Microimaging-informed continuum micromechanics accurately predicts macroscopic stiffness and strength properties of hierarchical plant culm materials

被引:29
作者
Gangwar, Tarun [1 ,2 ]
Schillinger, Dominik [1 ]
机构
[1] Univ Minnesota, Dept Civil Environm & Geoengn, St Paul, MN 55455 USA
[2] Univ Minnesota, Dept Civil Environm & Geoengn, 500 Pillsbury Dr SE, Minneapolis, MN 55455 USA
基金
美国国家科学基金会; 芬兰科学院;
关键词
Continuum micromechanics; Microimaging; Hierarchical multiscale materials; Plant culm materials; Bamboo stiffness and strength; FINITE-ELEMENT-ANALYSIS; CELL-WALL; ELASTIC PROPERTIES; MECHANICAL-PROPERTIES; NATURAL FIBER; BAMBOO; BONE; WOOD; BEHAVIOR; MODULUS;
D O I
10.1016/j.mechmat.2019.01.009
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Plant materials exhibit a wide range of highly anisotropic mechanical behavior due to a hierarchy of microheterogeneous structures at different length scales. In this article, we present a micromechanics approach that derives a hierarchical microstructure driven model of macroscopic stiffness and strength properties of anisotropic culm materials. As model input, it requires mechanical properties of the base constituents such as cellulose and lignin as well as morphology and volume fractions of all heterogeneous components at each hierarchical level. The latter can be retrieved from imaging data at different length scales, obtained from scanning electron and transmission electron microscopy. We illustrate our modeling approach for the example of bamboo that has gained increasing attention in the last decade due to its role as a sustainable building material. Validating its predictions of macroscopic stiffness moduli and ultimate strength with corresponding experimental measurements, we demonstrate that the micromechanics model provides excellent accuracy without any further phenomenological calibration. We also show that the multiscale modeling approach enables a better physics-based understanding of the origins of bamboo stiffness and strength across different scales.
引用
收藏
页码:39 / 57
页数:19
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