Comparative Analysis of Actual Processing Conditions in ECAE between FEM and Both Analytical and Experimental Results
Comparative Analysis of Actual Processing Conditions in ECAE between FEM and Both Analytical and Experimental Results
复制标题
DOI：
10.1080/10426914.2010.536929
复制
发表时间：
2011-05
影响因子：
4.8
通讯作者：
C. J. Luis Pérez;R. Luri
中科院分区：
文献类型：
--
作者：
C. J. Luis Pérez;R. Luri
等通道转角挤压（ECAE）工艺是一种剧烈塑性变形（SPD）工艺，其主要目的是赋予被加工材料高值的变形，这导致晶粒尺寸减小，从而改善其机械性能。虽然在工艺中实现的应变很重要，但所需的力和挤出压力也是同样重要的设计因素。与其他金属成形工艺一样，必须在实现的应变和所需的力之间采用折衷解决方案。在这项研究中，有限元法（FEM）和上限法（UBM）的基础上的分析方法被用于建模和比较ECAE过程中所需的力时，应变硬化材料被认为是。此外，为了验证有限元建模，进行了实验结果。采用不同几何参数的有限元模拟，并使用实验设计（DOE）工具，获得了一个数学模型。利用该模型可以预测加工挤压力。为了将加工材料的实际行为与有限元分析和分析结果进行比较，选择5083-AA作为加工材料。尽管如此，开发的方法可以适用于不同的材料与应变硬化。
Equal Channel Angular Extrusion (ECAE) process is a severe plastic deformation (SPD) process whose principal purpose is to impart high values of deformation to the processed material, which leads to a grain size reduction and hence to an improvement in its mechanical properties. Although the strain achieved is important in the process, the required force and the extrusion pressure are equally important design factors. Like other metal-forming processes, a compromise solution between the strain achieved and the force required has to be applied. In this study, both the finite element method (FEM) and analytical methods based on the upper bound method (UBM) were used for modelling and comparing the forces required in the ECAE process when strain-hardening materials are considered. In addition, experimental results were carried out in order to validate the FEM modelling. Several FEM simulations, with different geometric parameters, were run, and by using design of experiments (DOE) tools, a mathematical model was obtained. By using this model, the processing extrusion pressure can be predicted. In order to compare the actual behaviour of processed materials with FEM and analytical results, a 5083-AA was chosen as processed material. Nevertheless, the methodology developed could be applied to different materials with strain hardening.