Determination and numerical Validation of HJC constitutive model parameters for C30 concrete based on laboratory tests

Abstract

The Holmquist-Johnson-Cook constitutive model is widely adopted to analyze the dynamic response of concrete-like materials under impact and blast loading. In this study, a modified set of HJC constitutive parameters for C30 concrete was calibrated through a series of tests. Uniaxial compression tests were used to determine the uniaxial compressive strength and elastic parameters; conventional triaxial compression tests were performed to obtain the yield-surface parameters <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>A</mml:mi> </mml:math> , <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>B</mml:mi> </mml:math> , and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>N</mml:mi> </mml:math> ; uniaxial cyclic loading-unloading tests were conducted to determine the damage parameters <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mrow> <mml:mi>D</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>1</mml:mn> </mml:mrow> </mml:msub> </mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mrow> <mml:mi>D</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msub> </mml:math> ; and split Hopkinson pressure bar (SHPB) tests were carried out to identify the strain-rate parameter <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>C</mml:mi> </mml:math> . Numerical validation was conducted using a finite element model of the SHPB test. The results demonstrate that the proposed HJC model parameters can effectively represent the dynamic mechanical behavior of C30 concrete under impact loading at low-to-medium strain rates. Both the stress-strain curves and failure modes derived from numerical simulations agree well with the experimental observations. These findings can provide reference for the impact- and blast-resistant design of concrete structures.