高速客车制动盘材料SiCp/A356细观热疲劳仿真  

Microcosmic Thermal Fatigue Simulation of SiCp/A356 Brake Disc Material for High Speed Train

作　　者：杨月[1] 谢基龙[1] 王文静[1] 

机构地区：[1]北京交通大学机械与电子控制工程学院,北京100044

出　　处：《北京交通大学学报》2007年第1期11-13,17,共4页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：国家"863"项目(2003AA331190)

摘　　要：采用三维有限元方法模拟高速客车制动盘的非连续SiC颗粒增强铝基复合材料体元的循环热应力应变场.并按球对称模型,对颗粒增强复合材料中热膨胀差(DCTE)热应力进行了弹塑性有限元分析.探讨了颗粒增强铝基复合材料发生晶界分离失效的形成机理.证明了温度达到最大时,界面结合处产生热压应力;而在温度冷却至室温时,产生热拉应力,而一般认为压应力对疲劳损伤没有影响,因此,可将循环热疲劳过程简化为某一恒温下的疲劳过程.The cycling thermal stress-strain field of non-continuum SiC particle reinforced aluminium matrix composites （AMC） was simulated by using 3D finite element method, and this material will be used in the brake disc of bullet train. The elasto-plastic finite element analysis of thermal expansion difference thermal-stress of AMC was conducted by sphere symmetry model. In the end, this article put forward the formation mechanism of grain-boundary separation or intercrystalline cracking. It is found that thermal compressive stress exists at the interface when the temperature reached the highest point, while thermal tensile stress exists at the lowest point. And it is commonly considered that compressive stress has no effect on fatigue damage. Therefore, cycling thermal fatigue analysis can be simplified as a constant temperature fatigue process.

关 键 词：颗粒增强复合材料 循环热应力应变场 弹塑性有限元分析 

分 类 号：TG156.4[金属学及工艺—热处理]