6533b86cfe1ef96bd12c8286
RESEARCH PRODUCT
Flying Laser Spot Thermography technique for the NDE of Fibre Metal Laminates disbonds
Giuseppe PitarresiDonatella CernigliaNicola Montinarosubject
Work (thermodynamics)Materials scienceNon-destructive testingLaserCeramics and Composite02 engineering and technology01 natural scienceslaw.inventionSettore ING-IND/14 - Progettazione Meccanica E Costruzione Di MacchineLayered structurelawNondestructive testing0103 physical sciencesThermalFinite Element Analysis (FEA)Composite materialCivil and Structural Engineering010302 applied physicsbusiness.industryDelamination021001 nanoscience & nanotechnologyLaserFinite element methodIR thermographyDelaminationCeramics and CompositesHeat equation0210 nano-technologyRaster scanbusinessdescription
Abstract The present work investigates the features of an active Infrared-NDT Thermography technique derived from a Flying Laser Spot set-up for the analysis of interlaminar disbonds in layered structures in general and Fibre Metal Laminates in particular. The presented technique uses a laser-spot heat source, which moves at a constant speed, raster scanning the object surface. Interlaminar defects parallel to the surfaces act as barriers towards through-the-thickness heat diffusion. This produces some modifications over the surface thermal field which are well identified in the Standard Deviation calculated over a Reference Area following the heat source. The mechanisms leading to such defect signature are investigated in this work by means of Finite Element Analyses which model the dynamic thermal problem on a GLARE sample with triangular disbond defects at inner interfaces. An extended number of parameters is changed to study their influence on the defect signature, and the FEA analysis is also compared to an analytical and an experimental case studies for further validation.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-07-01 |