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Materials 2015, 8(11), 7524-7535; doi:10.3390/ma8115407

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
Received: 18 September 2015 / Accepted: 30 October 2015 / Published: 11 November 2015
(This article belongs to the Special Issue Failure Analysis in Materials)
View Full-Text   |   Download PDF [5563 KB, uploaded 11 November 2015]   |  

Abstract

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. View Full-Text
Keywords: fatigue damage; composites materials; CFRP; non-destructive test; non-contact inspection; optical inspection; spectrum fatigue loads; irregularity factor fatigue damage; composites materials; CFRP; non-destructive test; non-contact inspection; optical inspection; spectrum fatigue loads; irregularity factor
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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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.

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