Official Journal of the Japan Wood Research Society
Mechanical properties | V | Stress wave velocity (m s−1) |
u | Moisture content (%) | |
V u /V 0 | The ratio of stress wave velocity at certain moisture content (V u ) to stress wave velocity at 0% moisture content (V 0) (Change rate of stress wave velocity) | |
V 28H | Stress wave velocity at u = 28% calculated by u − V u /V 0 curve above FSP (u ≧ 28%) (m s−1) | |
V 28L | Stress wave velocity at u = 28% calculated by u− V u /V 0 curve below FSP (u ≦ 28%) (m s−1) | |
ρ | Density (kg m−3) | |
FSP | Fiber saturation point (at 28% moisture content in this paper) | |
ρV 2 | Young’s modulus by calculation of stress wave velocity and density (GPa) (Young’s modulus using stress wave method) | |
MOE | Modulus of elasticity in bending (GPa) | |
Subscript | 0 | 0% moisture content (oven-dry condition) |
15 | 15% moisture content (air-dried condition) | |
b | Mechanical property before drying (u ≧ 28%) | |
a | Mechanical property after drying (u ≧ 28% or u ≦ 28%) | |
Coefficient | p | Slope of u− V u /V 0 curve below FSP (u ≦ 28%) (1/%) |
q | Slope of u− V u /V 0 curve above FSP (u ≧ 28%) (1/%) | |
r | Intercept of u− V u /V 0 curve above FSP (u ≧ 28%) | |
Other | n | Number of specimen |