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Influence of of Lode angle on modelling of void closure in hot metal forming processes

机译:倾角对铁水成形过程中空洞闭合建模的影响

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摘要

The presence of voids after casting processes of large metal workpieces requires the use of adapted hot metal forming processes to deliver sound products. Yet, there is at present a lack of knowledge regarding void closure mechanisms and there is no reliable model that can accurately predict void closure. The main aim of this work is to develop a highly accurate mean field model able to predict the evolution of the voids volume after each forming stage. This proposed model is accounting for both stress triaxiality ratio T-x, and Lode angle theta in order to override the hypothesis of axisymmetric loading, which is generally considered in the existing models handling void closure in the literature. Based on an advanced multiscale approach, this model also accounts for voids shape and orientation. An optimization method, using a database of explicit RVE simulations, is developed in order to calibrate the new proposed model. Several void morphological parameters and an industrial range of mechanical loading parameters are analyzed regarding void closure. The proposed mean field model is validated by comparison with explicit full field simulations and with a recent pre-existing mean field model, named Cicaporol model hereafter (Saby et al., 2015 [19]). In comparison with Cicaporol, the new model, named Cicaporo2 hereafter, uses less constants and is more accurate.
机译:在大型金属工件的铸造过程之后,空隙的存在要求使用经过调整的铁水成形过程来输送合格的产品。然而,目前缺乏关于空隙闭合机制的知识,并且还没有可以准确预测空隙闭合的可靠模型。这项工作的主要目的是建立一个高度精确的平均场模型,该模型能够预测每个成型阶段后空隙体积的变化。为了克服轴对称载荷的假设,该提出的模型同时考虑了应力三轴比T-x和Lode角theta,这在文献中处理空隙封闭的现有模型中通常会考虑。基于先进的多尺度方法,该模型还考虑了空隙的形状和方向。为了校准新提出的模型,开发了一种使用显式RVE模拟数据库的优化方法。关于空隙封闭,分析了几个空隙形态参数和机械载荷参数的工业范围。拟议的平均场模型通过与显式全场模拟和最近存在的平均场模型(以下称为Cicaporol模型)进行比较进行了验证(Saby等人,2015 [19])。与Cicaporol相比,以下称为Cicaporo2的新模型使用的常量更少,准确性更高。

著录项

  • 来源
    《Finite Elements in Analysis and Design》 |2017年第4期|13-25|共13页
  • 作者单位

    Mines ParisTech, CEMEF Ctr Misee Forme Mat, CNRS UMR 7635, CS 10207,1 Rue Claude Daunesse, F-06904 Sophia Antipolis, France;

    Mines ParisTech, CEMEF Ctr Misee Forme Mat, CNRS UMR 7635, CS 10207,1 Rue Claude Daunesse, F-06904 Sophia Antipolis, France;

    Mines ParisTech, CEMEF Ctr Misee Forme Mat, CNRS UMR 7635, CS 10207,1 Rue Claude Daunesse, F-06904 Sophia Antipolis, France;

    Mines ParisTech, CEMEF Ctr Misee Forme Mat, CNRS UMR 7635, CS 10207,1 Rue Claude Daunesse, F-06904 Sophia Antipolis, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Void closure; Mean field model; Mesoscale; Optimization algorithm; Lode angle;

    机译:空隙闭合;平均场模型;中尺度;优化算法;罗德角;
  • 入库时间 2022-08-18 02:58:47

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