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In-situ Full Field Measurements During Inter-Facial Debonding in Single Fiber Composite Under Transverse Load

  • I. Tabiai
  • R. Delorme
  • D. Therriault
  • M. Levesque
Article
  • 32 Downloads

Abstract

The fibre/matrix interfacial damage mechanisms of fiber-reinforced composites (FRCs) are investigated for single-fiber composites under transverse load. A stereo microscope setup is used for 3D digital image correlation during in-situ quasi-static tests of single-fiber standard dog-bone specimens. Macro-fibers (0.9 mm diameter) with radically different interfacial bonding with the epoxy matrix are used. Damage appears to initiate with fiber debonding at the free surface along the tensile direction. The crack then propagates around the interface while slightly growing along the fiber until a lateral crack initiates on the debonded free surface, provoking specimen failure. The final failure mechanisms appears to be different for strong and weak fiber/matrix bonding. 3D DIC is used to provide precise measurements of displacements, strains, and out-of-plane displacement during the whole test. Quantitative differences in the displacement fields are measured in the cases of strong and weak bonding between the fiber and matrix. 3D DIC with macro-fibers is shown to be a promising technique to provide a better understanding of the damage mechanisms in a single-fiber composite and to determine interfacial toughness of a specific fibre/matrix couple in order to perform accurate modeling of damage in FRCs. Displacement, strain, and confidence field results for each pixel from each experiment and at each time step are also provided for detailed comparison with simulation results.

Keywords

Stereoscopic digital image correlation Interface fracture Single fiber composite Debonding Fiber reinforced composites 

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Copyright information

© Society for Experimental Mechanics 2018

Authors and Affiliations

  1. 1.Laboratory of Multiscale Mechanics, Department of Mechanical EngineeringPolytechnique MontrealMontréalCanada

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