内爆载荷下民机用定向泄爆容器结构的动态响应

The dynamic response of the directional blast relief container structure for civil aircraft under different TNT equivalent internal explosive impact is studied. A directional blast relief container for civil aircraft is designed to remove the explosive hazards in civil aircraft. Through the explosion test, the reliability of the blast relief container is verified, and the explosive critical inclusive equivalent of blast relief container is determined to be 42 g. The dynamic response of blast relief container under different equivalent internal explosive loads is numerically simulated, and the motion process of a stopper and the mechanism of action of internal explosive load on the blast relief container are analyzed. The results show that the shear pin is shearing broke under the action of the explosion shock wave, and the stopper vibrates in shearing process; after shear pin is sheared, the stopper continuously accelerates, and about 7郾 5 MPa quasi鄄static pressure is finally generated in the container. The stopper flys out at a uniform speed after it breaks through the fuselage bulkhead. The container relieves pressure, and a pressure gradient of about 0郾 38 ~ 0郾 85 MPa is formed inward from the explosion vent. The TNT equivalent has a significant effect on the stopper flight speed. The flight speed of stopper increases and the rate of increase decreases with the increase in TNT equivalent. The study provides support for the design and application of explosion鄄proof containers for civil aircrafts.