A bilinear cohesive zone model tailored for fracture of asphalt concrete considering viscoelastic bulk material

Seong Hyeok Song, Glaucio H. Paulino, William G. Buttlar

Research output: Contribution to journalArticle


A bilinear cohesive zone model (CZM) is employed in conjunction with a viscoelastic bulk (background) material to investigate fracture behavior of asphalt concrete. An attractive feature of the bilinear CZM is a potential reduction of artificial compliance inherent in the intrinsic CZM. In this study, finite material strength and cohesive fracture energy, which are cohesive parameters, are obtained from laboratory experiments. Finite element implementation of the CZM is accomplished by means of a user-subroutine which is employed in a commercial finite element code (e.g., UEL in ABAQUS). The cohesive parameters are calibrated by simulation of mode I disk-shaped compact tension results. The ability to simulate mixed-mode fracture is demonstrated. The single-edge notched beam test is simulated where cohesive elements are inserted over an area to allow cracks to propagate in any general direction. The predicted mixed-mode crack trajectory is found to be in close agreement with experimental results. Furthermore, various aspects of CZMs and fracture behavior in asphalt concrete are discussed including: compliance, convergence, and energy balance.

Original languageEnglish (US)
Pages (from-to)2829-2848
Number of pages20
JournalEngineering Fracture Mechanics
Issue number18
StatePublished - Dec 1 2006



  • Asphalt concrete
  • Bilinear cohesive zone model
  • Compliance
  • Convergence
  • Crack propagation
  • Fracture
  • Rate effects
  • User element (UEL)

ASJC Scopus subject areas

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

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