摘要:为研究动车组铸钢制动盘出现裂纹后裂纹扩展速率和扩展寿命,根据制动盘材料参数,使用 ANSYS 软件建立制动盘 的循环对称三维瞬态计算模型,采用间接耦合方法计算制动盘的温度场和应力场,得到在动车组速度为 300 km/h 的工况下, 裂纹处的温度为 355.33 ℃。以温度计算结果作为初始载荷计算制动盘热应力,制动盘最大热应力为 899 MPa,盘面裂纹处 的应力为 501 MPa。并将计算结果作为计算制动盘的载荷输入到 NASGRO 中,对裂纹扩展速率和扩展寿命进行计算和分析。 计算和分析结果表明,此材料制动盘径向裂纹长度尖端处的应力强度因子和扩展速率均高于深度尖端处;计算得出制动盘裂 纹扩展寿命为制动 48 831 次,为该制动盘的使用提供参考。 关键词:制动盘;裂纹扩展寿命;热应力;应力强度因子;NASGRO 中图分类号:U270 Abstract:In order to study the extended life of the cast steel brake disk of EMU, a-rotationally symmetrical 3D transient

more »

... lculation model is established for brake disc. According to the material parameters of the cast steel material of the EMU, finite element analysis software ANSYS is utilized and indirect coupling method is adopted to simulate the instantaneous temperature filed and thermal-stress distribution produced by frictional heat load of brake disk. The calculated results are used as loads which are input into the NASGRO to analyze and calculate the crack propagation rate and the extended life. The simulation result illustrates that the stress intensity factor and crack growth rate at the tip of the radial crack length of the brake disc is higher than that at the tip of the depth; It is calculated that the crack propagation life of brake disc is 48 831 times. It provids a valuable reference for the use of the brake disc. Key words:brake disc;crack propagation life;thermal stress;stress intensity factor;NASGRO