Journal
ENGINEERING FRACTURE MECHANICS
Volume 97, Issue -, Pages 281-296Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2012.10.010
Keywords
Asphalt; Cohesive zone models; Fracture mechanics; Three-point bending
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Funding
- Nottingham Asphalt Research Consortium (NARC)
- St. Catharine's College Cambridge University
- CONACYT-SEP Mexico
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This work presents an experimental and numerical investigation to characterise the fracture properties of pure bitumen (the binder in asphalt paving materials). The paper is divided into two parts. The first part describes an experimental study of fracture characterisation parameters of pure bitumen as determined by three-point bend tests. The second part deals with modelling of fracture and failure of bitumen by Finite Element analysis. Fracture mechanics parameters, stress intensity factor, K-IC, fracture energy, G(IC), and J-integral, J(IC), are used for evaluation of bitumen's fracture properties. The material constitutive model developed by Ossa et al. [40,41] which was implemented into a FE code by Costanzi [18] is combined with cohesive zone models (CZM) to simulate the fracture behaviour of pure bitumen. Experimental and numerical results are presented in the form of failure mechanism maps where ductile, brittle and brittle-ductile transition regimes of fracture behaviour are classified. The FE predictions of fracture behaviour match well with experimental results. (C) 2012 Elsevier Ltd. All rights reserved.
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