4.7 Article

Microwave near-field and far-field imaging of composite plate with hat stiffeners

Journal

COMPOSITES PART B-ENGINEERING
Volume 161, Issue -, Pages 87-95

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2018.10.058

Keywords

Defects; Non-destructive testing; Resin flow; Microwave imaging

Funding

  1. National Natural Science Foundation of China [11522214,11521202, 11602087]
  2. Science Challenge Project
  3. China Postdoctoral Science Foundation [2016M602457]
  4. Fundamental Research Funds for the Central Universities [20178Q097]
  5. Planning Project of Beijing Municipal Science and Technology Commission [Z161100001416007]

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Composite stiffened structures that are widely used in engineering inevitably produce various defects in manufacturing and service. In order to detect them, a microwave nondestructive testing platform is built in this paper, which simply combines near-field and far-field microwave scanning imaging. 0.4 mm metal hole, 0.5 mm and 1 mm inclusions and 0.1 mm thick debonding are detected by high resolution microwave near-field imaging. Internal poor resin infusions defects in 39 mm thick hat stiffener are detected by high penetration microwave far-field imaging. Far-field microwave images the shape and internal structure of stiffener by adjusting stand-off distance. Detection of the fiber wrinkling defects demonstrates the effectiveness of combining near-field and far-field imaging methods, saving 95% of the scan imaging time. Feature-based image stitching technique is adopted to obtain the full-size image of the large stiffened composite structure.

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