Mode I delamination of a five harness satin weave carbon fibre composite and the corresponding toughening mechanisms are studied using a multiscale finite element model of delamination growth in a double cantilever beam (DCB) specimen. The toughening mechanisms related to the fabric structure are studied by embedding a meso-scale model of the fibre architecture in the delamination zone into a macro-scale model of a DCB specimen. The R-curves and the load displacement curves obtained from this analysis agree with the lower bound of the experimental results. The analysis identified two major toughening mechanisms: the inter-yarn locking ahead of the delamination front causing stress relaxation and the formation of sub-surfaces. Contribution of each toughening mechanism towards total delamination toughness is quantitatively evaluated, identifying the inter-yarn locking as the main source of toughening in mode I delamination of fabric composites. Video abstract: Multimedia 1 shows the different stages of the mode I delamination growth in a 5HS composite DCB specimen and its corresponding load displacement curve. (C) 2015 Elsevier Ltd. All rights reserved.
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Univ Delaware, Ctr Composite Mat, Newark, DE 19716 USA
Univ Delaware, Dept Mat Sci & Engn, Newark, DE 19716 USAUniv Delaware, Ctr Composite Mat, Newark, DE 19716 USA
Nilakantan, Gaurav
Keefe, Michael
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Univ Delaware, Ctr Composite Mat, Newark, DE 19716 USA
Univ Delaware, Dept Mech Engn, Newark, DE 19716 USAUniv Delaware, Ctr Composite Mat, Newark, DE 19716 USA
Keefe, Michael
Bogetti, Travis A.
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USA, Res Lab, Aberdeen Proving Ground, MD 21005 USAUniv Delaware, Ctr Composite Mat, Newark, DE 19716 USA
Bogetti, Travis A.
Adkinson, Rob
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USA, Res Lab, Aberdeen Proving Ground, MD 21005 USAUniv Delaware, Ctr Composite Mat, Newark, DE 19716 USA
Adkinson, Rob
Gillespie, John W., Jr.
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Univ Delaware, Ctr Composite Mat, Newark, DE 19716 USA
Univ Delaware, Dept Mat Sci & Engn, Newark, DE 19716 USA
Univ Delaware, Dept Civil & Environm Engn, Newark, DE 19716 USAUniv Delaware, Ctr Composite Mat, Newark, DE 19716 USA