The honeycomb core layer is light and has the advantage of high specific stiffness, specific strength and specific energy absorption. A novel prefabricated wall panel structure for substations was designed by combining fiber-reinforced concrete panels, honeycomb core layers, and aluminum alloy panels. The dynamic response of the structure under the blast load was investigated, as well as the effect of the explosive mass and the size of the honeycomb core. In this paper, a finite element model was established and compared with the experimental results, which was found to be in good agreement with each other, thus validating the model. On this basis, the effects of explosive mass and honeycomb core layer on the structural deformation failure mode, midpoint deflection of back panel and energy absorption were investigated. It is shown that the deformation pattern of the structure is mainly concave at the front and convex at the back, and the honeycomb core layer is compressed, resulting in the whole deformation. Then the fiber cement of the front panel is separated with the honeycomb core layer, and the fiber-reinforced concrete panels of the back panel have failure at the center and diagonal, and the crack expandes, and the compression of the core layer increases. It was found that for the same amount of explosion, the center deflection of the back panel of the honeycomb structure with small size was reduced by 18.5%, 17.1%, and 18.1% compared to the honeycomb structure with large size. Meanwhile, the energy absorption of the honeycomb structure with small size was increased by 7.8%, 6.7%, and 2.2% respectively compared with that of the honeycomb structure with large size. Thus, the honeycomb structure with small size has better impact resistance. Under blast load, the fiber-reinforced concrete panels on the front panel absorbs the most energy, accounting for more than 50%, followed by the honeycomb core layer, accounting for about 45%, and the back panel fiber-reinforced concrete panels absorbs less energy, and the energy absorption is within 5%.

In military operations, industrial accidents and other explosive events, head injuries caused by blast shock waves have become one of the main injury forms of injury, but the injury mechanism and damage threshold have not been clarified yet. In this paper, numerical simulation is used to study the dynamic response process of the head under explosion load, and the effects of TNT charge, air and water media on the deformation, pressure and acceleration of the cranium and brain are analyzed. First, the air-head fluid-structure interaction model is established using Euler-Lagrangian coupling method. Based on the validation of its effectiveness, the dynamic response process of the head was analyzed in terms of pressure, acceleration and frequency of the prefrontal cranium and brain tissue. By setting the initial conditions and boundary conditions, the effects of frontal and the behind shock loadings of the blast wave on the head were simulated. It has been found that the head tissue vibrates at high frequencies, up to 7 kHz, when the blast wave strikes the head directly. The acceleration on the prefrontal cranium and brain tissue had a large value initially and become small in the late stage, while the intracranial pressure varied in a cyclical manner. In the underwater environment, there were high-frequency periodic overpressure fluctuations in the brain tissues of frontal, parietal and temporal lobes, in which peak overpressure of 3.64 MPa can be generated in the prefrontal cranium, which is well above the threshold of 235 kPa for severe brain injury. In water, brain tissue is subjected to 5 times the peak pressure, a 5 fold increase in acceleration and a 2 fold increase in frequency compared to those in air. The results of this research provide a new perspective for understanding the mechanism of damage to the human brain caused by blast shock waves, and an reference for the development of future protective measures.