3D Numerical Investigation of Cement Mortar with Microscopic Defects at High Strain Rates
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 3
Abstract
This paper develops a three-dimensional (3D) microscopic model to investigate the mechanical response of cement mortar with random defects at high strain rates. Ellipsoids with randomness in size, shape, and spatial distribution are used to simulate the defects in mortar matrix. First, we propose the steps to generate the ellipsoid. Second, a “take and place” algorithm is employed to generate a model of cement mortar composed of defects. The mapping algorithm is used to generate a finite-element grid. In finite-element modeling, the material model is used in an advanced general-purpose multiphysics simulation software package to simulate the nonlinear behavior of mortar matrix with strain rate effects. Numerical simulations of the specimen under static loadings agree well with test observations, which reveal that the proposed 3D microscopic model and finite-element analytical approach can give reliable predictions. Finally, numerical studies are conducted, focusing on the effect of the defects on the dynamic responses of cement mortar. It is demonstrated that the defects have effects both on the dynamic behavior and failure pattern under high strain rate loading.
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Acknowledgments
This work is supported by the National Natural Science Foundation of China (51321064, 51478464, 51208509) and by the Program for New Century Excellent Talents in University (NCET-12-1008). We thank Mr. Zhiyuan Sun in the preparation and discussion of modeling.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 28 • Issue 3 • March 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Sep 10, 2014
Accepted: Jul 28, 2015
Published online: Sep 24, 2015
Discussion open until: Feb 24, 2016
Published in print: Mar 1, 2016
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