Accession Number : ADA130707

Title :   Thermophysical Property Determinations Using Transient Techniques.

Descriptive Note : Annual rept. 15 Feb 82-15 Feb 83,


Personal Author(s) : Taylor,R E ; Shoemaker,R L ; Koshigoe,L G

PDF Url : ADA130707

Report Date : 14 Apr 1983

Pagination or Media Count : 10

Abstract : In this program, determinations of the thermophysical properties of HMX, RDX and AP are being made. Two thermal properties are being measured: (1) specific heat and (2) thermal diffusivity. The product of these results and the densities of the propellants, yields the thermal conductivity of the material. Specific heat as a function of temperature for single crystals of HMX in both their beta and delta phases have been completed. Delta phase results were obtained using two techniques: (1) short range results from 477-486 degrees K just after the phase transition (beta to delta), and (2) extended range results from 415-485 degrees K. The second technique was possible due to hysteresis in the conversion of delta-HMX back to beta-hmx following cooling from above the phase transition temperature. The delta phase results for a powdered blend of HMX were obtained and yielded good agreement of the single crystals. Also, the specific heat of HMX inter-mixed with decomposition products was found to be slightly larger than for pure HMX.

Descriptors :   *Thermophysical properties, *Transients, *Methodology, Single crystals, Specific heat, RDX, HMX, Ammonium perchlorate, Thermal conductivity, Thermal diffusion, Solid propellants

Subject Categories : Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE