Accurate measurement of the surface residual stresses generated by milling in pre-equilibrium state

作者：Meng, Longhui^*; Atli, Maen^*; Yang, Yinfei^*; He, Ning

来源：Journal of Materials Research, 2016, 31(14): 2076-2087.

DOI：10.1557/jmr.2016.205

• stress
• strain relationship
• simulation
• surface chemistry

We introduce a method to measure accurately surface residual stresses in the pre-equilibrium state, which were generated in workpieces during the milling process. The method takes into account strain changes and uses the inverse calculation. Material in the stress layer was removed layer by layer, and the strain change on the opposite side of the machined surface was measured. We also consider the change of the bending moment caused by the changed neutral layer. The stress values were calculated from the last layer to the first layer, and the residual stresses generated by milling are measured. We created a finite element model of a real workpiece and the measured stress values were used as inputs for the model. The measuring method was validated using finite element analysis. We find that our measuring method can be successfully used in practice to measure surface residual stresses and it provides reliable indicators for evaluating the surface properties of machined workpieces.

• 出版日期2016-7-28
• 单位南京航空航天大学