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Three-dimensional finite-element simulation of the dynamic Brazilian tests on concrete cylinders

Ruiz, Gonzalo and Ortiz, Michael and Pandolfi, Anna (2000) Three-dimensional finite-element simulation of the dynamic Brazilian tests on concrete cylinders. International Journal for Numerical Methods in Engineering, 48 (7). pp. 963-994. ISSN 0029-5981. https://resolver.caltech.edu/CaltechAUTHORS:20171212-154848578

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Abstract

We investigate the feasibility of using cohesive theories of fracture, in conjunction with the direct simulation of fracture and fragmentation, in order to describe processes of tensile damage and compressive crushing in concrete specimens subjected to dynamic loading. We account explicitly for microcracking, the development of macroscopic cracks and inertia, and the effective dynamic behaviour of the material is predicted as an outcome of the calculations. The cohesive properties of the material are assumed to be rate-independent and are therefore determined by static properties such as the static tensile strength. The ability of model to predict the dynamic behaviour of concrete may be traced to the fact that cohesive theories endow the material with an intrinsic time scale. The particular configuration contemplated in this study is the Brazilian cylinder test performed in a Hopkinson bar. Our simulations capture closely the experimentally observed rate sensitivity of the dynamic strength of concrete in the form of a nearly linear increase in dynamic strength with strain rate. More generally, our simulations give accurate transmitted loads over a range of strain rates, which attests to the fidelity of the model where rate effects are concerned. The model also predicts key features of the fracture pattern such as the primary lens-shaped cracks parallel to the load plane, as well as the secondary profuse cracking near the supports. The primary cracks are predicted to be nucleated at the centre of the circular bases of the cylinder and to subsequently propagate towards the interior, in accordance with experimental observations. The primary and secondary cracks are responsible for two peaks in the load history, also in keeping with experiment. The results of the simulations also exhibit a size effect. These results validate the theory as it bears on mixed-mode fracture and fragmentation processes in concrete over a range of strain rates.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://dx.doi.org/10.1002/(SICI)1097-0207(20000710)48:7<963::AID-NME908>3.0.CO;2-XDOIArticle
http://onlinelibrary.wiley.com/doi/10.1002/(SICI)1097-0207(20000710)48:7%3C963::AID-NME908%3E3.0.CO;2-X/abstractPublisherArticle
ORCID:
AuthorORCID
Ortiz, Michael0000-0001-5877-4824
Pandolfi, Anna0000-0002-7084-7456
Additional Information:© 2000 John Wiley & Sons. Received 29 January 1999. Revised 15 September 1999. Gonzalo Ruiz gratefully acknowledges the financial support for his stay at the California Institute of Technology provided by the Dirección General de Enseñanza Superior, Ministerio de Educación y Cultura, Spain. Anna Pandolfi and Michael Ortiz are grateful for support from the Department of Energy through Caltech’s ASCI Center of Excellence for Simulating Dynamic Response of Materials. Michael Ortiz also wishes to gratefully acknowledge the support of the Army Research Office through grant DAAH04-96-1-0056. We are indebted to Dr. Raúl A. Radovitzky for his assistance in the development of the meshes used throughout this research.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Ministerio de Educación y Cultura (MEC)UNSPECIFIED
Army Research Office (ARO)DAAH04-96-1-0056
Subject Keywords:concrete; fracture; cohesive elements; dynamic strength; mixed mode fracture; size effect; strain rate effect
Issue or Number:7
Record Number:CaltechAUTHORS:20171212-154848578
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20171212-154848578
Official Citation:Ruiz, G., Ortiz, M. and Pandolfi, A. (2000), Three-dimensional finite-element simulation of the dynamic Brazilian tests on concrete cylinders. Int. J. Numer. Meth. Engng., 48: 963–994. doi:10.1002/(SICI)1097-0207(20000710)48:7<963::AID-NME908>3.0.CO;2-X
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:83848
Collection:CaltechAUTHORS
Deposited By: Lydia Suarez
Deposited On:19 Dec 2017 19:54
Last Modified:24 Feb 2020 10:30

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