Numerical Modeling of Concrete Spallation at Medium Strain-rate

Ammar  Babiker; Ulrich  Häussler-Combe; Aamir  Dean; Salih  E. M. Ahmmed; Elsadig  Mahdi

doi:10.52981/fjes.v9i1.667

Ammar Babiker Institute of Concrete Structures, Technische Universität Dresden
Ulrich Häussler-Combe Institute of Concrete Structures, Technische Universität Dresden
Aamir Dean Institute of Structural Analysis, Leibniz University Hannover
Salih E. M. Ahmmed Department of Civil Enginering, College of Engineering, Sudan University of Science and Technology
Elsadig Mahdi Department of Mechanical and Industrial Engineering, College of Engineering, Qatar University

DOI: https://doi.org/10.52981/fjes.v9i1.667

Keywords: Concrete, Strain-rate, Spallation, Modified Split-Hopkinson-Bar, Dynamic tensile strength, DIF.

Abstract

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.

Numerical Modeling of Concrete Spallation at Medium Strain-rate

Abstract

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