Thermal Decomposition and Fire Behavior of Carbon Fiber/Nomex Honeycomb Composite

Papadogianni, Vasiliki; Romeos, Alexandros; Perrakis, Konstantinos

doi:10.15866/ireme.v15i1.20207

Cited by 2 publications

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“…Thermal and flammability properties of the tested material, including thermal inertia kρc and ignition temperature T ig , were deduced from cone calorimeter measurements according to ISO 5660 and calculations based on the correlation of ignition data, as described in [34][35][36][37]. These properties, estimated using the analytical procedure presented in [38,39], are shown in Table 1. Triple experiments were conducted in the CFA apparatus with a horizontal orientation using radiant heat fluxes of 25, 28, 30, 32, and 35 kW/m 2 for preheating times of 30 and 180 s. Flame spread on the backside of the sample (the side facing the overhead area of the aircraft) was investigated in a facing-up configuration, and flame propagation was monitored with a video camera.…”

Section: Methodsmentioning

confidence: 99%

Fire Ignition and Propagation in Hidden Zones of Aircrafts: A Novel Confined Fire Apparatus (CFA) for Flame Spreading Investigation

Papadogianni,

Romeos,

Giannadakis

et al. 2023

Fire

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This research investigated potential fire hazards originating in hidden areas of pressurized sections of aircrafts. The objective was to establish a laboratory-scale flammability test method to predict the behavior of fire propagation under real fire conditions. A confined fire apparatus (CFA) was designed and constructed, and several tests were conducted to better understand the involved mechanisms and their consequences and to estimate flame spreading in hidden-zone fires. The experimental facility and flame-spreading results obtained for a typical material involved in hidden fires, specifically a ceiling panel, were presented and discussed. The experimental facility consisted of a narrow passage where a fire was initiated using a burner on a specimen exposed to a controlled heat flux. Experiments were conducted in the absence of forced airflow. Flame spreading was estimated through visual monitoring of fire development or temperature measurements at specific locations in the specimen. Both methods yielded similar results. The flame spread velocity in relation to the imposed heat flux allowed for the estimation of the critical heat flux for spreading q˙sp,cr″ and for ignition q˙ig,cr″; the corresponding temperatures, Ts,min and Tig; and the flame spread parameter Φ.

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Section: Methodsmentioning

confidence: 99%

Fire Ignition and Propagation in Hidden Zones of Aircrafts: A Novel Confined Fire Apparatus (CFA) for Flame Spreading Investigation

Papadogianni,

Romeos,

Giannadakis

et al. 2023

Fire

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Fire behaviour of a Carbon/Nomex honeycomb sandwich composite used in aircraft interiors as ceiling panel

2022

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Fire behaviour of a carbon/Nomex honeycomb composite, used as ceiling panel in aircraft cabins, has been investigated experimentally. The thermal decomposition that was examined in a thermogravimetric analyser (TGA), under inert atmosphere, at several heating rates (5,10 and 20 °C/min), revealed a complex degradation process with overlapping stages. Cone Calorimeter tests at different incident heat fluxes, ranging from 20 to 70 kW/m2 have also been performed. The material exhibited good fire performance with relatively low amount of heat release and long ignition times. Ignition did not occur at 20 and 30 kW/m2. Combustion of the material at 40 kW/m2 proceeded in one stage, while at higher heat fluxes two stages were observed. The burning mechanisms and structural changes during thermal decomposition at different heat fluxes were also examined. The long tail after flameout in heat release curves and the significant increase in CO production and mass loss were analysed with respect to smouldering combustion of the material core. Measurements of the surface temperature prior to ignition were in agreement with the degradation processes observed in the TGA, and were also employed for the determination of ignition temperature (Tig = 593 °C). A modified iterative method, based on the correlation of the ignition data with the imposed heat flux, was adopted for the determination of the ignition parameters, including critical heat flux and temperature for ignition, providing results in agreement with experimental observations.

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Thermal Decomposition and Fire Behavior of Carbon Fiber/Nomex Honeycomb Composite

Cited by 2 publications

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Fire Ignition and Propagation in Hidden Zones of Aircrafts: A Novel Confined Fire Apparatus (CFA) for Flame Spreading Investigation

Fire Ignition and Propagation in Hidden Zones of Aircrafts: A Novel Confined Fire Apparatus (CFA) for Flame Spreading Investigation

Fire behaviour of a Carbon/Nomex honeycomb sandwich composite used in aircraft interiors as ceiling panel

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