Modeling Mode I Fracture of Bitumen Films
Publication: Journal of Materials in Civil Engineering
Volume 25, Issue 10
Abstract
The fracture behavior of thin films of bitumen in double cantilever beam (DCB) specimens was investigated over a wide range of temperature and loading rate conditions using finite-element analysis. The model includes a phenomenological model for the mechanical behavior of bitumen, implemented into a special-purpose finite-element user material subroutine, combined with a cohesive zone model (CZM) for simulating the fracture process. The finite-element model is validated against experimental results from laboratory tests of DCB specimens by comparing measured and predicted load–line deflection histories and fracture energy release rates. Computer simulation results agreed well with experimental data of DCB joints containing bitumen films in terms of peak stress, fracture toughness, and stress-strain history response. The predicted “normalized toughness,” , was found to increase in a power-law manner with effective temperature-compensated strain rate in the ductile region as previously observed experimentally. In the brittle regime, is virtually constant. The model successfully captured the ductile and brittle failure behavior of bitumen films in opening mode (tension) for stable crack growth conditions.
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Acknowledgments
The authors are grateful for the support provided by the Nottingham Asphalt Research Consortium (NARC) through the studentship program. Partial funding was also provided by St. Catharine’s College Cambridge University and CONACYT-SEP Mexico.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 25 • Issue 10 • October 2013
Pages: 1403 - 1414
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Dec 24, 2011
Accepted: Jul 17, 2012
Published online: Aug 27, 2012
Discussion open until: Jan 27, 2013
Published in print: Oct 1, 2013
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