木材细胞壁细观断裂及其损伤机理

木材是一种由多孔状、层次状、各向异性的非均质天然高分子复合材料 ,其超微结构是细胞壁由不同厚度的层次组成。木材细胞壁组织结构与其力学特性之间的关系非常复杂 ,顺纹压缩时 ,细胞壁会压皱 ,在细胞壁受拉伸或剪切的部位会出现滑移面 ,并出现在细胞壁内或细胞壁之间的破裂 ,使得木材在受到外力后表现出宏观破坏是由于木材细胞壁及各细胞之间复杂的细观和微观断裂损伤的结果

The Mechanism of Meso Damage and Crack of Wood Cell Wall

Wood is cellular, polymeric and composite material. It is characterized by anisotropy and heterogeneity. The nanostructure of wood is described by its cell wall as an arrangement of layers of different thickness. The relationship between the structural organization of wood cell wall and its mechanical behavior is extremely complex. Such as under compression along the grain, cell wall crumple and form silp planes while under tension or shear cell wall may fracture with in or across the cell wall. The macro fracture is the results of micro damage or meso crack of cell wall of different wood cell.