FEM-assisted shearography with spatially modulated heating for non-destructive testing of thick composites with deep defects

This study aims at improving shearography non-destructive testing (NDT) of deep defects in thick composites with thermal loading. Instead conventional global heating (GH), the core idea is to apply novel spatially modulated (SMH) for NDT. In this paper, finite element method (FEM) has been used advance towards a quantitative inspection tool composites. Both GH and SMH have performed experimentally modelled Abaqus evaluate corresponding efficacies detection defects. was achieved by using halogen lamp Fresnel lens. The heat flux distribution on specimen surface taken into consideration defect detection, factor which rarely reported inspection. Besides, influence different reference states NDT also studied looking defect-induced phase maps from shearography. results indicate that proposed can improve 2 3 times GH. It should be addressed similar defect-free sample currently necessary compare defective one.