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δ 25 Crack opening displacement parameter in cohesive zone models: experiments and simulations in asphalt concrete
Author(s) -
SONG S. H.,
WAGONER M. P.,
PAULINO G. H.,
BUTTLAR W. G.
Publication year - 2008
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.2008.01272.x
Subject(s) - cohesive zone model , displacement (psychology) , asphalt concrete , asphalt , fracture (geology) , fracture mechanics , materials science , work (physics) , structural engineering , geotechnical engineering , engineering , composite material , mechanical engineering , psychology , psychotherapist
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 δ 25 parameter, which was inspired by the δ 5 concept of Schwalbe and co‐workers, is proposed as an operational definition of a crack tip opening displacement (CTOD). The δ 25 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 δ 25 parameter for asphalt concrete, describes the experimental techniques for utilizing the δ 25 parameter, and presents three‐dimensional (3D) CZM simulations with a specially tailored cohesive relation. The integration of the δ 25 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.