Using an adjusted explosive welding technique, a Zr-2 alloy plate, a titanium plate and a carbon steel plate were cladded to form a three-layer composite panel which is difficult to manufacture by common methods. Microstructural evaluations reveal that a metallurgical bonding interface with wave morphology is realized, and the grains near the interface are smaller than grains in other areas. The microhardness of the sample near the interface is greatly higher than that of other areas. Furthermore, mechanical experimental evidence indicates the shearing strength of the interface in the moderate condition exceeds that of the interlayer plate.
The crew emergency evacuation security system is a life-saving device, the ultimate function of which is to save the life of the aircraft crew in a new regional airliner at high altitude. The system is used to push the service door with translational motion for a suitable distance. Before the system was started, the force state of the service door was got with the fluid mechanics knowledge. When the system was started, after a period of pressure relief time, the aircraft cabin pressure was calculated with the Bernoulli's Equation. The movement trajectory and the force state of the service door were obtained by the computational fluid dynamics theory and numerical simulation method. All of the above work must lay a theoretical foundation for the development of the crew emergency evacuation security system, and ensure the flight safety.
The finite element model of an aircraft hydraulic pipe was established in this paper. Based on LS-Dyna software equivalent static pressure and peak pressure surface loads on the tire burst test (main landing gear retracted state, and did not consider the impact of tire debris) jets were applied to the hydraulic pipe. Both stress and strain contours of hydraulic pipe were obtained under dynamic loading. Plastic strain occurred under both loads on the hydraulic pipe, and the peak pulse loads were more severe than equivalent static loads, the maximum strain reached 0.41172 under the peak pulse loads. However, in both cases the pipe is not broken.
In this study, a 316L stainless steel sheet and Q345R steel ribs are cladded to be a bimetallic ribbed panel which is hardly be manufactured by normal processing technique. There are three key sections in the fabrication process: the parallel arrangement, optimization of the explosive welding parameter and the template filling and stripping. The bonding interfaces of the ribbed panel are observed and analyzed by means of mechanical test and optical microscope (OM). It is found that welding interface is wavy, and the bonding strength is higher than that of base plate.
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