Stress-Strain Behavior and Statistical Continuous Damage Model of Cement Mortar under High Strain Rates
Publication: Journal of Materials in Civil Engineering
Volume 25, Issue 1
Abstract
The effects of strain rate on the dynamic stress-strain behavior of cement mortar were investigated in split Hopkinson pressure bar (SHPB) tests; the resulting strain rates ranged from 20 to . A total of 39 specimens were subjected to static and dynamic axial compressive loadings. The results showed that cement mortar is a typical strain-rate dependent material. Both dynamic compressive strength and critical strain increased with strain-rate increases. However, there seemed to be no strain-rate effects on the initial elastic modulus of cement mortar. Based on the stress-strain curves of different strain rates, as well as the random statistical distribution hypothesis for strength, a dynamic damage constitutive model of cement model under compression was used. The relationships of the primary parameters for strain rate are also presented in this paper. The simulated stress-strain curves matched the experimental results well. The results showed that the strength of cement mortar obeyed a Weibull distribution.
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Acknowledgments
The authors are grateful to the National Natural Science Foundation of China (Grant Nos. 50979032 and 51178162) for financial support.
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Published In
Journal of Materials in Civil Engineering
Volume 25 • Issue 1 • January 2013
Pages: 120 - 130
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Oct 1, 2011
Accepted: Apr 20, 2012
Published online: Apr 23, 2012
Published in print: Jan 1, 2013
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