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relationship between E ” and Δ for these panels, which was highly significant at the 0.001 level. The correlation coefficients between E ” and Δ of PB, MDF, and PW panels were 0.720, 0.718, and 0.800, respectively. (a) (b)
160
170
y = 1056.5 x + 25.3 r=0.718
y = 596.5x + 28.0 r=0.720
150
PB9 PB16 PB18 PB25
MDF9 MDF12 MDF15 MDF18
120
130
110
80
90
40
70
0.04 0.08 0.12 0.16 0.20 Δ
0.05 0.07 0.09 0.11 0.13 0.15 Δ
(c)
110
y = 838.1x + 20.8 r=0.800
PW9 PW15 PW18 PW25
90
70
50
30
0.02 0.04 0.06 0.08 0.10 Δ
Fig. 2. Relationship between loss modulus and logarithmic decrement for the three full-size WCPs (a) particleboard (PB), (b) medium density fiberboard (MDF), and (c) plywood (PW) Table 5. Linear Regression Equations and Parameters Relating Loss Modulus with Logarithmic Decrement for the Three Types of Panels
y = ax + b
Number of Panels
Correlation Coefficient ( r)
F- statistic
Level of Significance
Panel
a
b
PB
69 67 58
596.5
28.0 25.3 20.8
0.720 0.718 0.800
70.8 71.8 101
0.001 0.001 0.001
MDF
1056.5
PW
838.1
4600
Guan et al . (2016). “Dynamic viscoelasticity,” B io R esources 11(2), 4593-4604.
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