Since wood has recently acquired increasing attention from structural engineers due to its green and low-carbon attribute, a growing interest in understanding the intricate relationships between the microstructure of wood and the mechanical properties of building components. This study was aimed at investigating the wood micromechanical structure of plantation Chinese fir ( (Lamb.) Hook), focusing on assessing the impact of microfibril angle (MFA), chemical components and crystallinity on cell wall strength. Understanding these microstructural features is crucial, as they directly influence the overall strength of timber. Hence, significant factors contributing to the mechanical properties of the wood, i.e., the S2 layer's thickness and microfibril angle, along with the crystallinity and cellulose content, were comprehensively examined. A model was proposed to quantitatively forecast wood cell wall mechanical properties using information about MFA, chemical components, and crystallinity. This model can be used to predict the mechanical performances of wood components based on these key structural characteristics due to the close strength relationship between the micro- and macro-structures of wood.

中文翻译：

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探索木材微机械结构：微纤维角度和结晶度对细胞壁强度的影响


由于木材最近因其绿色和低碳属性而受到结构工程师越来越多的关注，人们越来越有兴趣了解木材的微观结构与建筑构件的机械性能之间的复杂关系。本研究旨在研究人工杉木（(Lamb.)Hook）木材的微机械结构，重点评估微原纤角度（MFA）、化学成分和结晶度对细胞壁强度的影响。了解这些微观结构特征至关重要，因为它们直接影响木材的整体强度。因此，对影响木材机械性能的重要因素，即 S2 层的厚度和微纤维角度，以及结晶度和纤维素含量进行了全面检查。提出了一种利用 MFA、化学成分和结晶度信息定量预测木材细胞壁力学特性的模型。由于木材的微观结构和宏观结构之间存在密切的强度关系，该模型可用于根据这些关键结构特征来预测木材构件的机械性能。