Finite element analysis of thermal residual stresses in magnesium matrix composite reinforced by carbon nanotubes
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摘要: 为了探寻Ni层厚度对镀镍碳纳米管增强AZ91D镁基复合材料(Ni-CNTs/AZ91D)中热残余应力的影响, 在实验基础上, 建立不同Ni层厚度时Ni-CNTs/AZ91D复合材料的有限元模型, 模拟了Ni-CNTs/AZ91D复合材料中热残余应力的分布。研究发现: 在碳纳米管表面镀镍能够明显降低Ni-CNTs/AZ91D复合材料中的热残余应力。Ni-CNTs/AZ91D复合材料中, 热残余应力在Ni层厚度为6nm时最小; Ni层厚度由2nm增至6nm时, 热残余应力随着Ni层厚度的增加而减小; 当Ni层厚度超过6 nm时热残余应力随着Ni层厚度的增加而增大。复合材料中热残余应力的最大值随碳纳米管表面Ni层厚度的增加向Ni层与基体的界面移动。Abstract: In order to explore the influence of Ni-coating thickness on the thermal residual stress in AZ91D magnesium matrix composite reinforced with Ni coated carbon nanotubes(Ni-CNTs/AZ91D), the distribution of the thermal residual stresses in Ni-CNTs/AZ91D composite was simulated by using finite element method(FEM)based on some experiments. The results indicate that plating Ni on CNTs’surface can greatly reduce the thermal residual stress of Ni-CNTs/AZ91D. For the Ni-CNTs/AZ91D composite materials, the thermal residual stress achieves the minimum at the thickness of Ni-coating is 6nm. While the thickness of Ni-coating is varying from 2nm to 6nm, the thermal residual stress is diminished with the increase of the thickness of Ni-coating. Once the thickness of Ni-coating is larger than 6nm, the thermal residual stress increases with increasing the thickness of Ni-coating. Moreover, the location of thermal residual stress’s maximum moves toward the interface of Ni-coating and substrate with increasing of the thickness of Ni-coating.
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