Accession Number : ADA115356

Title :   Thermophysical Property Determinations Using Transient Techniques.

Descriptive Note : Annual rept. 15 Feb 81-15 Feb 82,


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

PDF Url : ADA115356

Report Date : 31 Mar 1982

Pagination or Media Count : 12

Abstract : This program has as its objectives the measurement of the thermophysical properties of energetic materials (AP, HMX, and RDX) and of carbon/carbon materials. The specific heat of ammonium perchlorate up to the beginning of decomposition has been measured with a differential scanning calorimeter. The theory for the ramp heating of a sample with a heat pulse input for determining diffusivity and the heat conduction theory for strip heating have been investigated. Software has been written to accommodate ramp heating at rates up to 30 deg.C per second using the pulse heating method for measuring diffusivity. Thermal diffusivity and specific heat measurements have been made on coarse weave carbon/carbon materials. The heat flow through both the individual fibers and the matrix material have been investigated using the flash diffusivity technique, for the purpose of verifying the applicability of the concept of diffusivity to this type of composite material. This work has indicated that an off-axis measurement procedure could be developed which uniquely defines the heat conduction in the various fiber directions for fiber composite material. (Author)

Descriptors :   *Fiber reinforced composites, *Carbon carbon composites, *Thermophysical properties, *Transients, Measurement, Energetic properties, HMX, Ammonium perchlorate, Computer programs, Diffusion, Pulses, Flashes, Scanning, Thermal conductivity, Theory, Flow, Matrix materials, Heating

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE