Hybrid carbon nanotube - carbon fiber composites for high damping

Kim, Jeffrey; Brown, Avery D.; Bakis, Charles E.; Smith, Edward C.

doi:10.1016/j.compscitech.2021.108712

Cited by 18 publications

(20 citation statements)

References 42 publications

(48 reference statements)

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“…However, CNT@X along with GNP particles demonstrated better suspension stability with a smaller supernatant volume. As symbolically depicted in Figure 1 b of a single Triton™ X-100 molecule and its structural formula, the hydrophobic octyl group at the Triton™ X-100 molecule was able to interact with CNTs through physical adsorption, while the hydrophilic segment interacted with the epoxy matrix through hydrogen bonding [ 32 , 33 ]. In other words, CNT@X could introduce steric repelling forces to construct a framework between epoxy and GNPs, which contributed to improving the dispersion effects of nanoparticles within the epoxy matrix.…”

Section: Experimental and Characterization Detailsmentioning

confidence: 99%

Improved Dynamic Compressive and Electro-Thermal Properties of Hybrid Nanocomposite Visa Physical Modification

Zhang¹,

Tang

Guo

et al. 2022

Nanomaterials

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The current work studied the physical modification effects of non-covalent surfactant on the carbon-particle-filled nanocomposite. The selected surfactant named Triton™ X-100 was able to introduce the steric repelling force between the epoxy matrix and carbon fillers with the help of beneficial functional groups, improving their dispersibility and while maintaining the intrinsic conductivity of carbon particles. Subsequent results further demonstrated that the physically modified carbon nanotubes, together with graphene nanoplates, constructed an effective particulate network within the epoxy matrix, which simultaneously provided mechanical reinforcement and conductive improvement to the hybrid nanocomposite system. For example, the hybrid nanocomposite showed maximum enhancements of ~75.1% and ~82.5% for the quasi-static mode-I critical-stress-intensity factor and dynamic compressive strength, respectively, as compared to the neat epoxy counterpart. Additionally, the fine dispersion of modified fillers as a double-edged sword adversely influenced the electrical conductivity of the hybrid nanocomposite because of the decreased contact probability among particles. Even so, by adjusting the modified filler ratio, the conductivity of the hybrid nanocomposite went up to the maximum level of ~10−1–100 S/cm, endowing itself with excellent electro-thermal behavior.

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Section: Experimental and Characterization Detailsmentioning

confidence: 99%

Improved Dynamic Compressive and Electro-Thermal Properties of Hybrid Nanocomposite Visa Physical Modification

Zhang¹,

Tang

Guo

et al. 2022

Nanomaterials

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“…On the other hand, according to the relations between the local and global derivatives in (13), the Laplacian operator Δ can be obtained in the local coordinates system as ) , (36) which, using some simple algebra, reads…”

Section: Differential Operatorsmentioning

confidence: 99%

“…Owing to their superior energy absorption capacity and lightweight but stiff structure, they have found increasing applications in many industries, such as automobile, biomedical, transportation, and energy 33 . Honeycomb structures with shape recovery, 34 energy‐absorbing Gyroid lattices, 35 high damping polymers, 36 and sound‐absorbing porous metamaterials 37 are some examples of solids that show size‐dependent dynamic response due to their periodic microstructure.…”

Section: Introductionmentioning

confidence: 99%

The scaled boundary finite element method for dispersive wave propagation in higher‐order continua

Daneshyar

Sotoudeh

Ghaemian

2022

Numerical Meth Engineering

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The classical theory of elasticity relies on the perfect structure of matter. No matter how small a medium is, it always stays homogeneous-but the reality is different. Even though the classical continuum mechanics suffices well for describing phenomena that evolve at super-microscopic scales, it ceases to reproduce reasonable responses when the size effects are pronounced. It is due to the local constitutive equations of classical continuum mechanics, which are devoid of any length scales associated with the underlying microstructure.The gradient-dependent theory of elasticity redresses this shortcoming by incorporating the kinematic quantities of the corresponding representative volume element by enriching the differential equations with higher-order spatial and temporal derivatives. In this study, the scaled boundary finite element method is formulated for the equations of motion with higher-order inertia terms. To this end, the semi-discretized scaled boundary finite element equations of the medium are derived by introducing the scaled boundary transformation of geometry to the gradient-enriched equations of motion and applying the Galerkin method of weighted residuals. It is shown that the well-established available solution methods are incapable of handling the frequency-domain representation of the derived formulation. Accordingly, a numerical solution method based on the shooting technique is proposed. The solution procedure is formulated for general numerical integration schemes via the infinite Taylor series. The evolution of the impedance-diffusion matrix and contribution of inter-subdomain forces and tractions are extracted. Four different numerical integration methods are employed to describe the solution procedure. In addition, a comparison regarding their computational efficiency is presented. For the sake of verification, the scaled boundary finite element solutions of three numerical examples are compared with reference solutions that are obtained using finite element models with extremely fine meshes. The convergence trends are also presented for both h-and p-refinement methods. The results demonstrate the capability of the proposed formulation in reproducing accurate responses.

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“…carbon/epoxy–glass/epoxy hybrids). Hybridization has been shown to be advantageous in many applications, including pseudo-ductile 18 and high damping 19 laminates, shape-memory alloy composites, 20 laminates with built-in overload sensors 21 or adaptive multistable structures with advanced mechanical performance. 22 The advanced behaviour of the hybrid laminate results from the complex effects of combining plies with different mechanical, thermal, etc.…”

Section: Introductionmentioning

confidence: 99%

Improving the extension–twist coupling performance of practically warpage-free laminates via layup hybridization

Vermes

Czigány

2022

Journal of Reinforced Plastics and Composites

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This article investigates whether the extension–twist and bend–twist coupling performance of practically warpage-free laminates can be improved by layup hybridization (carbon/epoxy–glass/epoxy hybrids) compared to non-hybrid (mono) laminates. We performed numerical layup search by simulating the thermal warpage, and the bend–twist and extension–twist behaviour of 4096 4-ply layup permutations. The upper limit of allowable manufacturing-induced warpage was based on the ISO2768 standard. The optimal hybrid and mono layups were selected to have the most significant coupling performance within the allowable warpage range. A mono layup achieved the maximum bend–twist performance (which does not require layup asymmetry), but layup hybridization increased the extension–twist performance by more than 30% in the practically warpage-free range. The numerical results were validated through 3D scanning and 3D digital image correlation–aided mechanical tests. We concluded that layup hybridization can significantly improve the extension–twist performance of realistically usable composite laminates with negligible thermal warpage.

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Hybrid carbon nanotube - carbon fiber composites for high damping

Cited by 18 publications

References 42 publications

Improved Dynamic Compressive and Electro-Thermal Properties of Hybrid Nanocomposite Visa Physical Modification

Improved Dynamic Compressive and Electro-Thermal Properties of Hybrid Nanocomposite Visa Physical Modification

The scaled boundary finite element method for dispersive wave propagation in higher‐order continua

Improving the extension–twist coupling performance of practically warpage-free laminates via layup hybridization

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