Dynamic Response of Narce-Like Brick and Mortar Structure under Impact Load

As a typical impact resistant bio-material, shell shows excellent properties such as light weight, high strength and high toughness. In this paper, the finite element model of nacre-like brick and mortar structure is constructed and its dynamic response under the impact load of drop hammer is numerically simulated. The effects of the number of stacked layers, impact velocity and hammer type on the energy absorption performance of nacre-like brick and mortar structure are analyzed. The results show that the specific energy absorption of nacre-like brick and mortar structures under the five types of stacked layers increases first and then decreases; and the three-layer nacre-like brick and mortar structure has the largest ratio among the five types of stacked layer structures designed, the value of the specific energy absorption is increased by 10.8% compared with the single-layer structure. With the increase of impact velocity, the peak load and energy absorption of the structure increase slightly. Under the same hammer diameter, the cylindrical hammer is easier to penetrate the model than the hemispherical hammer.