Rigid-flexible coupling response analysis of mortar and soil under dynamic load

Abstract

In the live firing of mortar, the base plate is generally constructed at an angle of about 20° with the horizontal ground, so as to make the base plate more stable and improve the shooting accuracy. In order to explore the optimal matching angle between barrel and plate in live firing, a rigid-flexible coupling finite element model of a certain 82 mm mortar and soil is established. The dynamic response of launching is analyzed based on explicit solver under six working conditions with no. 4 charge, angle of fire 50°, angle of fire 60°, plate and horizontal ground 10°, 20° and 30° respectively. The relative change curves of the angle of firing of the first round of mortar under six conditions are obtained. It is found that when other firing conditions are consistent, the closer the angle between the plate and the barrel is to 90°, the smaller the relative change of the firing angle of the mortar is. When the angle between the plate and the barrel is to 90°, the relative change of the firing angle also reaches the minimum value, and the firing accuracy is the highest. The research results have reference value for the reliable use of mortars, the study of launch dynamic response and the design of related auxiliary devices.

Keywords

• mortar|soil|rigid-flexible coupling|explicit dynamics|dynamic response