Numerical Analysis of the Dynamic Tensile Behavior of Cement-Based Materials using a Gravity-Driven Hopkinson Tension Bar

Authors

  • Ammar Babiker School of Civil Engineering, College of Engineering, Sudan University of Science and Technology, P.O. Box 72, Eastern Daim, Khartoum, Sudan https://orcid.org/0000-0002-4081-5015
  • Ebtihaj Abu-Elgasim School of Civil Engineering, College of Engineering, Sudan University of Science and Technology, P.O. Box 72, Eastern Daim, Khartoum, Sudan https://orcid.org/0009-0005-0452-0016
  • Mashair Mohammed School of Civil Engineering, College of Engineering, Sudan University of Science and Technology, P.O. Box 72, Eastern Daim, Khartoum, Sudan https://orcid.org/0009-0000-2597-5646

DOI:

https://doi.org/10.1590/1679-78257483

Abstract

Dynamic characterization of cement-based composites is crucial for understanding material behavior. When exposed to highly dynamic loading conditions, the strain-rate dependence of material causes the material response to differ significantly from that under quasi-static loading conditions. In this paper, a numerical investigation on the dynamic tensile behavior of cement-based materials. A gravitational split Hopkinson tension bar was used to characterize the dynamic tensile behavior of cement-based at high strain-rates. The commercial finite element software LS-Dyna is adopted to conduct the computations. The material specifications of cement-based are characterized by the Karagozian & Case (K&C) concrete model that accounts for shear dilation, strain-rate dependence, and strain softening. The model accuracy is verified with available experimental results in the form of strain signals, strain-rates, and tensile strengths. It was found that the results computed with the automatic generation version of K&C are slightly different from the experimental ones. Therefore, to achieve better agreement, the model was extended by calibrating a few parameters of the K&C material formulation. Finally, the simulation predictions were found to represent the experimental results with good agreement.

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Published

2023-07-26

Issue

Vol. 20 No. 8 (2023)

Section

Articles

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