.... In this work, geometry constraints of specimens for laser flash determination of thermal diffusivity are investigated. The laser flash technique depends on the assumption of one dimensional adiabatic heat conduction between two of the specimen surfaces. As test temperatures rise above 400°C, radiation heat...

... Thermal physical (thermal diffusivity and conductivity) and optical (attenuation, absorption and scattering) properties of alumina fiber insulation materials were measured. The measurements of apparent thermophysical properties are based on the method of heating of plate specimens at a constant...

... The relationship between microstructural damage and the thermal diffusivity of unidirectional reinforced Nicalon™-LAS II was investigated. Damage in the form of matrix-microcracking and fiber-matrix debonding was induced in the composites through Monotonic and cyclic mechanical loading...

... Fundamental thermal properties of various high water content materials were determined using a number of thermal testing methods. Tests were conducted on peat soils, solid wastes, industrial sludge, and bentonite slurries. Thermal conductivity, heat capacity, and thermal diffusivity were...

... of the distribution of thermal diffusivity in large components. By applying digital filtering, interpolation, and least-squares-estimation techniques for noise reduction, we have achieved acquisition and analysis times of minutes or less with submillimeter spatial resolution. The system has been used to examine...

... the fundamental temperature oscillations at the surface of the specimen and at a well defined position inside the specimen enables one to determine the thermal diffusivity. Knowing the thermal diffusivity of the specimen the thermal conductivity is determined using the measured amplitude attenuation...

... upon conventional conductive heat transfer analyses can be drastically in error. In addition, it is shown that transient thermal tests on such (scattering) media do not yield proper thermal diffusivity values. heat transfer radiation thermal conductivity thermal diffusivity thermal insulation...

... was performed to determine which thermal properties affect pavement cooling times significantly. The results indicated that more information on asphalt thermal conductivity and thermal diffusivity is required. Two suitable test methods for determining these properties at typical paving temperatures...

... Various compounds of carbon-boron-titanium for improving the hydrogen-retention properties and erosion resistances of the carbon materials under the high heat load from the plasma were synthesized. Thermal diffusivity of the compounds were measured. The materials were neutron irradiated...

... The Unguarded Thin-Heater Apparatus (UTHA, ASTM C 1114) was used to determine the thermal conductivity (k), specific heat (C), and thermal diffusivity (α) of selected building materials from 24 to 50°C. Steady-state and transient measurements yielded data on four types of material: gypsum wall...

... hardness laser-induced damage nondestructive evaluation nuclear hardness optical coatings thermal conductivity thermal diffusivity thermal properties thermal transport thin films Manuscript received 1-30-90 Thermal Transport Studies of Optical Coatings, Interfaces and Surfaces by Thermal...

... We report the present status of a project to measure the thermal transport properties of optical coating materials in thin-film format. The measurement technique employs a noncontact nondestructive method based on thermal diffusion-wave interferometry. Initial results confirm the feasibility...

... Thermal diffusivities for a T300/5208 graphite/epoxy system were calculated from thermal conductivity, heat capacity, and density. These thermal diffusivity data were then used along with an infinite plate model having the fibers oriented in the direction perpendicular to the heat flow...

... thermal expansion modulus of elasticity stress-strain creep strain compressive strength Poisson's ratio split cylinder tensile strength elevated temperature thermal conductivity thermal diffusivity specific heat temperature distributions rational design simple support continuity axial...

... with the temperature both increasing and decreasing; the value of C F is then adjusted until the two sets of data produce the same value of conductivity. Since C F is a function of the density of the specimen and its specific heat at constant pressure, an approximate value of the thermal diffusivity is obtained...

... A unique method has been developed for rapidly determining, nondestructively, the localized thermal conductivity, and thermal diffusivity of graphites near room temperature. The method employs transient heating and requires access to only one surface of a solid. It involves heating a small area...