| According to the existing problem of bearing structures’local buckling and passenger zones’larger plastic deformation at collision event for stainless steel vehicle of the spot-welding structure, this paper takes the stainless steel spot-welding structure of B-type metro car body as the research object and analyzes its stiffness, static strength, fatigue strength, the structure stability and crashworthiness. The main content is as follows: First, design loads of different types of railway vehicles at the design stage are summarized, and indicators of vehicle performance,such as stiffness, strength, stability, crashworthiness, are given under such design loads in the relevant standards; Combined with spot-welding car body structure feature, FEM-building method of the body including the solder joints and transfer mode of FEM data files between the software which are used to establish and analyze model are expounded.Second, according to the3D geometric models and related welding drawings provided by the factory, it establishes the finite element simulation model of stainless steel spot welding structure of B-type metro car body. And then analyze the static strength and fatigue strength on the body respectively, which complies with static and dynamic design loads supplied by EN12663-2000standard and relevant parameters of the fatigue properties for different levels welded joints in BS7608:1993standard. At the same time, the weak parts of the car body are optimized design after simulation analysis and meet the strength requirements eventually.Third, based on the basic principle of linear buckling analysis, the body parts before the order of buckling factors less than1.5are the side wall under windows after analysis of structural stability which is compressed by the action offeree800KN. In order to study how to improve the buckling factors of instability parts by means of ameliorating the solder joint distribution, introducing the sub-structure technology, topology optimization design for solder joint layout to the side wall under windows is carried out. The optimal solder joint layout programs is selected according to the optimization results and the requirements of welding technology and the buckling factors of instability parts are increased to more than1.5finally.Forth, the key points of complex structure of the vehicle for the crash simulation analysis are summed up, and based on which, the crash simulation model of stainless steel spot-welding structure of B-type metro car body is established. And then analyze the deformation of body at different times and the acceleration variation of different parts when the body impacts a rigid wall at23.5km/h speed. Meanwhile, give curves over time of energy and impacting force on a collision course. According to larger plastic deformation of the passenger area, the front-end energy-absorbing structures and local carbon steel side beams are optimized, which improve the body’s front-end energy-absorbing and decrease the plastic deformation of the local side beams, floors and columns in the passenger area. |
PDF Full Text Request