X-ray laminographic inspection of sandwich shell segments for wind turbine rotor blades

Speaker:
Kupsch, Andreas; BAM Bundesanstalt für Materialforschung und -prüfung; Germany

Authors:
Kupsch, A.; Federal Institute for Materials Research and Testing (BAM); Germany
Trappe, V.; Federal Institute for Materials Research and Testing (BAM); Germany
Nielow, D.; Federal Institute for Materials Research and Testing (BAM); Germany
Schumacher, D.; Federal Institute for Materials Research and Testing (BAM); Germany
Lange, A.; Federal Institute for Materials Research and Testing (BAM); Germany
Hentschel, M.P.; Federal Institute for Materials Research and Testing (BAM); Germany
Redmer, B.; Federal Institute for Materials Research and Testing (BAM); Germany
Ewert, U.; Federal Institute for Materials Research and Testing (BAM); Germany
Bruno, G.; Federal Institute for Materials Research and Testing (BAM); Germany

ID: ECNDT-0251-2018
Download: PDF
Session: X-ray radiography 3
Room: G3
Date: 2018-06-12
Time: 09:00 - 09:20

3D structural investigations are described by X-ray laminography studies of sandwich shell segments, made of a PVC foam core, covered by non-crimp fabric glass fibre composite lay-ups processed by vacuum assisted resin infusion of epoxy. The specific scope of this study is to image transversal flaws within the foam core (joints) and of single ply overlaps. Test flaws were purposely implemented in order to simulate typical failure under cyclic load. In a dedicated test rig for shell structures, the flaw evolution/propagation is monitored by thermography and optical 3D inspection of deformation. Due to the unfavourable preconditions for classical computed tomography as of large aspect ratio, the samples were investigated by coplanar translational laminography. Its limited range of observation angles of ± 45°, results in anisotropic artefacts about the normal to the sample surface, but the typical flaws are well visualized in the as-prepared state, in a state of early damage, and in the repaired state.