焊接结构虚拟疲劳试验技术研究

Experimental technology study on the virtual fatigue of welded structure

针对焊接结构的疲劳问题,提出虚拟疲劳试验技术。基于有限元数值仿真技术及焊接接头S-N曲线数据库,在计算机中模拟物理样机的疲劳试验过程,预测焊接结构的疲劳寿命,使产品在设计阶段开展抗疲劳设计成为可能。虚拟疲劳试验在铁路车辆焊接摇枕上的应用验证了该技术的可行性。

An experimental technology of virtual fatigue was put forward directed against the fatigue problems of welded structure. On the basis of finite element numerical simulation technology and S-N curve data base of welded joint, the course of fatigue test of physical prototype was simulated with computer and the fatigue life of welded structure was predicted, so as to let the development of anti-fatigue design becoming possible in the designing stage of product. The feasibility of this technology was verified by the application of the virtual fatigue test to the welded bolster of railway vehicle.