Experimental and numerical investigations of single‐hole blast‐induced cracks in concrete based on a calibrated RHT model

The RHT model is commonly used in the numerical calculation for structural dynamic failure. The accuracy of the numerical results obtained from the RHT model is significantly influenced by the model's parameters. However, the RHT model has many parameters, including 34 parameters in total. Therefore, numerous researchers tend to use the default RHT parameters in the LS‐DYNA user manual for simulations and do not calibrate parameters based on actual research objects. This paper aims to accurately calibrate four categories of parameters related to the concrete RHT model based on the basic mechanical parameters of concrete obtained through a quasi‐static compression experiment. Then, based on the experiment of the single‐hole blast‐induced cracks in concrete, a calibrated RHT model is implemented to predict the experimental results. The final crack morphology observed in the concrete specimens exhibited a general consistency with the simulation results. The specimens exhibited a division into three distinct zones: a crushing zone, a tensile shear failure zone, and an elastic vibration zone. The empirical formula proposed by Hino demonstrated a satisfactory ability to describe the trend of peak pressure change at different radius positions. However, the predicted value exhibited a slight discrepancy with the real value, while the simulated value aligned more closely with the experimental value. The comparison between experimental and simulated results indicates that the calibrated RHT model can well reproduce the crack morphology and pressure distribution in concrete under blasting load. This study provides a theoretical basis and technical guidance for the calibration of the RHT model and the simulation of blast‐induced cracks in concrete.