Multimodal nondestructive inspection of impact damages in composite laminates: a case study to assess the damage volume (Conference Presentation)

Anisimov, Andrei G.; Serikova, Mariya G.; Tao, Nan; Anand, Chirag; Esrail, Fardin; Kassapoglou, Christos; Groves, Roger M.

doi:10.1117/12.2525808

Cited by 1 publication

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“…Digital shearography (DS) [1][2][3] has been used for non-destructive inspection of composite materials due to its advantages of full-field and non-contact measurement and its capability of detecting various defects (e.g., delaminations and fibre breakage). Shearography non-destructive testing (NDT) of composite laminates up to 10 mm thickness works well [4][5][6], however, for thick composite materials (e.g., with thickness of 50 mm and more), which are increasingly used in marine, wind energy and aerospace industries, the efficacy of shearography has not been fully understood.…”

Section: Introductionmentioning

confidence: 99%

Spatially modulated thermal excitations for shearography non-destructive inspection of thick composites

Tao

Anisimov²,

Groves

2021

Optical Measurement Systems for Industrial Inspection XII

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With the increasing application of thick composites in marine, wind energy and aerospace industries, the inspection of thick composites becomes more and more challenging when considering the variety of thick structures (e.g., laminate, sandwich, honeycomb structures). Shearography is a full-field and non-contact optical non-destructive testing (NDT) method which is normally used to inspect composite laminates up to 10 mm while for the thick composite laminates (e.g., with the thickness of more than 50 mm), its performance is not clear yet. In shearography NDT, a defect-induced anomaly is revealed from fringe or phase maps obtained by comparing two states of deformation of the specimen to be inspected. Thermal loading is widely used to deform the specimen due to its advantages of convenience for on-site inspection and cost-effectiveness. The objective of this study is to improve the defect detection capabilities of shearography when used to inspect thick composites. For that, spatial modulated thermal excitations are investigated. A thick composite model has been built in Abaqus to assist the shearography inspection. Various kinds of spatially modulated heating including local heating and global heating are explored for thick composite inspection with shearography in order to evaluate the corresponding efficacies in defect detection. We will present both experimental and numerical results on spatial modulated thermal loading. Defect-induced shearographic responses subjected to local and global thermal excitations will be discussed in this paper, including the influence of short-time heating and long-time heating on thick composite inspection. Current results indicate that long-time heating is more favorable when inspecting deep defects in thick composites, and with local heating it is possible to increase the defect-induced signal when compared with global heating.

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