Finite element simulation and analysis of the dielectric properties of unidirectional aramid/epoxy composites

Xu, Xiangyu; Zhang, Boming; Liu, Kai; Liu, Dawei; Bai, Ming; Li, Yun

doi:10.1002/pc.24586

Cited by 10 publications

(8 citation statements)

References 27 publications

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“…The dielectric constant and the value of E b of each component are the main concerns that significantly influence the composite voltage-withstanding performance. Because of the different dielectric constant between AMFs (>3) and ANFs (2.3–3), − the electric field distortion would appear at the interfaces under the high voltage, decreasing the value of E b . This issue is extremely dramatic and dominates the breakdown process in the samples with a low AMF doping ratio.…”

Section: Resultsmentioning

confidence: 99%

Self-Reinforced Doping Strategy in the Multiscale PMIA Paper for High Mechanical Properties and Insulating Performance

Sun,

Lv,

Zhang

et al. 2023

ACS Appl. Mater. Interfaces

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The poly(m-phenylene isophthalamide) (PMIA) paper has attracted extensive interests due to its ultrahigh mechanical properties as an ideal protective material for anti-impact damage applications. In the pursuit of additional properties, composites based on the PMIA matrix and various fillers are widely explored. However, additional improvements are frequently obtained at the expense of mechanical properties because of the serious interfacial compatibility brought by different components. In this study, a self-reinforced doping strategy is proposed by combining microscale PMIA fibers as the fillers and nanoscale PMIA fibers as the matrix to form a micronano paper. Without the limitation of the interfacial compatibility issues, the nanofibers are tightly aligned and adhered to the microfibers, enabling the in situ generation of hydrogen bonds at the interfaces. A compact interfacial structure is thus constructed with reduced porosity on the surface. It indicates that the microfibers have a positive impact on the improvement of mechanical properties. In our optimized sample with 5 wt % microfibers, the elastic modulus, tensile strength, and elongation are 1530 MPa, 24.8 MPa, and 5.3%, respectively, which are 142, 49.4, and 65% higher than those of the pristine nano-PMIA paper. In addition, the insulating performance is also improved, facilitating its further application extended to broad fields.

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Section: Resultsmentioning

confidence: 99%

Self-Reinforced Doping Strategy in the Multiscale PMIA Paper for High Mechanical Properties and Insulating Performance

Sun,

Lv,

Zhang

et al. 2023

ACS Appl. Mater. Interfaces

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“…Researches on the advanced wave‐transparent materials have never stopped due to their tremendously important role in cutting‐edge industries such as aerospace, wireless communications and Internet of things. [ 1,2 ] As far as wave transmission is concerned, excellent dielectric properties of materials are indisputably essential, which generally refer to a low dielectric constant and dielectric loss value. [ 3,4 ] Besides, with the upgrading of radar antenna system and complex service environment, promising wave transmitting materials also need to possess the advantages of lightweight, high temperature and ablative resistance, and excellent mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…The results display that the gain of the microstrip antenna is 6.2 dB, which is superior to those of many other reported microstrip antennas, indicating that the 3DKPC proposed here has great application potential in aerospace, wireless communication, and other fields.Researches on the advanced wave-transparent materials have never stopped due to their tremendously important role in cutting-edge industries such as aerospace, wireless communications and Internet of things. [1,2] As far as wave transmission is concerned, excellent dielectric properties of materials are indisputably essential, which generally refer to a low dielectric constant and dielectric loss value. [3,4] Besides, with the upgrading of radar antenna system and complex service environment, promising wave transmitting materials also need to possess the…”

mentioning

confidence: 99%

Ultra‐lightweight 3D woven spacer integrated composites with stabilization of dielectric and robust mechanical properties at room and elevated temperatures

Zheng

Zhang

et al. 2022

Polymer Composites

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Polymer matrix composites with lightweight, low dielectric constant (ε) and dielectric loss tangent (tan δ), high‐temperature resistance, and excellent mechanical properties are urgently needed in the fields of aviation, aerospace, transportation, and wireless communication services. In this work, 3D woven spacer Kevlar/polyimide composites (3DKPC) with excellent dielectric properties and robust mechanical properties were designed and obtained by combining 3D weaving technology and thermal imidization process. Results show that the volume density of the prepared composites is as low as 0.24 g·cm−3, but its compressive strength can be up to 6.24 MPa. The dielectric constant and loss tangent of 3DKPC at room temperature are extremely low, with the value of ~1.32 and 6.9 × 10−3, respectively. Moreover, the compressive strength retention rate is more than 96% and the dielectric constant can be consistently lower than 1.36 when the temperature increases from 25 to 300°C, demonstrating the outstanding mechanical and dielectric stability of 3DKPC. In addition, as an application example of resulting composites, a microstrip antenna with 3DKPC as the substrate material was designed, followed by the simulation of its electromagnetic properties via High Frequency Structural Simulator. The results display that the gain of the microstrip antenna is 6.2 dB, which is superior to those of many other reported microstrip antennas, indicating that the 3DKPC proposed here has great application potential in aerospace, wireless communication, and other fields.

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“…Among classical continuum approaches, the finite element method (FEM) and the finite difference method have been previously considered for describing the polarization response of mixed materials. Previous works have provided significant insight into the dielectric behavior of mixtures including elongated and irregularly-shaped microscale inclusions, [25,26,27] three-phase mixtures, [26] and random distributions of inclusions. [28,29] These models often include an explicit interfacial layer, to account for the effects mentioned above.…”

Section: Introductionmentioning

confidence: 99%

“…[28,29] These models often include an explicit interfacial layer, to account for the effects mentioned above. [26,27] The results of these numerical calculations have prompted modifications to effective medium models, and helped elucidate the conditions under which those models lose their validity.…”

Section: Introductionmentioning

confidence: 99%

Dielectric metal/metal oxide nanocomposites: modeling response properties at multiple scales

Henderson

Adluri

Paci

2022

Preprint

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Nanocomposites with metallic inclusions show great promise as tunable functional materials, particularly for applications where high permittivities are desirable, such as charge-storage. These applications strain quantum mechanical computational approaches, as any representative sample of the material includes hundreds if not thousands of atoms. Many continuum methods offer some predictive power for matrix-inclusion composites, but cannot be directly applied to composites with small inclusions, for which quantum and interfacial effects dominate. Here, we develop an adjustable finite element approach to calculate the permittivities of composites consisting of a metal-oxide matrix with nanometer-scale silver inclusions, by introducing an interfacial layer in the model. The approach involves solving the Laplace equation with Dirichlet and Neumann boundary conditions. We demonstrate that such a continuum model, when appropriately informed using quantum mechanical results, can capture many of the relevant polarization effects in a metal/metal oxide nanocomposite, including those that contain arbitrarily-small inclusions, at a fraction of the computational cost of performing the full quantum mechanics

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Finite element simulation and analysis of the dielectric properties of unidirectional aramid/epoxy composites

Cited by 10 publications

References 27 publications

Self-Reinforced Doping Strategy in the Multiscale PMIA Paper for High Mechanical Properties and Insulating Performance

Self-Reinforced Doping Strategy in the Multiscale PMIA Paper for High Mechanical Properties and Insulating Performance

Ultra‐lightweight 3D woven spacer integrated composites with stabilization of dielectric and robust mechanical properties at room and elevated temperatures

Dielectric metal/metal oxide nanocomposites: modeling response properties at multiple scales

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