ZTA_p/Fe45复合材料冲击性能的数值模拟与实验验证

Numerical simulation and experimental validation of the impact properties of ZTA_p/Fe45 composite

陶瓷颗粒的尺寸和含量对增强金属基复合材料的力学性能具有重要影响。实验室常采用摆锤冲击试验的方法研究陶瓷颗粒的尺寸和含量对复合材料冲击力学性能的作用规律。本文采用有限元数值模拟和实验相结合的方法,针对氧化锆增韧氧化铝颗粒(ZTA_p)的尺寸以及颗粒尺寸级配效应对ZTA_p/Fe45复合材料冲击力学性能的影响进行了研究,并将模拟与实验结果进行了对比分析。结果表明:在二维情况下,模拟得到的ZTA_p/Fe45复合材料的破坏形式和断裂区域的形貌与实验结果吻合较好。不考虑ZTA颗粒与基体之间的界面结合以及基体内部的缺陷时,模拟结果与实验得到的ZTA_p/Fe45复合材料冲击吸收功将存在差异。

The size and content of the ceramic particles have a significant impact on the mechanical properties of ceramic particle reinforced metal matrix composites. To study the effect of size and content of the ceramic particles on the impact mechanical properties of the composites,Charpy impact tests are commonly used. In this paper,the size and size-fractionation effects of the ZTA particles on the impact mechanical properties of ZTA_p/Fe45 composites were investigated by means of both finite element simulation and experiment methods,and the simulated and experimental results were compared and analyzed. The results show that the simulated failure modes and the morphology of the fracture zone of the two dimension ZTA_p/Fe45 composites model match well with the experimental data. Without consideration of the interfacial bonding properties between the ZTA particles and the defects in matrix result in a discrepancy between the simulated and experimental impact absorbed energy of the ZTA_p/Fe45 composites.