A mechanistic approach to matrix cracking coupled with fiber-matrix debonding in short-fiber composites

Ba Nghiep Nguyen, Brian J. Tucker, Mohammad A. Khaleel

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

A micro-macro mechanistic approach to damage in short-fiber composites is developed in this paper. At the microscale, a reference aligned fiber composite is considered for the analysis of the damage mechanisms such as matrix cracking and fiber-matrix debonding using the modified Mori-Tanaka model. The associated damage variables are defined, and the stiffness reduction law dependent on these variables is established. The stiffness of a random fiber composite containing random matrix microcracks and imperfect interfaces is then obtained from that of the reference composite, which is averaged over all possible orientations and weighted by an orientation distribution function. The macroscopic response is determined using a continuum damage mechanics approach and finite element analysis. Final failure resulting from saturation of matrix microcracks, fiber pull-out and breakage is modeled by a vanishing element technique. The model is validated using the experimental results found in literature as well as the results obtained for a random chopped fiber glass-vinyl ester system. Acoustic emission techniques were used to quantify the amount and type of damage during quasi-static testing.

Original languageEnglish
Pages (from-to)337-350
Number of pages14
JournalJournal of Engineering Materials and Technology, Transactions of the ASME
Volume127
Issue number3
DOIs
Publication statusPublished - 1 Jul 2005
Externally publishedYes

Fingerprint

fiber composites
Debonding
damage
fibers
Fibers
Composite materials
matrices
microcracks
Microcracks
stiffness
Stiffness
Continuum damage mechanics
acoustic emission
glass fibers
Acoustic emissions
microbalances
Glass fibers
Distribution functions
Macros
esters

Keywords

  • Acoustic emission
  • Fiber pull-out
  • Fiber-matrix debonding
  • Finite element analysis
  • Matrix cracking
  • Multiscale modeling
  • Short-fiber composite

ASJC Scopus subject areas

  • Mechanical Engineering
  • Materials Science(all)

Cite this

A mechanistic approach to matrix cracking coupled with fiber-matrix debonding in short-fiber composites. / Nguyen, Ba Nghiep; Tucker, Brian J.; Khaleel, Mohammad A.

In: Journal of Engineering Materials and Technology, Transactions of the ASME, Vol. 127, No. 3, 01.07.2005, p. 337-350.

Research output: Contribution to journalArticle

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