Cohesive modeling of delamination in Z-pin reinforced composite laminates

Venkata Dantuluri, Spandan Maiti, Philippe H. Geubelle, Rakesh Patel, Hakan Kilic

Research output: Contribution to journalArticlepeer-review


The mode I interlaminar fracture in Z-pin reinforced composite laminates is modeled using a cohesive volumetric finite element (CVFE) scheme. The test configuration used in this study is a Z-pin reinforced double cantilever beam specimen. A bilinear rate-independent but damage-dependent cohesive traction-separation law is adopted to model the fracture of the unreinforced composite and discrete nonlinear spring elements to represent the effect of the Z-pins. The delamination toughness and failure strength of the Z-pin reinforced composites are determined by a detailed comparison study of the numerical modeling results with experimental data. To further reduce the computational effort, we introduce an equivalent distributed cohesive model as a substitute for the discrete nonlinear spring representation of the Z-pins. The cohesive model is implemented on various test problems with varying failure parameters and for varying spatial Z-pin reinforcement configurations showing good agreement with the experimental results.

Original languageEnglish (US)
Pages (from-to)616-631
Number of pages16
JournalComposites Science and Technology
Issue number3-4
StatePublished - Mar 2007


  • C. Delamination
  • CVFE scheme
  • Cohesive modeling
  • Double cantilever beam
  • Fracture toughness
  • Mode I failure
  • Z-pin

ASJC Scopus subject areas

  • Ceramics and Composites
  • General Engineering


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