Rapid evaluation of the fatigue limit in composites using infrared lock-in thermography and acoustic emission

Evangelos Kordatos, Konstantinos Dassios, Dimitrios Angelis, Theodore Matikas

Research output: Contribution to journalArticle

80 Citations (Scopus)

Abstract

Fatigue limit determination via the conventional Wöhler-curve method is associated with extendedexperimental times as it requires testing of a large number of specimens. The current paper introduces amethodology for fast, reliable and experimentally economic determination of the fatigue limit in mono-lithic and composite materials by means of combined usage of two nondestructive inspection methods,namely infrared (IR) lock-in thermography and acoustic emission (AE). IR thermography, as a real-timeand non-contact technique, allowed the detection of heat waves generated due to thermo-mechanicalcoupling as well as of the energy dissipated intrinsically during dynamic loading of the material. AE, onthe other hand, was employed to record the transient waves resulting from crack propagation events.Aluminum grade 1050 H16 and cross-ply SiC/BMAS ceramic matrix composites were subjected to fatigueloading at various stress levels and were monitored by an IR camera and AE sensors. The fatigue limitof the monolithic material, obtained by the lock-in infrared thermography technique and supported byacoustic emission was found to be in agreement with measurements obtained by the conventional S-Ncurve method. The fatigue limit of the ceramic matrix composite was validated with acoustic emissiondata.
Original languageEnglish
Pages (from-to)14-20
Number of pages7
JournalMechanics Research Communications
Volume54
Publication statusPublished - 2013

Keywords

  • Fatigue limit
  • Lock-in Thermography
  • Acoustic emission
  • CMC

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