Method for evaluating crashworthiness of welding structure based on explicit-implicit continuous solving

Abstract

The invention relates to a method for evaluating the crashworthiness of a welding structure. The method is characterized by comprising the following steps: dividing finite element grids of a train body; longitudinally loading the train body so as to actually measuring or calculating a rigidity value and damping value of each node; carrying out computer simulation on a hot machine coupled welding structure, simulating a residual stress field of each welding line by virtue of an actual welding temperature field, or simulating an actual welding temperature field to actually measuring residual stress field of each welding line as an initial load of each node; loading the train body, carrying out crash test or computer simulation at a certain speed, and continuously solving based on explicit-implicit loads; and evaluating the energy flow of a train head welding structure, actually measuring the plastic deformation of a train head, or carrying out computer simulation, if the plastic deformation exceeds a failure set value, determining that the crashworthiness is insufficient, and otherwise, determining that the crashworthiness is qualified. The method is applied to a typical local welding structure of a high-speed train body, and an evaluation result is relatively true, objective and reliable.

Description

technical field [0001] The invention relates to a method for evaluating the crashworthiness of a welded structure, which is applied to a typical local welded structure of a high-speed train car body, and considers the influence of the welding residual stress field through technical means, so that the evaluation result is more real, more objective and more reliable . Background technique [0002] Crashworthiness analysis is one of the important tasks in the safety optimization design of rail train car bodies. The car body structure is welded by large aluminum alloy profiles. The existence of welding residual stress reduces the strength and stiffness of the welding position and nearby units. The time for the material to reach the failure stress is changed, thereby changing the time and mode of each structure participating in the deformation and energy absorption, and increasing the difficulty of optimizing the crashworthiness design of the car body. The research on the collis...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for evaluating the crashworthiness of a welded structure, which applies the welding residual stress analysis method to a typical local welded structure of a high-speed train car body, and can obtain the physical nature and distribution rules of welding stress and deformation, Using the implicit-explicit continuous solution method can improve the gap between the simulation results and the actual structural damage caused by the strength and rigidity of the solder joint position, and can further study the bearing capacity of the structure with the initial complex stress state to improve the structural space shape. Quality and Safety Bearing Performance

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