“…During their lifetime, composites are subject to various impacts that may compromise their structural integrity [18]. Particularly hazardous are subsurface changes invisible to the human eye [19]. Independent from the composite type, manufacturing-induced inhomogeneities may occur between layers (delamination, un-infiltration), in the resin matrix (resin-rich area, void, impurity, porosity), and the fiber reinforcement (fiber misalignments such as waviness or wrinkling, breakage).…”