关键词: 车身覆盖件, 点焊, 虚拟节点, 模态分析, 建模

Abstract: In order to investigate the problem on how a large number of spot-weld models can be established efficiently and how the positional precision of spot-welds can be ensured, virtual-node method was presented to simulate welding spots. In this method, firstly, a reference point established in the real location of the welding spot was projected onto two welding planes along their normal directions to obtain two virtual nodes; the welding element was composed of such a pair of virtual nodes, and a short beam element connecting the two virtual nodes was introduced to simulate the welding relation. Secondly, the distributive coupling constraints were built between each virtual node and the surrounding nodes on the surface in its immediate neighborhood, and then the motion of the virtual node was coupled to the motion of the nodes in this region by the constraints. The results showed the virtual-node method had a good accordance with the experimental results, and the mechanical property of the real welding spots could be more effectively simulated than the traditional method. It proved of the feasibility of the virtual-node method in effectively simulating welding spots.

Key words: automotive panel, spot weld, virtual node, modal analysis, modeling