Accession Number : AD0709790

Title :   INVESTIGATION OF THE BEHAVIOR OF REINFORCED PLASTICS SUBJECTED TO LOW HEATING RATES.

Descriptive Note : Final rept.,

Corporate Author : CALIFORNIA UNIV BERKELEY

Personal Author(s) : Giedt,W. H.

Report Date : 01 MAR 1961

Pagination or Media Count : 80

Abstract : A study was made of the ablation mechanism of an asbestos filled phenolic plastic subjected to turbulent, flat plate flow of oxyacetylene combustion products which produced a convective heat rate of 20 to 40 Btu/sec sq ft. Substrate temperature distribution measurements were first analyzed to establish the existence of significant heat generation or absorption due to phenolic resin decomposition. The cooling obtained by mass transfer resulting from substrate pyrolization was then investigated. This effect together with radiation losses and sensible heat stored in the solid were computed and compared with the non-ablative heat flux established by earlier tests. By combination of the results of these separate studies a complete heat balance of the ablation process was possible. It was also shown that the depth of thermal penetration is a time dependent function of thermal diffusivity only. (Author)

Descriptors :   (*REINFORCED PLASTICS, *ABLATION), (*ASBESTOS, ABLATION), PHENOLIC PLASTICS, MASS TRANSFER, GLASS TEXTILES, LAMINATED PLASTICS

Subject Categories : Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE