29-08-2017, 01:13 PM
Guided waves generated by the ultrasound coupled to the air provide non-contact anisotropy monitoring of plane stiffness and high contrast images of defects in a single-sided access configuration. The mapping of the local orientation of the fibers in the composite materials and the residual stresses induced by the plastic deformation in the metals are reliably implemented with birefringent shear waves. It is demonstrated that nonlinear ultrasound is sensitive to incipient fatigue in metals and is applicable to imaging a wide range of defects that could occur during the manufacture, processing and operation of aerospace materials and components.
The development of contemporary aerospace materials (AES-) is a crossroads of technological problems caused by a mass of stringent performance requirements, such as heat and corrosion resistance, fatigue and damage tolerance, high strength / weight ratio, safety And environmental constraints. To meet these requirements, the AES materials used cover a variety of metals, alloys, polymers and composites. They are combined in a number of structures (sheet-shaped parts, layered systems, honeycomb components, stringers, frames, etc.) and are processed using different forming techniques, such as injection molding, placement, laser welding And friction, Shot-peening, etc. It is not surprising that non-destructive characterization of AES configurations becomes an exceptionally difficult task and should encompass various measurement approaches.
The development of contemporary aerospace materials (AES-) is a crossroads of technological problems caused by a mass of stringent performance requirements, such as heat and corrosion resistance, fatigue and damage tolerance, high strength / weight ratio, safety And environmental constraints. To meet these requirements, the AES materials used cover a variety of metals, alloys, polymers and composites. They are combined in a number of structures (sheet-shaped parts, layered systems, honeycomb components, stringers, frames, etc.) and are processed using different forming techniques, such as injection molding, placement, laser welding And friction, Shot-peening, etc. It is not surprising that non-destructive characterization of AES configurations becomes an exceptionally difficult task and should encompass various measurement approaches.