On the inverse identification of wood elastic properties using a DIC-based FEMU approach

IF 3.5 Q1 ENGINEERING, MULTIDISCIPLINARY
J. Henriques, J. Xavier, A. Andrade-Campos
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引用次数: 0

Abstract

PurposeThis work aims to identify the linear elastic orthotropic material paramters of Pinus pinaster Ait. wood, using full-field measurements and an inverse identification strategy based on the finite element (FE) method updating technique.Design/methodology/approachCompression tests are carried out under uniaxial and quasi-static loading conditions on wood specimens oriented on the radial-tangential (RT) plane, with different grain orientations. Full-field displacements and strains are measured using digital image correlation (DIC), which are then used as a reference in the identification procedure. A FE model is implemented assuming plane stress conditions, where wood is modelled as an orthotropic homogeneous material. Based on the numerical results, a synthetic image reconstruction scheme is implemented to synthetically deform the reference experimental image, which is then processed by DIC and further compared to the experimental results.FindingsThe results for both approaches were similar when both specimen configurations were used in a single run. However, when using the DIC-based FEMU approach with the on-axis configuration, the identified modulus of elasticity in the tangential direction and shear modulus are closer to the reference values.Originality/valueThis approach ensures a fair comparison between both sets of data since the full-field strain maps are obtained through the same filter and therefore have the same strain formulation, spatial resolution and data filtering. Firstly, the identification is performed using a single configuration, either the on-axis or the off-axis specimen. Secondly, the identification is carried out by merging data from both on-axis and off-axis configurations.
基于dic的FEMU方法反演木材弹性性能研究
目的确定松属植物线弹性正交各向异性材料的参数。wood,使用全场测量和基于有限元(FE)方法更新技术的反向识别策略。设计/方法/方法在单轴和准静态载荷条件下,对径向切向(RT)平面上定向的具有不同晶粒取向的木材试样进行压缩试验。使用数字图像相关(DIC)测量全场位移和应变,然后将其用作识别过程中的参考。在假设平面应力条件下实现有限元模型,其中木材被建模为正交各向异性均质材料。基于数值结果,实现了一种合成图像重建方案,对参考实验图像进行综合变形,然后通过DIC进行处理,并与实验结果进行比较。发现当两种样本配置在一次运行中使用时,两种方法的结果相似。然而,当使用轴上配置的基于DIC的FEMU方法时,确定的切向弹性模量和剪切模量更接近参考值。原创性/价值这种方法确保了两组数据之间的公平比较,因为全场应变图是通过相同的滤波器获得的,因此具有相同的应变公式、空间分辨率和数据过滤。首先,使用单一配置进行识别,即轴上或离轴样本。其次,通过合并轴上和轴外配置的数据来进行识别。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
International Journal of Structural Integrity
International Journal of Structural Integrity ENGINEERING, MULTIDISCIPLINARY-
CiteScore
5.40
自引率
14.80%
发文量
42
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