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This work is focused on the experimental characterization oftraction-separation laws for cohesive modeling of mode-II interlaminar fracturein composites. For the experimental investigation, damage progression inend-notched flexure specimens under three-point bending was captured usingmicroscopic and macroscopic Digital Image Correlation (DIC) techniques. Thespecimens were geometrically scaled with three scaling levels for a size effectstudy. The fracture energy of the material was analyzed based on both linearelastic fracture mechanics and Bazant's type-II size effect law for comparison.For damage modeling, traction-separation laws were built from the experimentaldata, and the fracture process zones of the specimens were modeled usingcohesive interactions. Difficulties in characterizing traction-separation lawsmerely relying on load-displacement curves (i.e., global behaviors) weredemonstrated and discussed through extensive simulations. To address thisissue, through-thickness deformation analysis and progressive DIC methods wereproposed and implemented in this work. The observations and proposed methodsherein will contribute to characterizing a single traction-separation law for agiven composite material by capturing global and local fracture behaviors onany geometric scale.

Experimental characterization of traction-separation laws for  interlaminar fracture in geometrically-scaled composites using progressive  digital image correlation and through-thickness deformation analysis