Journal
NDT & E INTERNATIONAL
Volume 111, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ndteint.2020.102219
Keywords
Laser speckle imaging; Non-destructive testing; Remote strain sensing; Digital image correlation
Funding
- Rail Manufacturing Cooperative Research Centre, Australia
- Rail Manufacturing Cooperative Research Centre, Australia (Australian Federal Government's Business Cooperative Research Centres Program)
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Strain sensing around the fastener holes is fundamentally significant in structural health monitoring and failure detections. Conventional non-destructive testing (NDT) techniques typically have limitations in performing reliable and efficient inspections. Here, a laser speckle imaging system (LSIS) has been developed to achieve non-contact, non-destructive and remote strain sensing. Methods for determining optimal laser speckle patterns have been investigated to achieve remote sensing of strain up to a working distance of 5 m. This LSIS was applied to study the anisotropic properties of un-notched and circular notched specimens in cold-rolled aluminium sheet, an important material for the construction of lightweight aircraft structures. The results showed that strain distributions determined by LSIS are consistent with finite element (FE) predictions in which the evolution of strain concentrations not only depends on the notch size but also on material anisotropy. This study demonstrates the potential application of LSIS as an effective NDT technique for full-field, non-contact and remote sensing of anisotropic deformation around fastener holes.
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