Fire-Induced Response in Foam Encapsulants PDF Download
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Author:
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ISBN:
Category :
Languages : en
Pages : 16
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Book Description
The paper provides a concise overview of a coordinated experimental/theoretical/numerical program at Sandia National Laboratories to develop an experimentally validated model of fire-induced response of foam-filled engineered systems for nuclear and transportation safety applications. Integral experiments are performed to investigate the thermal response of polyurethane foam-filled systems exposed to fire-like heat fluxes. A suite of laboratory experiments is performed to characterize the decomposition chemistry of polyurethane. Mass loss and energy associated with foam decomposition and chemical structures of the virgin and decomposed foam are determined. Decomposition chemistry is modeled as the degradation of macromolecular structures by bond breaking followed by vaporization of small fragments of the macromolecule with high vapor pressures. The chemical decomposition model is validated against the laboratory data. Data from integral experiments is used to assess and validate a FEM foam thermal response model with the chemistry model developed from the decomposition experiments. Good agreement was achieved both in the progression of the decomposition front and the in-depth thermal response.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 16
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Book Description
The paper provides a concise overview of a coordinated experimental/theoretical/numerical program at Sandia National Laboratories to develop an experimentally validated model of fire-induced response of foam-filled engineered systems for nuclear and transportation safety applications. Integral experiments are performed to investigate the thermal response of polyurethane foam-filled systems exposed to fire-like heat fluxes. A suite of laboratory experiments is performed to characterize the decomposition chemistry of polyurethane. Mass loss and energy associated with foam decomposition and chemical structures of the virgin and decomposed foam are determined. Decomposition chemistry is modeled as the degradation of macromolecular structures by bond breaking followed by vaporization of small fragments of the macromolecule with high vapor pressures. The chemical decomposition model is validated against the laboratory data. Data from integral experiments is used to assess and validate a FEM foam thermal response model with the chemistry model developed from the decomposition experiments. Good agreement was achieved both in the progression of the decomposition front and the in-depth thermal response.
Author:
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ISBN:
Category :
Languages : en
Pages : 13
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Book Description
Reported is the result of an experimental investigation of fire-induced response of a 96 kg/m3 closed cell rigid polyurethane foam. The specimen is 0.37 m in diameter, and 152 mm thick, placed in a cylindrical test vessel. The fire condition is simulated by heating the bottom of the test vessel to 1283 K using a radiant heat source. Real-time x-ray shows that the degradation process involves the progression of a charring front into the virgin material. The charred region has a regular and graded structure consisting of a packed bubble outer layer and successive layers of thin shells. The layer-to-layer permeability appears to be poor. There are indications that gas vents laterally. The shell-like structure might be the result of lateral venting. Although the foam degradation process is quite complicated, the in-depth temperature responses in the uncharted foam appear to be consistent with steady state ablation. The measured temperature responses are well represented by the exponential distribution for steady state ablation. An estimate of the thermal diffusivity of the foam is obtained from the ablation model. The experiment is part of a more comprehensive program to develop material response models of foams and encapsulants.
Author: Leslie Jay Cohen
Publisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 1312
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Author: Society for the Advancement of Material and Process Engineering
Publisher: Society for the Advancement of Material & Process Engineering
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 976
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Author:
Publisher:
ISBN:
Category : Combustion
Languages : en
Pages : 820
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 682
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Book Description
Author: J. Innes
Publisher: iSmithers Rapra Publishing
ISBN: 9781859574355
Category : Science
Languages : en
Pages : 152
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Book Description
This review sets out to describe the types of flame retardants available for compounding into plastics materials, mechanisms of action and uses. This review provides a clear overview of the state-of-the-art of flame retardancy for plastics. It highlights the new developments and the potential problems with legislation, together with the benefits to end users of protection from fire hazards. This review is accompanied by around 400 abstracts from papers and books in the Rapra Polymer Library.
Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 892
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Author: Carlos Giudice
Publisher: BoD – Books on Demand
ISBN: 9535134914
Category : Technology & Engineering
Languages : en
Pages : 134
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Book Description
Materials are at the center of all technological advances; it is evident in considering the spectacular progress that has been made in fields as diverse as engineering, medicine, biology, etc. Materials science and technology must develop researches allowing the generation of new methods of protection to reduce fundamentally the losses of human life as well as the economic ones. The former are impossible of quantifying, while the latter are highly significant; thus, only those derived from corrosive processes in their different forms reach, in technologically developed countries, about 4% of the Gross National Product (GNP), while those derived from fire action range from 0.5 to 1.0% of the mentioned GNP. The book, in the different chapters, displays original systems of superficial protection and of low environmental impact to minimize the losses by corrosion and the fire action.
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 952
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Book Description
