Correlation of nanoscale interface debonding and multimode fracture in polymer carbon composites with long-term hygrothermal effects

Masoud Yekani Fard, Brian Raji, Heidi Pankretz

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The correlation between nanoscale interface debonding and crack energy release rate for modes I, II, and I/II for extended exposure to hygrothermal conditions in polymer matrix composites (PMCs) needs to be understood. In this study, the effects on PMCs for two years of exposure, to a heat of 60 °C and relative humidity of 90%, were investigated. The interphase properties were studied using PF QNM. During hygrothermal treatment, the interphase region's thickness around the crack tip increases, and the morphology of the interphase changes. Nanoscale debonding of the fiber and matrix in artificially aged samples is a mix of cohesive and adhesive failure. Degradation at the nanoscale interphase and the macroscale crack initiation toughness slows after one year of aging. Interface debonding and nanoscale cracks cause intralaminar cracks, fiber bridging, and an increase in crack energy. Toughness in mode I fracture was increased in the artificially aged samples.

Original languageEnglish (US)
Article number103601
JournalMechanics of Materials
Volume150
DOIs
StatePublished - Nov 2020

Keywords

  • Fracture
  • Interface/interphase
  • Polymer-matrix composites (PMCs)
  • Surface analysis

ASJC Scopus subject areas

  • Materials Science(all)
  • Instrumentation
  • Mechanics of Materials

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