Response of removable epoxy foam exposed to fire using an element death model.

Hobbs, Michael L.

Sandia National Laboratories

关键词: Combustion Kinetics Epoxy Resins.;    Foam.;    Fires;    37 Inorganic, Organic, Physical And Analytical Chemistry;    Epoxy Resins.;   

DOI  :  10.2172/919126
RP-ID  :  SAND2004-4320
RP-ID  :  AC04-94AL85000
RP-ID  :  919126

美国|英语

来源: UNT Digital Library

【 摘 要 】

Response of removable epoxy foam (REF) to high heat fluxes is described using a decomposition chemistry model [1] in conjunction with a finite element heat conduction code [2] that supports chemical kinetics and dynamic radiation enclosures. The chemistry model [1] describes the temporal transformation of virgin foam into carbonaceous residue by considering breakdown of the foam polymer structure, desorption of gases not associated with the foam polymer, mass transport of decomposition products from the reaction site to the bulk gas, and phase equilibrium. The finite element foam response model considers the spatial behavior of the foam by using measured and predicted thermophysical properties in combination with the decomposition chemistry model. Foam elements are removed from the computational domain when the condensed mass fractions of the foam elements are close to zero. Element removal, referred to as element death, creates a space within the metal confinement causing radiation to be the dominant mode of heat transfer between the surface of the remaining foam elements and the interior walls of the confining metal skin. Predictions were compared to front locations extrapolated from radiographs of foam cylinders enclosed in metal containers that were heated with quartz lamps [3,4]. The effects of the maximum temperature of the metal container, density of the foam, the foam orientation, venting of the decomposition products, pressurization of the metal container, and the presence or absence of embedded components are discussed.