Design and manufacturing optimization of epoxy-based adhesive specimens for multiaxial tests

Specimen design and manufacturing quality are decisive factors in the experimental determination of material properties, because they can only be reliably determined if all undesired influences have been minimized or precisely known. The manufacture specimens from highly viscous, two-component fiber-reinforced structural adhesives presents a challenge this point view. Therefore, optimization procedure for multiaxial testing was developed. It incorporated finite element parametric study to minimize stress concentrations specimen geometry. Vacuum speed mixing combined with 3D printed mold inserts enable homogeneous negligible porosity. method demonstrated by means adhesive used wind turbine rotor blades, while verified high-resolution X-ray microscopy (μCT scanning), enabling detailed detection pores geometrical imperfections. results uniaxial biaxial static tests show maximized strength stiffness scatter comparison that stated international literature. A mechanical properties associated techniques is given. includes porosity analysis an industrial dosing machine blade manufacture.