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Compression after impact and fatigue behavior of CFRP stiffened panels

Roman Ružek (Department of Strength of Structures, aVýzkumný a zkušební letecký ústav, a.s. (VZLÚ), Prague, Czech Republic.)
Konstantinos Tserpes (Department of Mechanical Engineering & Aeronautics, University of Patras, Patras, Greece.)
Evaggelos Karachalios (Department of Research and Development, Hellenic Aerospace Industry, Schimatari, Greece.)

International Journal of Structural Integrity

ISSN: 1757-9864

Article publication date: 13 April 2015

297

Abstract

Purpose

Impact and fatigue are critical loading conditions for composite aerostructures. Compression behavior after impact and fatigue is a weak point for composite fuselage panels. The purpose of this paper is to characterize experimentally the compression behavior of carbon fiber reinforced plastic (CFRP) stiffened fuselage panels after impact and fatigue.

Design/methodology/approach

In total, three panels were manufactured and tested. The first panel was tested quasi-statically to measure the reference compression behavior. The second panel was subjected to impact so as to create barely visible impact damage (BVID) at different locations, then to fatigue and finally to quasi-static compression. Finally, the third panel was subjected to impact so as to create visible impact damage (VID) at different locations and then to quasi-static compression. The panels were tested using ultrasound inspection just after manufacturing to check material quality and between different tests to detect impact and fatigue damage accumulation. During tests the mechanical behavior of the panel was monitored using an optical displacement measurement system.

Findings

Experimental results show that the presence of impact damage significantly degrades the compression behavior of the panels. Moreover, the combined effect of BVID and fatigue was proven more severe than VID.

Originality/value

The paper gives information about the compression after impact and fatigue behavior of CFRP fuselage stiffened panels, which represent the most realistic loading scenario of composite aerostructures, and describes an integrated experimental procedure for obtaining such information.

Keywords

Acknowledgements

The research leading to these results has received funding from the European Community’s Seventh Framework Program (FP7/2007-2013) for the Clean Sky Joint Technology Initiative under Grant Agreement No. CSJU-GAM-GRA-2008-001 and Grant Agreement No. 2,96,514.

Citation

Ružek, R., Tserpes, K. and Karachalios, E. (2015), "Compression after impact and fatigue behavior of CFRP stiffened panels", International Journal of Structural Integrity, Vol. 6 No. 2, pp. 176-193. https://doi.org/10.1108/IJSI-06-2014-0030

Publisher

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Emerald Group Publishing Limited

Copyright © 2015, Emerald Group Publishing Limited

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