This study applied synchrotron radiation XRD to analyze the mechanical behavior of cellulose microfibrils in wood containing annual rings (thickness: 5 mm), for different layers of the secondary cell wall, under uniaxial load. Cellulose in S 2 and in S 1 and S 3 layers were analyzed respectively, and the data were used to investigate for deformation behavior in the lattice spacing ( d 004 ). As a result, the mechanical behavior of cellulose sometimes differed from the behavior of bulk wood. The rigidity of cellulose in the S 2 layer was larger than in S 1 and S 3 layers under both of tensile and compressive loads. However, once standardized with respect to estimated cellulose amount, this standardized rigidity was comparable across all layers and loading conditions. Variation in microfibril angle (MFA) and lattice spacing ( d 004 ) of cellulose barely changed at all under compressive load. Under tensile loads, there were both of positive and negative changes in MFA variation in both S 2 layer and S 1 and S 3 layers, while d 004 variation had little changes in almost all cases.

中文翻译：

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在透射和反射模式下对松树木材细胞壁层中纤维素的同步加速器 X 射线测量。第 2 部分：轴向载荷的结果

本研究应用同步辐射 XRD 来分析含有年轮（厚度：5 毫米）的木材中纤维素微纤丝在单轴载荷下对于次生细胞壁的不同层的机械行为。分别分析了 S 2 和 S 1 和 S 3 层中的纤维素，并将数据用于研究晶格间距 (d 004 ) 中的变形行为。结果，纤维素的机械性能有时不同于散装木材的性能。在拉伸和压缩载荷下，S 2 层中纤维素的刚度大于S 1 和S 3 层。然而，一旦对估计的纤维素量进行标准化，这种标准化的刚度在所有层和负载条件下都是可比的。在压缩载荷下，纤维素的微纤维角 (MFA) 和晶格间距 (d 004 ) 的变化几乎没有变化。在拉伸载荷下，S 2 层和S 1 和S 3 层的MFA 变化均存在正负变化，而d 004 变化几乎在所有情况下变化不大。