Measurement of Equivalent Surface Residual Stresses and the Depth of Affected Layer on Milled Ti6Al4V Workpiece Surface

作者：Meng Longhui; Yang Yinfei^*; He Ning; Zhao Wei

来源：Rare Metal Materials and Engineering, 2017, 46(1): 213-218.

• residual stress
• corrode
• FEA (finite element analysis)
• X-ray diffraction (XRD)

In order to predict the deformations caused by surface residual stresses generated by milling of Ti6A14V parts, a method for measuring the equivalent surface residual stresses and the effective depth was presented. The material in the surface opposite to the machined surface was removed twice; therefore, the thickness and the neutral layer of the workpiece were changed. Afterwards, the change of the bending deflections and the strains on the machined surface was measured, and then the equivalent surface residual stresses and the effective depth were calculated. FEA (finite element analysis) was used to validate the correctness of this method. The results calculated by FEA correspond well with those measured in the experiments. So it can be concluded that the results got from the method proposed in this paper are correct. It can be used to evaluate the surface residual stresses generated by milling and to predict the deformations caused by surface residual stresses, thereby forecasting whether the parts accuracy can meet the requirement.

• 出版日期2017-1
• 单位南京航空航天大学