Advanced thermal imaging of composites Page: 1 of 11
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ADVANCED THERMAL IMAGING OF COMPOSITES
H. Wang and R. B. Dinwiddie
Oak Ridge National Laboratory
MS 6064, Building 4515
Oak Ridge, TN 37831-6064
ABSTRACT
Composite materials were studied by Scanning Thermal Conductivity Microscope
(STCM) and high speed thermography. The STCM is a qualitative technique which
is used to study thermal conductivity variations on a sub-micrometer scale. High
speed thermography is a quantitative technique for measuring thermal diffusivity
with a variable spatial resolution from centimeters down to less than 25 jm. A
relative thermal conductivity contrast map was obtained from a SiC/SiN4
continuous fiber ceramic composite using the STCM. Temperature changes of a
carbon/carbon composite after a heat pulse were captured by an IR camera to
generate a thermal diffusivity map of the specimen. Line profiles of the temperature
distribution showed significant variations as a result of fiber orientation.
INTRODUCTION
Thermal transport properties of composite materials are very important to the
performance of practical components, especially at high temperatures. The
combination of high and low conductivity materials provides an opportunity to
control thermal properties of the resulting composite[1]. For uniaxial composites,
predictions of thermal properties from the rule-of-mixture[2] are often used.
However, microstructure of the composite and processing conditions also play
important roles in affecting the thermal transport properties. For example, the effect
of the fiber/matrix interface was studied by Hasselman[3-4]. Fiber volume
concentration as well as interface heat conduction coefficient were used to calculate
the thermal conductivity of uniaxial composites. Traditional thermal transport
measurements, such as flash diffusivity and steady state measurements, are
performed on bulk specimens which yield the effective, average thermal properties.
For composites, effective thermal properties measured by these two techniques
have been used to evaluate the materials[1-4]. These measurements only provide
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Wang, H. & Dinwiddie, R. B. Advanced thermal imaging of composites, article, June 1, 1996; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc672136/m1/1/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.