DUGi

Fast and simple method for prediction of the micromechanical parameters and macromechanical properties of composite materials

http://dugi.udg.edu/item/http:@@@@hdl.handle.net@@2072@@284759

The method described in the present work was assessed through the production of composite materials made ofpolypropylene reinforced with chemical thermomechanical pulp of hemp core fibers. Composite materials wereobtained by extrusion and injection molding, and by the addition of a coupling agent to ensure a good interphasebetween fiber and matrix. In all cases, the composite materials were considered as semi-aligned reinforced.Tensile strength was selected as a representative parameter and was studied by the Kelly-Tyson model.1 Sincethe original Kelly-Tyson equation was formulated for fully aligned reinforced composite materials, the presentwork uses a modified one, where the orientation factor is included. The fiber length and diameter distributionwere determined by the extraction of the fibers from the composite materials and analyzed in a MorFiequipment. The orientation factor was calculated taking into account the predicted tensile strength for fullyaligned composites and the experimental value from the semi-aligned ones. The interfacial shear strength wasestimated through Tresca and Von Mises criteria. The values obtained through the simulation were compared tothe experimental ones, showing a good correlation between the mathematical model and the experimental part

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