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首页> 外文期刊>Journal of the mechanical behavior of biomedical materials >Influence of alignment and microstructure features on the mechanical properties and failure mechanisms of cellulose nanocrystals (CNC) films
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Influence of alignment and microstructure features on the mechanical properties and failure mechanisms of cellulose nanocrystals (CNC) films

机译：对准和微观结构特征对纤维素纳米晶体（CNC）膜的力学性能和失效机理的影响

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摘要

The mechanical properties of cellulose nanocrystal (CNC) films critically depend on many microstructural parameters such as fiber length distribution (FLD), fiber orientation distribution (FOD), and the strength of the interactions between the fibers. In this paper, we use our coarse-grained molecular model of CNC to study the effect of length and orientation distribution and attractions between CNCs on the mechanical properties of neat CNCs. The effect of misalignment of a 2D staggered structure of CNC with respect to the loading direction was studied with simulations and analytical solutions and then verified with experiments. To understand the effect of FLD and FOD on the mechanical performance, various 3D microstructures representing different case studies such as highly aligned, randomly distributed, short length CNCs and long length CNCs were generated and simulated. According to the misalignment study, three different failure modes: sliding mode, mixed mode, and normal mode were defined. Also, comparing the effects of FOD, FLD, and CNC interaction strength, shows that the adhesion strength is the only parameter that can significantly improve the mechanical properties, regardless of loading direction or FOD of CNCs.
机译：纤维素纳米晶（CNC）薄膜的力学性能主要取决于许多微观结构参数，如纤维长度分布（FLD）、纤维取向分布（FOD）以及纤维之间相互作用的强度。在本文中，我们使用我们的粗颗粒CNC分子模型来研究CNC之间的长度和取向分布以及吸引力对纯CNC力学性能的影响。通过仿真和解析解研究了数控系统二维交错结构相对于加载方向的失调效应，并通过实验进行了验证。为了了解FLD和FOD对机械性能的影响，生成并模拟了代表不同案例研究的各种3D微结构，例如高度对齐、随机分布、短长度CNC和长长度CNC。根据失准研究，定义了三种不同的失效模式：滑动模式、混合模式和正常模式。此外，对比FOD、FLD和CNC相互作用强度的影响，表明无论CNC的加载方向或FOD如何，粘合强度是唯一能显著改善机械性能的参数。

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