扭转载荷作用下熔接涂层与基体结合界面处应力特性仿真研究

发布时间：2018-04-10 04:15

本文选题：扭转载荷　切入点：镍基合金涂层　出处：《表面技术》2017年01期

【摘要】：目的通过有限元仿真获得熔接涂层与基体结合界面处的应力分布特性,得到熔接涂层与基体的力学性能匹配性。方法应用ABAQUS有限元软件,将模型沿轴向和径向剖切,讨论不同扭矩载荷下镍基合金涂层和基体轴结合界面的应力分布规律,分析涂层厚度对结合界面处应力的影响。结果从模型剖切后采样结点的应力变化曲线看,基体和涂层的内部应力变化均匀,在基体和涂层结合处应力存在突变,涂层上的应力大于基体上的应力。涂层厚度从0.5 mm增大到1.0 mm时最大应力减小量约为18 MPa,从1.0 mm增大到2.5 mm时最大应力的减小量约为1 MPa,涂层厚度大于1.0 mm后最大应力减小量变化不明显。结合面两侧涂层和基体应力差值的最大值Δσ_(max)随着涂层厚度的增大有所减小,在涂层厚度小于1.0 mm时,变化较为明显。结合面底面处的应力突变随涂层厚度的增加而略有减小。结论在涂层和基体结合界面处存在应力突变,最大应力出现在涂层外表面的中心位置,增大涂层厚度可以减小应力突变,在涂层厚度较小时效果明显。
[Abstract]:Aim to obtain the stress distribution at the interface between the weld coating and the substrate by finite element simulation, and to obtain the mechanical properties matching between the weld coating and the substrate.Methods ABAQUS finite element software was used to cut the model along axial and radial direction to discuss the stress distribution of the interface between Ni-base alloy coating and substrate under different torque loads, and to analyze the influence of coating thickness on the stress at the interface.Results from the stress curve of the sampling node after the model cutting, the internal stress of the substrate and the coating changed uniformly, and there was a sudden change in the stress at the joint of the substrate and the coating, and the stress on the coating was larger than that on the substrate.When the coating thickness increases from 0.5 mm to 1.0 mm, the maximum stress decrease is about 18 MPA, and the maximum stress decrease from 1.0 mm to 2.5 mm is about 1 MPA. The maximum stress decrease is not obvious when the coating thickness is greater than 1.0 mm.The maximum value of stress difference between coating and substrate on both sides of the bonding surface 螖蟽 _ max) decreases with the increase of coating thickness, and the change is more obvious when the coating thickness is less than 1.0 mm.The stress abrupt change at the bottom of the bonding surface decreases slightly with the increase of coating thickness.Conclusion there is a stress mutation at the interface between the coating and the substrate, and the maximum stress appears at the center of the outer surface of the coating. Increasing the thickness of the coating can reduce the stress mutation, and the effect is obvious when the coating thickness is small.
【作者单位】：沈阳理工大学;
【基金】：辽宁省特聘教授资助项目~~
【分类号】：TG174.4

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