Thermal Analysis of Honeycomb Sandwich Panels as Substrate of Ablative Heat Shield

Tahmasbi, Vahid; Noori, Sahar

doi:10.2514/1.t5051

Cited by 6 publications

(3 citation statements)

References 16 publications

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“…Their high thermal conductivity makes them important for applications such as electronics that require high thermal conductivity. Therefore, honeycomb sandwich structures made of CNT-reinforced epoxy resin matrix can be used in applications that require high flexural, strength, and thermal conductivity simultaneously, such as reusable launch vehicles based on load-carrying structures [5] and ablative heat shields [6] that require high strength and thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, according to the law of mixtures as in Equation ( 6), the theoretical densities of the pure epoxy and nanocomposite samples reinforced with different wt.% CNTs, assuming that the theoretical density of the epoxy sample is 1.25 g/cm 3 and the theoretical density of CNTs is 1.6 g/cm 3 , the theoretical densities of the nanocomposite samples reinforced by 0.025, 0.05, and 0.075 wt.% CNTs are calculated to be 1.2500, 1.2501, 1.2502, and 1.2503 g/cm 3 , respectively [41]. ρ = ρ e V e + ρ n V n (6) where ρ e and ρ n denote the density of the epoxy and CNTs, respectively, and V e and V n are the weight percent of the epoxy and CNTs, respectively. The ratio of the actual density to the theoretical density for the pure epoxy and nanocomposite samples reinforced with 0.025, 0.05, and 0.075 wt.% CNTs are 0.9240, 0.9255, 0.9270, and 0.9278, respectively.…”

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Effects of Carbon Nanotubes on Thermal Behavior of Epoxy Resin Composites

Najmi,

2023

J. Compos. Sci.

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Human society’s need to build low-weight, high-strength and durable structures has increased the demand for composite materials. In this case, composites are used where high mechanical strength, low weight, sound and thermal insulation properties are required. One of the most important issues now is designing materials and coatings aimed at reducing heat loss and resisting high temperatures. One way to address this problem is to develop a technique for preparing and applying composite materials that slow down their heating applied to a surface. In this study, carbon nanotubes (CNTs) reinforced composites were fabricated using silicone molding to be applied to honeycomb sandwich structures. To determine the effect of CNTs on the thermal behavior of the sandwich panels, different weight percentages of this material (0.025, 0.05. 0.075 wt.%) were added to the epoxy resin. The results showed that the thermal stability of the epoxy composites was directly related to the increase in the percentage of CNTs as the CNT content increased to 0.075 wt.%, and the thermal degradation temperature of the epoxy composites increased by 14 °C. In addition, the energy absorption increased by 4.6% with an increase in CNTs up to 0.075 wt.%. Density measurements showed that the density of the nanocomposite samples increased by adding CNTs to pure epoxy resin. The actual densities of the samples reinforced with 0.025, 0.05, and 0.075 wt.% CNTs are 0.925, 0.926, and 0.927 of the theoretical density, respectively. Since the CNT dispersion uniformity in the epoxy matrix can significantly affect the properties of the composites, in this study, a new method of dispersing CNTs in the epoxy resin matrix resulted in higher thermal conductivity while using lower amounts of CNTs compared to other studies. The storage modulus of the epoxy matrix composites reinforced with 0.05 wt.% in this study was 25.9% and 6.9% higher than that from the previous study reinforced with 0.1 wt.% and 0.25 wt.% CNTs, respectively. Furthermore, the tanδ and loss modulus of the composite reinforced with 0.05 wt.% CNTs in this study were 52% and 54.5% higher than that from the previous study with 0.1 wt.% CNTs, respectively. This study provided an optimal approach for designers and engineers who want to effectively design their composite honeycomb sandwich structure with better thermal properties.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Effects of Carbon Nanotubes on Thermal Behavior of Epoxy Resin Composites

Najmi,

2023

J. Compos. Sci.

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“…From our research point of view, the task involves to the possibility of robot design imperfections occurrence, since it will be TRL2, in the research laboratory; the lack of specialized utilities at the level of the laboratory for mechanical processing of high temperatures resistant; establishing the geometrical shape of the protection system so that, from the thermodynamic point of view, refraction and reflexion coefficients corresponding to reducing the thermal energy of the robot can be obtained [57][58][59][60]; establishing a numerical-analytical model for calculating the thermal transfer processes…”

Section: Introductionmentioning

confidence: 99%

Aspects Regarding of a UGV Fire Fighting Thermal Shield

Grigore

Stefan

Oncioiu

et al. 2021

The 8th International Symposium on Sensor Science

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This article presents aspects related to the protection (with a double shield made of stainless steel) of a robot for emergency situations against the effect of flames due to a fire. The ground robot is semi-autonomous/autonomous, with a wheeled propeller (6 × 6). The robot, designed and built at the TRL 2 level, is intended for fire investigation, monitoring, and intervention (and, in particular, for petrochemical plants). The role of the shield is to protect the equipment that is part of the robot including its controllers, sensors, communications, power supply, etc. The need to mount a thermal protection shield on the intervention robot was given by the fact that fires at petrochemical plants generate very large thermal fields and gradients which are responsible for creating blind spots. These blind spots do not allow intervention crews to see what is happening in that area. These blind spots are characterized by very high temperatures. The dynamics of these fires can be unpredictable. Therefore, to analyze the performance of the heat shield in this study we perform a numerical-experimental analysis.

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Inverse identification of temperature-dependent thermal conductivity coefficients in an orthotropic charring composite

Tahmasbi

Noori

2021

Applied Thermal Engineering

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Thermal Analysis of Honeycomb Sandwich Panels as Substrate of Ablative Heat Shield

Cited by 6 publications

References 16 publications

Effects of Carbon Nanotubes on Thermal Behavior of Epoxy Resin Composites

Effects of Carbon Nanotubes on Thermal Behavior of Epoxy Resin Composites

Aspects Regarding of a UGV Fire Fighting Thermal Shield

Inverse identification of temperature-dependent thermal conductivity coefficients in an orthotropic charring composite

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