Quantitative characterization of multiple delaminations in laminated composites using the Compton backscatter technique

Nohyu Kim*, J. D. Achenbach

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

A Compton X-ray backscatter technique was used to supplement ultrasonic pulse-echo C-scan imaging to quantitatively assess the impact damage in quasi-isotropic laminated composites which were impacted by a drop-weight tester. A Compton backscatter imaging system with a slit-type camera was developed to obtain a cross-sectional profile of impact-damaged laminated composites from the density variation of the cross-section. A nonlinear reconstruction model is introduced to overcome distortion of the Compton backscatter image due to attenuation effects, beam hardening, and irregular distributions of the fibers and the matrix in composites. An adaptive filter is used to reduce noise from many sources including quantum noise, especially when the SNR (signal-to-noise ratio) of the image is relatively low. Delaminations masked or distorted by the first few delaminations in an ultrasonic C-scan image are detected and characterized by the Compton backscatter technique, both in width and location.

Original languageEnglish (US)
Pages (from-to)53-65
Number of pages13
JournalJournal of Nondestructive Evaluation
Volume17
Issue number2
DOIs
StatePublished - 1998

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering

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