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Studies on bridging tractions – simultaneous bridging tractions and COD measurements

Authors
  • Studer, M.1
  • Pietrzyk, J.1
  • Peters, K.2
  • Botsis, J.1
  • Giaccari, P.3
  • 1 Ecole Polytechnique Fédérale de Lausanne, Laboratory of Applied Mechanics and Reliability Analysis, Department of Mechanical Engineering, Lausanne, CH 1015, Switzerland , Lausanne
  • 2 North Carolina State University, Department of Mechanical and Aerospace Engineering, Raleigh, NC, 27695, U.S.A , Raleigh
  • 3 Ecole Polytechnique Fédérale de Lausanne, Institute of Applied Optics, Department of Microengineering, Lausanne, CH 1015, Switzerland , Lausanne
Type
Published Article
Journal
International Journal of Fracture
Publisher
Kluwer Academic Publishers
Publication Date
Apr 01, 2002
Volume
114
Issue
4
Pages
379–399
Identifiers
DOI: 10.1023/A:1015798126787
Source
Springer Nature
Keywords
License
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Abstract

The main objective of this work is to investigate the bridging tractions in a model composite using optical fiber Bragg grating (FBG) sensors written into selected reinforcing fibers. Simultaneously, the crack opening displacement (COD) is measured using a speckle interferometry technique. The measurements are useful in the verification of the relation between the COD and bridging tractions established with the use of the weight function method. Center crack specimens made of epoxy and reinforced with one layer of optical fibers are prepared and tested under remote tension parallel to the fibers. Bragg gratings of 0.17 to 0.38 mm in length are introduced in selected fibers for direct, non invasive, local measurements of axial strains in these fibers. A controlled central crack, bridged by intact fibers, is introduced by a laser technique such that the FBGs are located between the crack faces. The results on the forces obtained from the FBGs and the COD-weight function method show good agreement. The experimental results also compare very well with 3-dimensional numerical simulations of the actual specimen geometry and loading configuration.

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