δ25 Crack opening displacement parameter in cohesive zone models: Experiments and simulations in asphalt concrete

S. H. Song, M. P. Wagoner, G. H. Paulino, W. G. Buttlar

Research output: Contribution to journalArticle

Abstract

Recent work with fracture characterization of asphalt concrete has shown that a cohesive zone model (CZM) provides insight into the fracture process of the materials. However, a current approach to estimate fracture energy, i.e., in terms of area of force versus crack mouth opening displacement (CMOD), for asphalt concrete overpredicts its magnitude. Therefore, the δ25 parameter, which was inspired by the δ255 concept of Schwalbe and co-workers, is proposed as an operational definition of a crack tip opening displacement (CTOD). The δ2525 measurement is incorporated into an experimental study of validation of its usefulness with asphalt concrete, and is utilized to estimate fracture energy. The work presented herein validates the δ2525 parameter for asphalt concrete, describes the experimental techniques for utilizing the δ2525 parameter, and presents three-dimensional (3D) CZM simulations with a specially tailored cohesive relation. The integration of the δ2525 parameter and new cohesive model has provided further insight into the fracture process of asphalt concrete with relatively good agreement between experimental results and numerical simulations.

Original languageEnglish (US)
Pages (from-to)850-856
Number of pages7
JournalFatigue and Fracture of Engineering Materials and Structures
Volume31
Issue number10
DOIs
StatePublished - Nov 4 2008

Keywords

  • Asphalt concrete
  • Disk-shaped compact tension (DC(T))
  • Three-dimensional cohesive zone model
  • δ

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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