The influence of resin starved area manufacturing imperfections on the mechanical performance of non-crimp fabric cfrp laminate
Sprache des Vortragstitels:
21st International Conference on Composite Materials ICCM21
Sprache des Tagungstitel:
Resin starved areas or dry spots are considered a severe manufacturing defect in resin transfer molded composite parts, thus often leading to rejects. However, they are rarely mentioned in literature. In this work, the mechanical performance of specimens with artificially introduced resin starved areas under static and fatigue loading is investigated. As a side effect of the defect introduction, the specimen is not symmetrical anymore and some complicated deformation occurs under loading. Displacements, strains and fracture processes are recorded via two 3D DIC systems, on both sides of the specimen. Thereby, the complete sequence of the damage processes during static and fatigue loading can be analyzed. It is found that for this specimen the out of plane displacement is a good indicator for matrix damage and material relaxation. Static failure takes place at the edges surrounding the resin starved area. Fatigue damage is initiated in the resin starved area by longitudinal splitting and fiber fracture, which grows progressively over the whole specimen width.