Relationship between critical stress intensity factor KIC and crack size induced by nailing for different typical wood species of timber construction
Tokuda Michio
Abstract:The objective of this research was to investigate the characteristics of KIC for wood species with reference to the information of wood crack induced by nailing. The wood crack characteristics by nailing were investigated using barium soaking method. According to the relationship between specific gravity and maximum crack length (Lm), three wood species groups were employed; Group C1: easy to crack such as Douglas-fir, Hemlock, and Lawson sypress, Group C3: hard to crack such as Radiata pine, Agathis, Japanese beech, Group C2: intermediate between C1 and C. The same wood group concept was applicable to describe the characteristic of KIC. The relationship between specific gravity and KIC could not be described by one regression curve, but within each wood group, specific gravity had a good correlation with KIC. Also, the relationship between KIC and Lm had a good correlation within each wood group. Key Words:critical stress intensity factor, crack induced by nailing, wood species group