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Virtual tests of elastodynamic response of natural fiber-reinforced orthotropic plates

机译：天然纤维正交异性板弹性力学响应的虚拟测试

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摘要

Natural fiber-reinforced composite (NFRC) is a new type of environmental-friendly material for the excellent performance in natural degradation, low cost and rich sources. The mechanical parameters such as elastic modulus of NFRC material is intrinsically inhomogeneous, and a normal distribution model of Young's modulus of natural fibers combined with finite element method (FEM) was developed to investigate the elastodynamic response of NFRC plates. The FEM with heterogeneity material model allows every computation produces a different result, which thus can be taken as a virtual test for NFRC structures, and the statistical result can be obtained according to multiple computations. It is found that in-plane displacements of plate increase dramatically and cannot be rationally neglected even for a thin NFRC plate when the inhomogeneity of Young's modulus of natural fibers was considered. The displacement oscillation and deflection distortion were clearly observed during the impact response, where the high curvature of deflection contours indicated high deformation gradient and may cause the potential local damage. Also it is found that material inhomogeneity is the other important factor to excite dynamical rhythm response of NFRC plates.
机译：天然纤维增强复合材料（NFRC）是一种新型的环保材料，具有出色的自然降解性能，低成本和丰富的来源。诸如NFRC材料的弹性模量等力学参数本质上是不均匀的，并结合有限元方法（FEM）建立了天然纤维杨氏模量的正态分布模型，以研究NFRC板的弹性动力响应。具有异质性材料模型的FEM允许每次计算产生不同的结果，因此可以将其用作NFRC结构的虚拟测试，并且可以根据多次计算获得统计结果。发现当考虑天然纤维的杨氏模量的不均匀性时，即使对于薄的NFRC板，板的面内位移也急剧增加并且不能被合理地忽略。在冲击响应过程中可以清楚地观察到位移振荡和挠曲变形，挠曲轮廓的高曲率表明变形梯度较高，并可能造成潜在的局部损坏。还发现，材料不均匀性是激发NFRC板的动态节奏响应的另一个重要因素。

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