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Title: Non-Destructive Evaluation of Wind Turbine Blades Using an Infrared Camera

Abstract

The use of a digital infrared as a non-destructive evaluation thermography camera (NDE) tool was ex- plored in two separate wind turbine blade fatigue tests. The fwst test was a fatigue test of part of a 13.1 meter wood-epoxy-composite blade. The second test was on a 4.25 meter pultruded fiber glass blade section driven at several mechanical resonant frequencies. The digital infrared camera can produce images of either the static temperature distribution on the surface of the specimen, or the dynamic temperature distribution that is in phase with a specific frequency on a vibrating specimen. The dynamic temperature distribution (due to thermoplastic effects) gives a measure of the sum of the principal stresses at each point on the surface. In the wood- epoxy-composite blade fatigue test, the point of ultimate failure was detected long before failure occurred. The mode shapes obtained with the digital infrared camera, from the resonant blade tests, were in very good agree- ment with the finite-element calculations. In addition, the static temperature images of the resonating blade showed two areas that contained cracks. Close-up dy- namic inf%red images of these areas showed the crack structure that agreed with subsequent dye-penetrant analysis.

Authors:
;
Publication Date:
Research Org.:
Sandia National Laboratories, Albuquerque, NM, and Livermore, CA
Sponsoring Org.:
USDOE
OSTI Identifier:
2459
Report Number(s):
SAND98-2824C
ON: DE00002459
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: American Society of Mechanical Engineers Wind Energy Symposium; Reno, NV; 01/11/1999
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; Wind Turbines; Cameras; Turbine Blades

Citation Formats

Beattie, A.G., and Rumsey, M. Non-Destructive Evaluation of Wind Turbine Blades Using an Infrared Camera. United States: N. p., 1998. Web.
Beattie, A.G., & Rumsey, M. Non-Destructive Evaluation of Wind Turbine Blades Using an Infrared Camera. United States.
Beattie, A.G., and Rumsey, M. Thu . "Non-Destructive Evaluation of Wind Turbine Blades Using an Infrared Camera". United States. doi:. https://www.osti.gov/servlets/purl/2459.
@article{osti_2459,
title = {Non-Destructive Evaluation of Wind Turbine Blades Using an Infrared Camera},
author = {Beattie, A.G. and Rumsey, M.},
abstractNote = {The use of a digital infrared as a non-destructive evaluation thermography camera (NDE) tool was ex- plored in two separate wind turbine blade fatigue tests. The fwst test was a fatigue test of part of a 13.1 meter wood-epoxy-composite blade. The second test was on a 4.25 meter pultruded fiber glass blade section driven at several mechanical resonant frequencies. The digital infrared camera can produce images of either the static temperature distribution on the surface of the specimen, or the dynamic temperature distribution that is in phase with a specific frequency on a vibrating specimen. The dynamic temperature distribution (due to thermoplastic effects) gives a measure of the sum of the principal stresses at each point on the surface. In the wood- epoxy-composite blade fatigue test, the point of ultimate failure was detected long before failure occurred. The mode shapes obtained with the digital infrared camera, from the resonant blade tests, were in very good agree- ment with the finite-element calculations. In addition, the static temperature images of the resonating blade showed two areas that contained cracks. Close-up dy- namic inf%red images of these areas showed the crack structure that agreed with subsequent dye-penetrant analysis.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Dec 17 00:00:00 EST 1998},
month = {Thu Dec 17 00:00:00 EST 1998}
}

Conference:
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