Surface Irregularity Factor as a Parameter to Evaluate the Fatigue Damage State of CFRP
1
Instituto Nacional de Técnica Aeroespacial (INTA), Carretera de Ajalvir Km 4, Torrejón de Ardoz 28850, Spain
2
Department of Applied Physics, Escuela Técnica Superior de Ingenieros de Minas y Energía, Universidad Politécnica de Madrid, C/ Ríos Rosas 21, Madrid 28003, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Robert Lancaster
Materials 2015, 8(11), 7524-7535; https://doi.org/10.3390/ma8115407
Received: 18 September 2015
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Accepted: 30 October 2015
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Published: 11 November 2015
(This article belongs to the Special Issue Failure Analysis in Materials)
This work presents an optical non-contact technique to evaluate the fatigue damage state of CFRP structures measuring the irregularity factor of the surface. This factor includes information about surface topology and can be measured easily on field, by techniques such as optical perfilometers. The surface irregularity factor has been correlated with stiffness degradation, which is a well-accepted parameter for the evaluation of the fatigue damage state of composite materials. Constant amplitude fatigue loads (CAL) and realistic variable amplitude loads (VAL), representative of real in- flight conditions, have been applied to “dog bone” shaped tensile specimens. It has been shown that the measurement of the surface irregularity parameters can be applied to evaluate the damage state of a structure, and that it is independent of the type of fatigue load that has caused the damage. As a result, this measurement technique is applicable for a wide range of inspections of composite material structures, from pressurized tanks with constant amplitude loads, to variable amplitude loaded aeronautical structures such as wings and empennages, up to automotive and other industrial applications.
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Keywords:
fatigue damage; composites materials; CFRP; non-destructive test; non-contact inspection; optical inspection; spectrum fatigue loads; irregularity factor
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MDPI and ACS Style
Zuluaga-Ramírez, P.; Frövel, M.; Belenguer, T.; Salazar, F. Surface Irregularity Factor as a Parameter to Evaluate the Fatigue Damage State of CFRP. Materials 2015, 8, 7524-7535. https://doi.org/10.3390/ma8115407
AMA Style
Zuluaga-Ramírez P, Frövel M, Belenguer T, Salazar F. Surface Irregularity Factor as a Parameter to Evaluate the Fatigue Damage State of CFRP. Materials. 2015; 8(11):7524-7535. https://doi.org/10.3390/ma8115407
Chicago/Turabian StyleZuluaga-Ramírez, Pablo, Malte Frövel, Tomás Belenguer, and Félix Salazar. 2015. "Surface Irregularity Factor as a Parameter to Evaluate the Fatigue Damage State of CFRP" Materials 8, no. 11: 7524-7535. https://doi.org/10.3390/ma8115407
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