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由于增强相颗粒和基体间热膨胀系数(CTE)存在差异,颗粒增强铁基复合材料在其制备和热处理过程中,会在颗粒和基体的边界结合处产生热残余应力。利用单颗粒增强轴对称单胞模型,针对不同形状的增强相颗粒,在ANSYS软件中了进行热-结构耦合分析,模拟了不同颗粒形状的单胞模型的热残余应力场。结果表明:立方形颗粒由于尖角的存在,使其模型中产生极端应力集中现象应力,椭球颗粒能缓解应力集中现象,球形颗粒模型的应力分布均匀。
Due to the difference in coefficient of thermal expansion (CTE) between the reinforcing phase particles and the matrix, the particulate reinforced iron-based composite generates thermal residual stresses at the grain boundaries and the boundary of the matrix during its preparation and heat treatment. In this paper, a single-particle-enhanced axial symmetric unit cell model is used to simulate the thermal residual stress field of single-cell model with different particle shapes. The results show that due to the existence of sharp corners, cubic particles cause extreme stress concentration stress in the model. Ellipsoid particles can ease the stress concentration and the stress distribution of the spherical particle model is uniform.