Identification of Young’s Modulus from Indentation Testing and Inverse Analysis
Identification of Young’s Modulus from Indentation Testing and Inverse Analysis
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DOI：
10.1299/jmmp.4.781
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发表时间：
2010-03
期刊：
影响因子：
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通讯作者：
J. Prou;K. Kishimoto;A. Constantinescu
中科院分区：
文献类型：
--
作者：
J. Prou;K. Kishimoto;A. Constantinescu
本文首次提出了一种从连续压痕试验中识别线弹性涂层材料杨氏模量的数值方法。识别是基于逆分析，其中通过梯度下降算法执行成本函数的最小化。主要结果是通过使用直接微分技术计算成本函数梯度，从而与广泛使用的有限差分法相比节省时间。通过几个数值例子说明了这种方法的有效性和说明。本文的第二部分致力于弹塑性薄膜杨氏模量的识别。提出了一种新的方法，其中的反分析只依赖于弹性材料的有限元计算。
In this study, a numerical method for the identification of th e Young's modulus of linear elastic coated materials from continuous indentation test is first presented. The iden- tification is based on an inverse analysis where the minimiza tion of a cost functional is performed by a gradient descent algorithm. The main result is the computation of cost function gradient by using a direct differentiation technique, resulting in a time- saving method compared to the widely used finite difference method. The validity and illustration of this approach is shown through several numerical examples. The second part of this article is dedicated to the identification of ela sto-plastic thin films Young's modulus. A new method is proposed, where the inverse analysis relies only on finite element computations for elastic materials.