LATERAL HEAT FLOW INFRARED THERMOGRAPHY FOR THICKNESS INDEPENDENT DETERMINATION OF THERMAL DIFFUSIVITY IN CFRP

Journal Article · Thu Feb 28 00:00:00 EST 2008 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2902696· OSTI ID:21210237

Tralshawala, Nilesh; Howard, Don; Knight, Bryon; Plotnikov, Yuri; Ringermacher, Harry ^[1]

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1. Nondestructive Technologies Laboratory, GE--Global Research Center, Niskayuna, NY 12309 (United States)

In conventional infrared thermography, determination of thermal diffusivity requires thickness information. Recently GE has been experimenting with the use of lateral heat flow to determine thermal diffusivity without thickness information. This work builds on previous work at NASA Langley and Wayne State University but we incorporate thermal time of flight (tof) analysis rather than curve fitting to obtain quantitative information. We have developed appropriate theoretical models and a tof based data analysis framework to experimentally determine all components of thermal diffusivity from the time-temperature measurements. Initial validation was carried out using finite difference simulations. Experimental validation was done using anisotropic carbon fiber reinforced polymer (CFRP) composites. We found that in the CFRP samples used, the in-plane component of diffusivity is about eight times larger than the through-thickness component.

• OSTI ID: 21210237
• Journal Information: AIP Conference Proceedings, Vol. 975, Issue 1; Conference: 34. annual review of progress in quantitative nondestructive evaluation, Golden, CO (United States), 22-27 Jul 2007; Other Information: DOI: 10.1063/1.2902696; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
CARBON FIBERS
COMPOSITE MATERIALS
COMPUTERIZED SIMULATION
DATA ANALYSIS
FINITE DIFFERENCE METHOD
HEAT FLUX
HEAT TRANSFER
INFRARED THERMOGRAPHY
NONDESTRUCTIVE TESTING
POLYMERS
REINFORCED MATERIALS
TEMPERATURE MEASUREMENT
THERMAL DIFFUSION
THERMAL DIFFUSIVITY
THICKNESS
TIME-OF-FLIGHT METHOD
VALIDATION