevices as well as in the reinforcement of nanocomposites, is critical yet challenging due to difficulties in experimental characterization and the spatiotemporal limitations of atomistic modeling. In this study, we combine nanomechanical experiments with coarse-grained molecular dynamics (CG-MD) simulations to elucidate the mechanisms of deformation and failure of MLG sheets. Elastic proper...
56 CitationsSource
#1Luis Ruiz (NU: Northwestern University)H-Index: 9
#2Wenjie Xia (NU: Northwestern University)H-Index: 20
Last. Sinan Keten (NU: Northwestern University)H-Index: 34
view all 4 authors...
Abstract Graphene is the strongest and highest weight-to-surface ratio material known, rendering it an excellent building block for nanocomposites. Multi-layer graphene (MLG) assemblies have intriguing mechanical properties distinct from the monolayer that remain poorly understood due to spatiotemporal limitations of experimental observations and atomistic modeling. To address this issue, here we establish a coarse-grained molecular dynamics (CG-MD) model of graphene using a strain energy conser...
85 CitationsSource