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通过SiCp/A356颗粒增强复合材料切口试样在20℃~300℃循环下的热疲劳试验,获得热疲劳裂纹形成寿命与试样切口半径及厚度等几何尺寸的关系。采用热弹塑性有限元法模拟热疲劳试验中试样切口根部的应力-应变响应,进而揭示出残余应力形成机制。结合热疲劳试验的裂纹形成寿命与有限元模拟的应力-应变响应,建立起考虑平均应力影响的热疲劳应变寿命曲线,为高速列车SiCp/A356颗粒增强复合材料制动盘的热疲劳性能评价提供依据。
Through the thermal fatigue test of SiCp / A356 particle reinforced composite notch specimens at 20 ℃ ~ 300 ℃ cycles, the relationship between the thermal fatigue crack initiation life and the geometry of the specimen notch radius and thickness was obtained. The thermo-elasto-plastic finite element method was used to simulate the stress-strain response at the root of notch in the thermal fatigue test, which revealed the formation mechanism of residual stress. Combined with the fatigue life and the stress-strain response of the finite element simulation, the thermal fatigue strain life curve considering the influence of average stress is established, which provides a basis for evaluating the thermal fatigue performance of the SiCp / A356 particle-reinforced composite brake disc in accordance with.