Nonlinear topological optimization method for car body welding spot arrangement

Abstract

The invention discloses a nonlinear topological optimization method for car body welding spot arrangement. The method comprises the steps that a vehicle crash simulation finite element model is established, LS-DYNA calculation is submitted, and displacement values of crash performance key attention nodes are output; a white car body linear rigidity simulation finite element model is established, and GENESIS optimizing calculation is submitted; entity units are adopted for modeling of relevant welding spots in a crash model and a white car body model; an equivalent static load method is adopted for transforming crash nonlinear conditions into linear static conditions for topological optimization design; the welding spots are set to be topological variables, obtained welding spot density values are updated into the crash finite element model, and a new round of crash simulation analysis is conducted; lastly, a convergence result is postprocessed. According to the method, the entity welding spots are subjected to topological optimization, car body welding spot arrangement is realized on the premise that crash properties at all important moments are met, reasonability of car body welding spot arrangement is ensued, redundant welding spot arrangement is avoided, the number of the welding spots is reduced, manufacturing cost is lowered, and production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of optimal design of solder joints of automobile bodies, and in particular relates to a nonlinear topology optimization method for solder joints of automobile collision simulation. Background technique [0002] The development of the car body needs to take into account the rigidity, strength, collision safety and other performances. The car body is a welded structure, and the thin plate stamping parts are assembled together by welding. The number and layout of welds have a significant impact on the structural performance and manufacturing cost of the car body. In the prior art, the total number of solder joints in the traditional car body is 5,000-6,000, and the solder joint layout scheme is often designed based on experience, but designing based on experience may lead to too many solder joints in some areas, increasing manufacturing costs; or other The number of welds in some areas is too low, affecting th...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the deficiencies in the prior art, aiming at the problem that the current automobile body welding spot arrangement cannot take into account the collision nonlinear working conditions, and propose a nonlinear topology optimization of the body welding spot based on the equivalent static load theory The method, which equivalently or maps the collision load force to the linear optimization model, performs the topology optimization design of the solder joints, guides the optimization of the solder joint layout, identifies important solder joints and non-important solder joints, and realizes the optimal layout of the body solder joints