A novel machine learning model to design historical-independent health indicators for composite structures

Morteza Moradi*, Ferda C. Gul, Dimitrios Zarouchas

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Developing comprehensive health indicators (HIs) for composite structures encompassing various damage types is challenging due to the stochastic nature of damage accumulation and uncertain events (like impact) during operation. This complexity is amplified when striving for HIs independent of historical data. This paper introduces an AI-driven approach, the Hilbert transform-convolutional neural network under a semi-supervised learning paradigm, to designing reliable HIs (fulfilling requirements, referred to as 'fitness'). It exclusively utilizes current guided wave data, eliminating the need for historical information. Ensemble learning techniques were also used to enhance HI quality while reducing deep learning randomness. The fitness equation is refined for dependable comparisons and practicality. The methodology is validated through investigations on T-single stiffener CFRP panels under compression-fatigue and dogbone CFRP specimens under tension-fatigue loadings, showing high performance of up to 93% and 81%, respectively, in prognostic criteria.

Original languageEnglish
Article number111328
JournalComposites Part B: Engineering
Volume275
DOIs
Publication statusPublished - 2024

Keywords

  • Compression-compression fatigue
  • Intelligent health indicator
  • Prognostics and health management
  • Semi-supervised learning
  • T-single stiffener CFRP
  • Tension-tension fatigue

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