Accession Number : AD0259648

Title :   Internally Ablating Composites.

Corporate Author : CORNELL AERONAUTICAL LAB INC BUFFALO N Y

Report Date : 30 APR 1961

Pagination or Media Count : 1

Abstract : An analysis was made of composite materials so designed that high heat flux at one face will cause one phase to act as an energy absorbing material by melting, vaporizing, or decomposing and thereby flowing out through the heated surface and in so doing cool the other phase and maintain its dimensional stability. This combined process is referred to as internal ablation. Results of numerical analysis were generalized and expressed by dimensionless groups whose relations are shown in chart form. The initially considered case of 1-dimensional heat flow into a semi-infinite body was followed by a similar treatment for the finite body. The curves prepared allow a computation of the duration of the 2-phase body for many combinations of material and environmental characteristics. In an illustrative calculation, the duration of the 2-phase body is several times greater than that of the non-porous matrix. (Author)

Descriptors :   *ABLATION, *ROCKET NOZZLES, *SWEAT COOLING, COOLING, COPPER, ETHYLENES, FLUORIDES, HEAT RESISTANT PLASTICS, HEAT TRANSFER, HIGH TEMPERATURE, MATERIALS, MATHEMATICAL ANALYSIS, MELTING, PLASTICS, POLYMERS, ROCKET ENGINES, SOLIDS, STEEL, THEORY, VAPORIZATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE