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Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 1 Parameters of the WLF equation and Arrhenius law for Chinese fir wood in all orthotropic directions

From: Application of time–temperature superposition principle to Chinese fir orthotropic creep

Specimens

WLF

Arrhenius

C 1

C 2 (K)

ΔH (kcal mole−1)

SE (%)

ΔH (kcal mole−1)

SE (%)

L

2.56

87.32

12.36

9.19

8.26

32.86

R

9.75

253.15

16.21

7.34

15.80

23.05

T

4.74

87.55

22.80

8.64

14.96

35.86

L (J–T effect)

1.71

72.02

9.97

5.97

5.86

28.53

  1. WLF, William–Landel–Ferry equation, enunciated by Williams et al. [10], is given by log a T  = −C 1(T − T 0)/[C 2 + (T − T 0)]; C 1 and C 2, two WLF constants; ΔH, activation energy deduced from horizontal shift factor plots of raw experimental data; SE, standard error of the estimate; L (J–T effect), experimental data corrected by the vertical factor b T for L specimen
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