In situ damage characterization of CFRP under compression using high-speed optical, infrared and synchrotron X-ray phase-contrast imaging

Nazanin Pournoori, Guilherme Corrêa Soares, Bratislav Lukić, Matti Isakov, Maria Clara Lessa Belone, Mikko Hokka, Mikko Kanerva

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

The strain rate dependency and failure modes of carbon fiber reinforced plastic (CFRP) laminate were investigated under out-of-plane compressive loading. Simultaneous high-speed optical and infrared imaging were used to measure full-field deformation and temperature in the dynamically loaded specimens. The damage initiation and propagation inside the CFRP laminates at high strain rates were characterized using in-situ ultra-fast synchrotron X-ray phase contrast imaging (XPCI). The visually observed damage onset occurs at the strain value of 4.2 ± 0.6% as a transverse shear fracture at the free edge of specimens. The local temperature increases significantly to 185 °C due to damage initiation at high strain rates, while at low strain rates the temperature rise occurs after the final shear band forms. The XPCI and post-failure analysis provide an integrated perspective on the formation of a diagonal shear crack and disintegration of the specimen into two pieces with the fracture of plies in the in-plane transverse direction. Scanning electron microscopic (SEM) study was integrated with XPCI results to append the time scale for the post-mortem failure pattern as well as the length scale for microcracks and filament-level failure.

Original languageEnglish
Article number107766
JournalComposites Part A: Applied Science and Manufacturing
Volume175
DOIs
Publication statusPublished - Dec 2023
Publication typeA1 Journal article-refereed

Keywords

  • Adiabatic heating
  • Carbon fiber-reinforced polymer composites
  • Compressive damage
  • High strain rate

Publication forum classification

  • Publication forum level 2

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials

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