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Research on surface residual stresses generated by milling Ti6Al4V alloy under different pre-stresses
The International Journal of Advanced Manufacturing Technology ( IF 2.496 ) Pub Date : 2020-03-23 , DOI: 10.1007/s00170-020-05165-5
Longhui Meng, Aqib Mashood Khan, Hao Zhang, Chenggang Fang, Ning He

Abstract Machining-induced residual stress plays a significant role in the corrosion resistance and fatigue life of the manufacturing end product. In the current study, milling experiments were performed to investigate the influence of pre-stress on the surface residual stresses. For this purpose, finite element (FE) simulations of the orthogonal cutting based on arbitrary Lagrangian-Eulerian approach were performed. To validate the simulation results, a device was designed to stretch the workpiece with pre-stresses before the machining process. The residual stresses obtained under different pre-stresses were measured based on the varied bending deflection of the workpiece after each material layer removal. As a result, the general variation trend of residual stress profiles that obtained under different pre-stresses was found well consistent with the finite element simulation results, indicating that the proposed residual stress measuring principle is reliable. Furthermore, the pre-stress loaded on the Ti6Al4V part can significantly affect the distribution of machining-induced residual stresses, implying that surface residual stresses can be adjusted by employing appropriate values of pre-stresses during the machining process.
更新日期:2020-03-24

 

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