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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 3.4 ) 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.



中文翻译:

Ti6Al4V合金在不同预应力作用下产生的表面残余应力的研究

摘要

机加工引起的残余应力在制造最终产品的耐腐蚀性和疲劳寿命中起着重要作用。在当前的研究中,进行了铣削实验以研究预应力对表面残余应力的影响。为此,执行了基于任意拉格朗日-欧拉方法的正交切削的有限元(FE)模拟。为了验证仿真结果,设计了一种在加工过程之前用预应力拉伸工件的设备。根据去除每个材料层后工件变化的弯曲挠度,测量在不同预应力下获得的残余应力。结果是,发现在不同预应力下获得的残余应力分布的总体变化趋势与有限元模拟结果吻合良好,表明所提出的残余应力测量原理是可靠的。此外,负载在Ti6Al4V零件上的预应力会显着影响加工引起的残余应力的分布,这意味着可以通过在加工过程中采用适当的预应力值来调整表面残余应力。

更新日期:2020-03-24
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