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Official Journal of the Japan Wood Research Society

Table 1 Symbols in the present paper

From: Influence of moisture content on estimating Young’s modulus of full-scale timber using stress wave velocity

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