Determination and evaluation of Holmquist-Johnson-Cook constitutive model parameters for ultra-high-performance concrete with steel fibers

• Published in: International journal of impact engineering Vol. 156; p. 103966
• Main Authors: Wan, Wenzheng, Yang, Jian, Xu, Guoji, Liu, Yikang
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01-10-2021; Elsevier BV
• Subjects: Blast loads; Blast resistance; Bullet penetration; Calibration; Concrete; Constitutive models; Contact explosion; Explosions; Finite element method; HJC model; Impact resistance; Mathematical models; Parameter calibration; Parameters; Simulation; Split Hopkinson pressure bars; Steel fibers; Triaxial tests; UHPC; Ultra high performance concrete; UHPC; Bullet penetration; Contact explosion; Parameter calibration; HJC model
• ISSN: 0734-743X; 1879-3509
• DOI: 10.1016/j.ijimpeng.2021.103966

•Key parameters of HJC constitutive model for UHPC with steel fibers are determined.•These parameters are comprehensively calibrated based on existing test data.•The contact explosion and bullet penetration tests are involved for verification purpose.
Ultra-high performance concrete (UHPC) features with exceedingly high strength and fracture energy, and thus is regarded as a promising structural material to resist impact and blast loadings. Particularly, adding steel fibers can significantly enhance the impact resistance of UHPC. To facilitate the simulation of the behavior of UHPC structures with various steel fiber ratios against extreme loadings, selecting an appropriate constitutive model and determining its parameters should be highly emphasized. The Holmquist-Johnson-Cook (HJC) model is widely used in the simulation of the conventional concrete subjected to impact and explosion, whereas there are rare studies on calibrating the parameters of the HJC model for UHPC. In this study, a set of HJC model parameters for UHPC with considering the volume ratio of steel fiber ranging from 0% to 3% were firstly determined based on existing test data, originating from the Split-Hopkinson pressure bar (SHPB) test, triaxial test, uniaxial loading test, and Hugoniot test. To verify the correctness of the calibrated parameters of HJC model, UHPC slabs under the contact explosion condition were then tested, and a finite element model (FEM) with the calibrated parameters implemented was thereby established to reproduce this experiment numerically. Finally, the existing bullet penetration experiment was also verified with the numerical procedure. The results show that finite element simulations by employing the HJC model with calibrated parameters agree well with the experiments. The successful applications and evaluation of the HJC model with calibrated parameters in this work can provide guidance in simulating the behavior of UHPC with certain prescribed steel fiber ratio subjected to the impact and blast loading.