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Identification paramétrique par recalage de modèles éléments finis couplée à des mesures de champs cinématiques et thermiques

机译:识别参数识别标准文件清单标识符清单标识符清单标记清单标识符

摘要

Material constitutive parameters are usually identified from standard tests exhibiting homogeneous strain states. However, recent improvements in inverse identification methods call upon the use of heterogeneous tests. The purpose of the present work is to develop an inverse identification procedure based on the Finite Element Updating method. Kinematic and thermal full-fields measurements are thus captured from increasingly heterogeneous tests, and provide the input data of the identification process. Various planar tests with commercially pure titanium have been performed and a new non planar experimental test has been designed and set up. This latter allows the identification of tensile, shear and expansion behaviours from a single test conducted on a standard tensile device. Digital Image Correlation along with Stereo Image Correlation is used for measurement purposes. Comparisons are made between measured data and retrieved data from a numerical model of the experiment. An optimization algorithm is used to update the constitutive parameters of the finite element model. The number of identified parameters varies with the chosen constitutive model namely : orthotropic elasticity, then anisotropic plasticity. Several validation protocols highlight the advantages of using heterogeneous rather than homogeneous tests. Moreover it has been shown that the choice of the elastic model (isotopic or ortho
机译:材料的本构参数通常由表现出均质应变状态的标准试验确定。但是,逆向识别方法的最新改进要求使用异构测试。本工作的目的是开发基于有限元更新方法的逆识别过程。因此,从越来越多样化的测试中获取了运动和热全场测量结果,并提供了识别过程的输入数据。已经使用商业纯钛进行了各种平面测试,并且已经设计并建立了新的非平面实验测试。后者允许通过在标准拉伸装置上进行的单个测试来识别拉伸,剪切和膨胀行为。数字图像关联和立体声图像关联用于测量目的。在测量数据和从实验数值模型中检索到的数据之间进行比较。优化算法用于更新有限元模型的本构参数。所识别参数的数量随所选的本构模型而变化,即:正交各向异性弹性,然后是各向异性塑性。一些验证协议突出了使用异构测试而不是同类测试的优势。此外,已经表明,弹性模型的选择(同位素或正交

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    Pottier Thomas;

  • 作者单位
  • 年度 2010
  • 总页数
  • 原文格式 PDF
  • 正文语种 fr
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