Experimental Study On Division And Isolation And Packaging Containers Of Highly Toxic Dangerous Goods

In the process of transportation,the stress state of Tank containers'structures were changed in the event of external impact,hanging down,rollover.In severe cases,a large yield deformation occurred to the structures of tank containers.In this thesis,in order to improve the transport safety of the tank,the long-side drop stress tests and rollover stress tests were carried out on tank containers with two main connection structures,skirt and saddle.The stress states and the weak structures of the tank containers were analyzed under dropping.Based on the finite element software,the two types of tank containers were simulated and analyzed.The simulation results show that,in the long-side drop case or rollover case,the end beams of the two types of tank containers were bearing impacting load as the main structures.The end beams were subjected to yield and deformation,and close to the impact plate,the end beams were damaged badly.In the case of rollover,the yield deformation of the upper beam was worse than that of the lower end beam.The tank body and the frame structures of the tank containers were deformed and damaged.After the saddle-tank containers felled,the corner areas were yielded and deformed at both ends of the saddle bottom plate.The skirts were yielded and damaged after the skirt-type tank containers felled.In addition,the two types of structural forms of tank container specimens were produced to test for the long-side drop and rollover drop.The experimental results showed that the junction structures of tank and frame were damaged with withstanding large stress.The yield characteristics and position of the saddle bottom plate and the skirt of tanks were consistent with the simulation results,and the simulation results of finite element were verified.Compared with the results of the simulation analysis of the tank and the test results of the tank container,the deformation in connecting structures of the skirt and frame of skirt-type tank caused by force was smaller than that connecting structures of the saddle and frame of saddle-type tank.Indicating that the support structures of skirt-type tank container' tank were uniform force,the design is more reasonable.Through the drop test of the tank container specimen,it was found that the tank body of the saddle-type tank container collided with the impact plate due to the large deformation of the saddle floor.There were accidents showed that the pipeline,valves and other impact installed in the tank were likely to be damaged when the tank took place collision.In order to reduce the greater transient stress of the tank containers in the fall and to avoid damage of the tank and the valves,the design dimension of the end beams were increased and the triangular ribs were added at the frame.The simulation showed that the deformation of the tank was obviously reduced during the collision,and the safety of the tank was guaranteed.The experiments also were found that the tank specimens of saddle-type tank took flip over after the collision with the impact plate,and flip was fixed in the same direction.This indicated that the connection structures of the tank and the frame caused the tank container flipped under the unbalanced moments in the event of a collision.