Zielinski Tjarden, Vovk Andrey, Riemer Oltmann, Karpuschewski Bernhard
Leibniz-Institut für Werkstofforientierte Technologien-IWT, 28359 Bremen, Germany.
MAPEX Center for Materials and Processes, University of Bremen, 28359 Bremen, Germany.
Micromachines (Basel). 2021 May 6;12(5):526. doi: 10.3390/mi12050526.
The functional properties of a workpiece are determined by a modification of the surface and subsurface materials. In this work, the correlation between thermo-mechanical material loads and the modification of the residual stresses is presented. While the resulting residual stresses were measured by X-ray diffraction after machining experiments, the material loads were determined using a process simulation. The experimental data (measured process forces and results from previous experiments) are used to validate the simulation, which is then applied to calculate the internal thermo-mechanical loads of the maximal temperature and the equivalent von-Mises-stresses per volume element during the machining experiments. In conclusion, a higher depth impact of mechanical loads compared to a lower depth impact of thermal loads in precision machining is observed. For the sake of novelty, the thermo-mechanical loads were plotted and interpreted in a three-dimensional fashion. Finally, cross sections of this mutual representation at certain constant material loads-thermal and mechanical-result in a process signature, which can prospectively improve the prediction of functional workpiece properties.
工件的功能特性由表面和次表面材料的改性决定。在这项工作中，给出了热机械材料载荷与残余应力改性之间的相关性。在加工实验后通过X射线衍射测量产生的残余应力，而使用过程模拟确定材料载荷。实验数据（测量的过程力和先前实验的结果）用于验证模拟，然后将其应用于计算加工实验期间每个体积元素的最高温度和等效冯·米塞斯应力的内部热机械载荷。总之，在精密加工中观察到机械载荷的深度影响高于热载荷的较低深度影响。为了新颖性，以三维方式绘制和解释热机械载荷。最后，在某些恒定的材料载荷（热载荷和机械载荷）下这种相互表示的横截面产生一个过程特征，这可以前瞻性地改进对工件功能特性的预测。
