Surface irregularity factor as a parameter to evaluate the fatigue damage state of CFRP



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Zuluaga Ramírez, Pablo and Frövel, Malte and Belenguer Dávila, Tomás and Salazar, Felix (2015) Surface irregularity factor as a parameter to evaluate the fatigue damage state of CFRP. Materials, 8 (11). pp. 7524-7535. ISSN 1996-1944

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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.

Item Type:Article
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Received: 18 September 2015 / Accepted: 30 October 2015 / Published: 11 November 2015
Este artículo pertenece al Número Especial: "Failure analysis in materials".

Uncontrolled Keywords:fatigue damage; composites materials; CFRP; non-destructive test; non-contact inspection; optical inspection; spectrum fatigue loads; irregularity factor
Subjects:Sciences > Physics > Aeronautics
Sciences > Physics > Materials
ID Code:40649
Deposited On:10 Jan 2017 09:30
Last Modified:11 Jan 2017 11:21

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