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Optimal Design of a Composite Scarf Repair Patch Under Tensile Loading

[+] Author Affiliations
T. D. Breitzman, E. R. Ripberger

Air Force Research Laboratory, Wright-Patterson AFB, OH

E. V. Iarve

University of Dayton Research Institute, Dayton, OH

Paper No. IMECE2010-40534, pp. 269-271; 3 pages
doi:10.1115/IMECE2010-40534
From:
  • ASME 2010 International Mechanical Engineering Congress and Exposition
  • Volume 3: Design and Manufacturing, Parts A and B
  • Vancouver, British Columbia, Canada, November 12–18, 2010
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4427-4
  • Copyright © 2010 by ASME

abstract

Mechanics of the composite scarf repair under tensile loading with and without overlay plies was examined for nontraditional patch ply orientations. Three-dimensional nonlinear analysis was performed for repair failure prediction and good baseline comparison for open-hole scarfed panels and panels repaired by using standard ply-by-ply replacement patch composition was achieved. Multidimensional optimization was performed to calculate the repair patch ply orientations which minimize the von Mises stresses in the adhesive. These optimal stacking sequences achieved significant reduction of the stress levels and resulted in predicted up to 75% and 85% strength restoration for flush and single ply thickness over-ply repair. These results are intended to illustrate additional design variables available for efficient composite repair design, namely the composition of the repair patch.

Copyright © 2010 by ASME

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