热残余应力对颗粒增强镁基复合材料力学性能影响

发布时间：2018-05-23 15:41

本文选题：PRMMCs + 力学性能　；参考：《中北大学》2015年硕士论文

【摘要】：颗粒增强复合材料(PRMMCs)中增强相与基体相间热膨胀系数的巨大差异导致了复合材料内部产生热残余应力,而这个热残余应力导致复合材料的压缩屈服强度高于拉伸屈服强度,并且使得复合材料的比例极限接近或略低于单一基体合金。因此热残余应力导致的颗粒增强复合材料力学性能的改变必须加以研究。本文以颗粒增强金属基复合材料为研究对象,介绍了复合材料基体和增强相间热膨胀系数的差异,说明了热残余应力产生的过程,并计算这种残余应力对复合材料力学性能的影响。进行必要的有限元计算,分别施加静态和动态载荷,比较热残余应力对PRMMCs静态及动态力学性能的影响。通过PRMMCs热残余应力模拟实验,了解复合材料内部在不同外载荷下的变形特点。希望通过对热残余应力的分析,为颗粒增强镁基复合材料力学分析提供一定程度的指导。
[Abstract]:The significant difference in the thermal expansion coefficient between the reinforced phase and the matrix in the particle reinforced composite (PRMMCs) leads to the thermal residual stress in the composite, which leads to the compressive yield strength of the composite higher than the tensile yield strength, and the ratio limit of the composite material is close to or slightly lower than that of the single matrix. Therefore, the change of mechanical properties of particle reinforced composites caused by thermal residual stress must be studied.
In this paper, the particle reinforced metal matrix composites are taken as the research object. The difference between the matrix and the thermal expansion coefficient of the reinforced phase is introduced. The process of the thermal residual stress is explained and the influence of the residual stress on the mechanical properties of the composite is calculated. The influence of thermal residual stress on static and dynamic mechanical properties of PRMMCs.
Through the PRMMCs thermal residual stress simulation experiment, the deformation characteristics of the composite under different external loads are understood. It is hoped that the analysis of the thermal residual stress can provide some guidance for the mechanical analysis of the particle reinforced magnesium matrix composites.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB333

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