Stress distribution in particulate-reinforced metal-matrix composites subjected to external load
Stress distribution in particulate-reinforced metal-matrix composites subjected to external load
复制标题
DOI：
10.1007/bf02669616
复制
发表时间：
1993
期刊：
影响因子：
--
通讯作者：
Zhirui Wang;Tzikang Chen;D. Lloyd
中科院分区：
文献类型：
--
作者：
Zhirui Wang;Tzikang Chen;D. Lloyd
采用有限元方法研究了颗粒sic增强Al金属基复合材料（MMCs）在外加载荷作用下的应力分布。结果表明，除了钢筋长径比的影响外，铸造过程中产生的颗粒分布和聚类行为也是造成材料应力分布不均匀的重要原因。颗粒周围或颗粒团簇内部的三轴应力状态会改变von Mises应力，从而产生应变局部化等塑性变形特征。此外，发现颗粒分布与外载荷的相对方向对应力分布有重要影响。随着外加应力的增加，团簇内的三轴应力状态促进了颗粒的早期开裂、界面脱粘和延性基体中空洞的形成。压缩试验中滑移带分布等特征的实验观测与计算结果吻合较好。
Finite element calculations were carried out to study the stress distribution in particulate SiC-reinforced Al metal-matrix composites (MMCs) subjected to external load. The results showed that, in addition to the effect of the aspect ratio of the reinforcement, particle distribution and grouping behavior-clustering, resulting from the casting process in the present materials, also contribute considerably to the nonuniform stress distribution in the material. The triaxial stress state around a particle or inside a particle cluster may change the von Mises stress and result in plastic deformation features, such as strain localization. Furthermore, the relative orientation of the particle distribution to the external load was found to be important to the stress distribution. As the applied stress increases, the state of triaxial stress inside a cluster appears to promote the early particle cracking, interface debonding, and void formation in the ductile matrix. Experimental observations of slip band distribution and other features in compression tests are consistent with the calculated results.