Material damage evaluation with measured microdefects and multiresolution numerical analysis
Material damage evaluation with measured microdefects and multiresolution numerical analysis
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DOI：
10.1177/1056789513501913
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发表时间：
2014-05
影响因子：
4.2
通讯作者：
Jie Shen;Jianghui Mao;J. Boileau;C. Chow
中科院分区：
文献类型：
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作者：
Jie Shen;Jianghui Mao;J. Boileau;C. Chow
本文提出了一种基于x射线计算机层析检测微缺陷和多尺度计算机模拟的材料损伤评估方法。这是通过开发宏观材料试件中材料退化的数字诊断和全场数值计算方法来实现的。该方法包括三个基本组成部分：(a)宏观材料试件微/中尺度材料缺陷的数字化检测与处理；(b)多层次网格划分和多层次有限元分析，以评价局部/整体材料退化；(c)材料损伤的同步实验和数值测定。该方法的独特贡献包括：(a)多级有限元网格和分析方案，使宏观试件材料退化的现场估计在常规工作站上易于计算；(b)中尺度材料缺陷（即那些特征尺寸从几微米到几毫米的缺陷）的现场勘探，这在工程部件的失效分析中起着至关重要的作用。(c)与连续损伤力学和微观力学中的传统分析模型相比，该方法在估计材料有效模量方面提供了明显更好的精度。铝合金的测试结果证实了我们的方法在材料降解的数字询问中的有效性。
This paper presents an alternative method of material damage evaluation based on the X-ray computer tomography-detected microdefects and multiscale computer simulation. This is achieved by developing a method of the digital diagnosis and full-field numerical calculation of material degradation in macroscopic material test specimens. The method comprised three basic components: (a) digital detection and processing of micro/mesoscale material defects of macroscopic material test specimens; (b) multilevel meshing and multilevel finite element analysis for evaluating local/global material degradation; and (c) synchronized experimental and numerical determination of material damage. The unique contributions of the proposed approach include (a) a multilevel finite element meshing and analysis scheme that makes the full-field estimation of material degradation in macroscopic test specimens computationally tractable on regular workstations, (b) full-field exploration of mesoscale material defects (i.e., those with a feature size from several micrometers to a few millimeters), which play a crucial role in failure analysis of engineering components, and (c) the proposed method offers a significantly better accuracy in estimating material degradation in terms of effective modulus than the conventional analytical models in continuum damage mechanics and micromechanics. Test results of aluminum alloys confirm the efficacy of our approach in the digital interrogation of material degradation.