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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6 nm时最小;Ni层厚度由2 nm增至6 nm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。
In order to investigate the influence of Ni layer thickness on the thermal residual stress in Ni-CNTs / AZ91D reinforced Ni-CNTs / AZ91D coated with nickel carbon nanotubes, on the basis of experiments, the Ni-CNTs / AZ91D composites The finite element model is used to simulate the thermal residual stress distribution in Ni-CNTs / AZ91D composites. The results show that nickel on the surface of carbon nanotubes can significantly reduce the thermal residual stress in the Ni-CNTs / AZ91D composites. In the Ni-CNTs / AZ91D composites, the thermal residual stress is the smallest when the Ni layer thickness is 6 nm. When the Ni layer thickness is increased from 2 nm to 6 nm, the thermal residual stress decreases with the Ni layer thickness increasing. When Ni When the layer thickness exceeds 6 nm, the thermal residual stress increases with the increase of Ni layer thickness. The maximum thermal residual stress in the composites moves toward the interface between the Ni layer and the substrate as the Ni layer thickness increases on the surface of the CNTs.