基于硬度-弹性模量实测关系的镀层硬度数值模拟与优化

采用ANSAYS有限元法对材料的硬度进行直接数值模拟,输入参数中无硬度参量。利用纳米显微力学探针技术确定Ti6Al4V合金表面镀Ni层的硬度和弹性模量之间的定量关系,用材料弹性模量的变化来反应硬度的变化,以镀镍层在受压状态下的应力分布分析为例,实现ANSYS软件对材料硬度的有限元数值模拟,对Ti6Al4V合金表面镀Ni层的硬度和厚度进行优化设计。结果表明,对于钛合金表面电镀纳米镍工艺,镀镍层硬度不宜超过448HV0.05;当镀镍层的硬度为439HV0.05时,合适的镀镍层厚度为1.5mm左右。

Optimization and design of the hardness of Nickel plating layer based on quantitative relationship between material hardness and elastic modulus

The material hardness could not be simulated by ANSYS software, since there was not importable parameter of hardness in ANSYS soft. The hardness and elastic modulus of the titanium alloy plated with nickel layer had been measured by Nano Indenter II, and then the quantitative relationship between them had been obtained. Therefore, the hardness could respond to elastic modulus variation, thus making the ANSYS simulation for material hardness come true. The stress distribution of nickel plating layer of titanium alloy was analyzed under compression. In addition, the hardness and thickness of nickel plating layer was optimized and designed. The results showed that the hardness of nickel plating layer should not beyond 448HV0.05; when the hardness was 439HV0.05, the suitable range of thickness should be about 1.5mm.