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This study investigates the mode I intra-laminar fracture and size effect inDiscontinuous Fiber Composites (DFCs). Towards this goal, the results offracture tests on geometrically-scaled Single Edge Notch Tension (SENT)specimens are presented and critically discussed for three platelet sizes.  The results clearly show a decrease in nominal strength as the specimen sizeincreases. This effect becomes more important as the structure size increases.It is found that, when the specimen is sufficiently large, the structuralstrength scales according to Linear Elastic Fracture Mechanics (LEFM) and thefailure occurs in a very brittle way. In contrast, small specimens exhibit amore pronounced pseudo-ductility with a limited scaling effect and asignificant deviation from LEFM.  To characterize the fracture energy and the effective length of the fractureprocess zone, an approach combining equivalent fracture mechanics andstochastic finite element modeling is proposed. The model accounts for thecomplex random mesostructure of the material by modeling the plateletsexplicitly. Thanks to this theoretical framework, the mode I fracture energy ofDFCs is estimated for the first time and it is shown to depend significantly onthe platelet size. In particular, the fracture energy is shown to increaselinearly with the platelet size in the range investigated in this work.

Fracturing Behavior and Size Effect of Discontinuous Fiber Composite Structures with Different Platelet Sizes