高冲击下含预制损伤金属膜的损伤模式及响应机理OA

The damage pattern of metal diaphragms containing prefabricated damage under high impact has a direct impact on the ability of the secondary light air cannon to achieve high impact effects.In this paper,based on the secondary light air cannon experimental device,the Coupled Euler-Lagrange(CEL)method was used to numerically simulate the action of blast shock wave on the metal diaphragm contain-ing prefabricated damage,and different structural forms of the diaphragm were designed by controlling the groove depth and groove length of the metal diaphragm,and the damage forms of the diaphragm of differ-ent structures under the action of the blast shock load and laws of bullet movement were explored.The study shows that with the increase of the groove depth,metal diaphragms with prefabricated damage are more prone to fracture and perforation.At the same time,the bullet velocity,acceleration,and displace-ment are increased.Groove length presents two different effects,when groove length is smaller,the dia-phragm's fracture failure is concentrated in a smaller hole,the shock wave in a more concentrated way through the diaphragm,so that the dynamic performance of the bullet is better;when groove length is larger,the fracture and perforation of the diaphragm is easier,and the dynamic response of the bullet is enhanced,which is better than the case of small groove length.