The recent progress of functionally graded CNT reinforced composites and structures

Liew, K.M.; Pan, Ziheng; Zhang, Luwen

doi:10.1007/s11433-019-1457-2

Cited by 152 publications

(32 citation statements)

References 211 publications

(228 reference statements)

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“…The substitution of eqs. (25) and (27) into eq. 8gives the evolution equation of the plastic deformation First of all, if the uniform solution of the plastic deformation is assumed, the solution depends on the applied loading and the slip resistant load.…”

Section: Some General Characteristics Of the Plastic And Failure Behamentioning

confidence: 99%

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The intrinsic nature of materials failure and the global non-equilibrium energy criterion

Wang

2020

Sci. China Phys. Mech. Astron.

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Materials failure under some sort of loading is a well-known natural phenomenon, and the reliable prediction of materials failure is the most important key issue for many different kinds of engineering structures based on their safety considerations. In this research, instead of establishing empirical models, the material failure process was modeled as a nonequilibrium process based on the microstructural mechanism. Then, the evolution equations were established and the stability analysis was carried out to obtain the critical conditions for the materials failure. It was found that the material strength was a global property in nature, and the commonly used local criteria based on the most dangerous point failure were not the rational assumption. Based on the idea, some examples were considered, such as the size effect of the material strength, the strength of the polycrystalline metals, the stress-strain relationship of the ultrafine crystalline metal with nanoscale growth twins, the strength of lithium niobite crystal specimens with notches. All of the theoretical predictions gave reasonable results compared with the experimental data.

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Section: Some General Characteristics Of the Plastic And Failure Behamentioning

confidence: 99%

“…To satisfy the engineering demands, it is needed to develop some methodologies based on rational thermodynamics. In fact, based on the energy methodology, one can do many reasonable predictions for different problems [23][24][25][26][27][28][29][30][31].…”

Section: Some Concluding Remarksmentioning

confidence: 99%

The intrinsic nature of materials failure and the global non-equilibrium energy criterion

Wang

2020

Sci. China Phys. Mech. Astron.

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“…Exploring the physical mechanisms behind cavitation and crazing using a computational approach is at great challenges. At the nanoscale level, although molecular dynamics (MD) is considered as a workhorse tool to provide reliable atomic insights in composite systems [22][23][24], large-scale atomistic simulation is still essential at the expense of computational efficiency, in order to cover the entire length of cavitation and crazing sites ranging from nanometer to micrometer. At the macroscale level, despite the fact that continuum mechanics can clearly display the cavitation and crazing phenomenon and characterize the crack-growth behaviors [25], the disentanglement of polymer chains that significantly influence the cavitation-crazing transition cannot be captured.…”

Section: Introductionmentioning

confidence: 99%

Atomistic Insights into the Tunable Transition from Cavitation to Crazing in Diamond Nanothread-Reinforced Polymer Composites

Zhang

et al. 2020

Research

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Cavitation and crazing in thermosetting polymers can be sophisticatedly designed for valuable applications in optics, electronics, and biotechnology. It is a great challenge for numerical study to describe the formations of cavity and fibrils in polymer composite due to the complicated interfacial interaction. To explore this challenging task, we exploit a two-phase coarse-grained framework which serves as an efficient atomistic level-consistent approach to expose and predict the transition between cavitation and crazing in a polymeric system. The coarse-grained framework is utilized to transmit the information between single phase and interface in polymer composite, and the learning tasks of force field are fulfilled through parameterization of mechanical performances and structural characterizations. We elaborate on the intrinsic characteristics of the cavitation-crazing transition in diamond nanothread- (DNT-) reinforced polymethyl methacrylate composites, in which DNT plays a specific role of nanomodulator to tune the cavity volume ratio. The transition from cavitation to crazing can be induced through a novel dissipative mechanism of opening an interlocked network, in which case the DNT is stretched to the aligned fibrils and links crazing tightly by interfacial adhesion. The designed computational framework can broaden the scope of theoretical tools for providing better insights into the microstructure design of polymer composites.

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“…The common nanostructures include nanowires or nanobeams, 6 nanoplates, 7 nanospheres 8 as well as composite structures reinforced by nanomaterials. 9 Among various different mechanical properties, the dynamic characteristics of nanomaterials and nanostructures occupy a very important position. 10 As one of the focusing issues, the dynamic response is a typical feature in the operation of nano-devices that needs to be paid attention to.…”

Section: Introductionmentioning

confidence: 99%

Free Vibration of Axially Moving Functionally Graded Nanoplates Based on the Nonlocal Strain Gradient Theory

Li¹,

Wang²,

Luo³

et al. 2020

The International Journal of Acoustics and Vibration

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Using the nonlocal strain gradient theory, we explore vibration behaviours of initially bidirectional tensioned functionally graded nanoplates with axial speed. The governing equation of motion can be obtained based on the differential type of nonlocal strain gradient constitutive relation, which characters the dynamics of nanostructures containing kinematic relation. The simply supported boundary constraints on four sides are considered and subsequently the numerical results are determined. It shows that natural frequencies of axially moving nanoplates decrease when increasing the axial speed and the nonlocal parameter. Hence the nonlocal and kinematic factors cause the natural frequencies to decrease or, weaken the equivalent bending rigidity. On the other hand, natural frequencies increase with an increase in the axial tension and material characteristic scale. Hence the strain gradient and tensile stress factors cause the natural frequencies to increase or, strengthen the equivalent bending rigidity. In addition, the natural frequencies get higher with a larger aspect ratio of the functionally graded nanoplate. The larger one between the nonlocal parameter and the material characteristic scale plays a dominant role in the softening and stiffening mechanisms of the nonlocal strain gradient effect. In case of the same magnitude of the nonlocal parameter and the material characteristic scale, the softening and hardening phenomena disappear. The equivalent bending rigidity neither increases nor decreases in such a situation, and its value degenerates to the classical one.

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The recent progress of functionally graded CNT reinforced composites and structures

Cited by 152 publications

References 211 publications

The intrinsic nature of materials failure and the global non-equilibrium energy criterion

The intrinsic nature of materials failure and the global non-equilibrium energy criterion

Atomistic Insights into the Tunable Transition from Cavitation to Crazing in Diamond Nanothread-Reinforced Polymer Composites

Free Vibration of Axially Moving Functionally Graded Nanoplates Based on the Nonlocal Strain Gradient Theory

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