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- Title
δ<sub>25</sub> Crack opening displacement parameter in cohesive zone models: experiments and simulations in asphalt concrete.
- Authors
SONG, S. H.; WAGONER, M. P.; PAULINO, G. H.; BUTTLAR, W. G.
- 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 δ5 concept of Schwalbe and co-workers, is proposed as an operational definition of a crack tip opening displacement (CTOD). The δ25 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 δ25 parameter for asphalt concrete, describes the experimental techniques for utilizing the δ25 parameter, and presents three-dimensional (3D) CZM simulations with a specially tailored cohesive relation. The integration of the δ25 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.
- Subjects
CRACKING of concrete; ASPHALT; SIMULATION methods &; models; BITUMINOUS materials; FRACTURE mechanics
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2008, Vol 31, Issue 10, p850
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/j.1460-2695.2008.01272.x