Accession Number : AD0687708

Title :   CALCULATION OF TEMPERATURE HISTORIES IN ABLATING MATERIALS,

Corporate Author : NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s) : Hartmann,Bruce

Report Date : 21 AUG 1968

Pagination or Media Count : 48

Abstract : An analysis of the temperature distribution in an ablating material was made and programed for a digital computer. The basic experimental information needed for the computer program is the effective thermal diffusivity and ablation rate of the material. Parametric studies with the program show that the temperature profile is not sensitive to the temperature variation of the effective thermal diffusivity, but it is sensitive to the time variation of the ablation rate. Experimental verification of the analysis was carried out using an oxy-acetylene burner. It was found that the calculated time to reach 200C agreed with the experimental time to within 7%, provided steady-state ablation was reached. If steady-state was not reached, there was a very large error. The overall conclusions from this work are that the combination of the analysis, the computer programing, and the experimental procedures are sufficiently accurate under the test conditions used to serve as a guide in the design and selection of materials for ablation applications. (Author)

Descriptors :   (*COMPOSITE MATERIALS, *ABLATION), NYLON, PHENOLIC PLASTICS, EPOXY RESINS, GLASS TEXTILES, ASBESTOS, SILICATES, SYNTHETIC RUBBER, HIGH TEMPERATURE, ONE DIMENSIONAL FLOW, HEAT FLUX, THERMAL CONDUCTIVITY, COMPUTER PROGRAMS, STYRENE PLASTICS, BUTADIENES

Subject Categories : Miscellaneous Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE