Effect of microscopic tissue on three-body abrasion in cell structure of wood

Three-body abrasion of softwood and hardwood was performed by rubbing the wood with different sizes of abrasive grain. The effect of microscopic tissue in a cellular solid, such as wood, on three-body abrasion was investigated. We found the following abrasion properties. The wear rate after rubbing perpendicularly to the fiber and annual ring tended to be larger than the wear rate after rubbing in parallel. Also, this abrasion property particularly affected fiber with a different direction for each surface and an annual ring with a cell wall of a different thickness. When hardwood was rubbed with a particular grain size, there was a maximum peak at which the wear rate increased irregularly, and this dependence on the abrasive grain size was different from that of softwood. The peculiar dependence on the abrasive grain size corresponds to the value of the vessel cell size, and a highly positive correlation was observed between the abrasive grain size and vessel cell size.