Open AccessNumerical Modeling of Concrete Spallation at Medium Strain-rate
Author(s) -
Ammar Babiker,
Ulrich HäußlerCombe,
Aamir Dean,
Salih E. M. Ahmmed,
E. Mahdi
Publication year - 2021
Language(s) - English
Resource type - Journals
ISSN - 1858-7313
DOI - 10.52981/fjes.v9i1.667
Subject(s) - spall , ultimate tensile strength , strain rate , materials science , brittleness , split hopkinson pressure bar , spallation , structural engineering , composite material , finite element method , bar (unit) , tensile testing , dynamic loading , engineering , meteorology , physics , quantum mechanics , neutron
Dynamic tensile strength of brittle materials such as concrete is usually obtained by performing laboratory investigations such as direct tensile, Brazilian splitting, and spall tests. This research presents a study aimed to investigate numerically the dynamic behavior of concrete exposed to tensile loading at medium strain-rate. The dynamic tensile behavior of concrete is investigated using the Modified Split Hopkinson Bar (MSHB) at strain-rate ranges from 33 to 80 s-1. The commercial finite element explicit code LS-DYNA is used to perform the numerical simulations of the MSHB tests. Karagozian & Case Concrete Model (K&C) is adopted to define the mechanical properties of the investigated specimens. The employed K&C material model is verified by using the experimental results obtained in [1]. The validation of the K&C material model is carried out with the comparison of the computed and experimental pull-back velocities of the specimens free end. The results of the analysis are used to enhance the understanding of strain-rate sensitivity of the concrete tensile strength.