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Lightweight Stiffened Panels Fabricated Using Emerging Fabrication Technologies: Fatigue Behaviour

  • P. M. G. P. MoreiraEmail author
  • V. Richter-Trummer
  • P. M. S. T. de Castro
Chapter
Part of the Advanced Structured Materials book series (STRUCTMAT, volume 8)

Abstract

The need for lower cost and the emergence of new welding technologies has brought interest in large integral metallic structures for aircraft applications; however, new problems must be addressed, e.g. in integral structures, a crack approaching a stiffener propagates simultaneously in the skin and into the stiffener and breaks it. The use of manufacturing techniques such as high speed machining (HSM), laser beam welding (LBW) and friction stir welding (FSW) requires further experimental and numerical work concerning the fatigue behaviour of panels manufactured using those processes. This chapter is focused on an experimental test programme including fatigue crack growth rate characterization in panels fabricated using HSM, LBW and FSW. The work was developed in the frame of the European Union DaToN project. Data was obtained for panels tested in mode I crack propagation under load ratios (R) of 0.1 and 0.5. It was found that welded panels presented longer lives up to rupture. This result is associated to the residual stress fields existing in the welded panels, and also to the location of the initial artificial defect, placed in the skin midway the specimen’s two stiffeners.

Keywords

Fatigue Crack Stress Intensity Factor Fatigue Life Crack Growth Rate Friction Stir Welding 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This research is part of IDMEC-Porto contribution to the EU project DaToN contract FP6-516053. The authors acknowledge the collaboration of Mr. Miguel A. V. de Figueiredo and Mr. Rui Silva in the experiments. Dr. Moreira acknowledges POPHQREN-Tipologia 4.2—Promotion of scientific employment funded by the ESF and MCTES.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • P. M. G. P. Moreira
    • 1
    Email author
  • V. Richter-Trummer
    • 2
  • P. M. S. T. de Castro
    • 2
  1. 1.INEGI, Institute of Mechanical Engineering and Industrial ManagementPortoPortugal
  2. 2.Faculdade de Engenharia da Universidade do Porto, and IDMEC-PortoPortoPortugal

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