采用威布尔分布的道岔梁的寿命预测及评估

由于跨座式单轨车辆行驶的道岔梁受循环动载荷作用时会在局部产生裂纹,循环作用的应力或应变作用次数积累后,焊缝脆弱区会产生疲劳断裂,故文中借助有限元理论和疲劳损伤累计理论对道岔梁进行寿命预测.基于静态叠加法,借助多体动力学软件ADAMS,建立动力学仿真模型并获取载荷谱;在有限元软件中获得单位载荷下的应力-应变结果,并利用疲劳分析软件Femfat对焊缝进行建模,定义其接头类型,进行仿真计算.结合实际运行工况对焊缝进行寿命预测,结果表明:在极限工况下,焊缝疲劳强度能满足实际工况的运营需求.

Life Prediction and Evaluation of Turnout Beam Using Weibull Distribution

When the turnout beam of a straddle-type monorail vehicle is subjected to cyclic dynamic loads, cracks will occur locally. After the accumulation of cyclic stress or strain, fatigue fracture will occur in the vulnerable area of the welds. With the help of finite element theory and cumulative fatigue damage theory, the service life of turnout beam was predicted. Based on static superposition method, with the help of multi-body dynamics software ADAMS, a dynamic simulation model was established and the load spectrum was obtained; the stress and strain results under unit load were obtained in the finite element software; the fatigue analysis software Femfat was used to model the welds, define their joint types, and perform simulation calculations. The actual operating conditions were combined to predict the life of the welds. The results show that the fatigue strength of the welds can meet the operating requirements of the actual operating conditions under extreme conditions.