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Official Journal of the Japan Wood Research Society

Journal of Wood Science Cover Image

Table 2 The loss modulus E″ peak temperatures for specimens with different moisture content (MC) in all orthotropic directions

From: Moisture-dependent orthotropic viscoelastic properties of Chinese fir wood in low temperature environment

MC (%) α (°C) α′ (°C) β (°C)
0.5 Hz 1 Hz 2 Hz 5 Hz 10 Hz 0.5 Hz 1 Hz 2 Hz 5 Hz 10 Hz 0.5 Hz 1 Hz 2 Hz 5 Hz 10 Hz
0.6                
 L 31.7 > 40.0 > 40.0 > 40.0 > 40.0 1.7 1.7 − 58.3 − 49.3 − 46.2 − 40.3 − 37.3
 R 30.5 34.3 36.0 37.5 > 40.0 − 70.0 − 67.0 − 64.0 − 54.9 − 52.0
 T 31.9 33.9 35.9 38.9 > 40.0 − 73.1 − 70.2 − 64.1 − 58.1 -− 55.1
3.5                
 L > 40.0 > 40.0 > 40.0 > 40.0 > 40.0 0.8 0.7 1.3 1.7 − 86.3 − 81.3 − 78.3 − 75.3 − 72.3
 R 29.6 33.1 35.6 37.1 38.6 − 87.8 − 82.8 − 79.7 − 76.8 − 73.8
 T 30.0 35.0 35.3 38.0 39.3 − 87.2 − 82.0 − 78.9 − 76.0 − 73.0
6.0                
 L > 40.0 > 40.0 > 40.0 > 40.0 > 40.0 1.8 0.9 1.4 1.4 1.6 − 97.2 − 91.8 − 90.2 − 88.8 − 82.8
 R 27.5 30.5 33.5 36.5 39.0 − 91.5 − 89.5 − 86.5 − 80.5 − 77.5
 T 28.1 31.1 35.1 36.1 39.1 − 89.9 − 86.8 − 83.8 − 77.8 − 74.8
9.3                
 L > 40.0 > 40.0 > 40.0 > 40.0 > 40.0 − 0.3 0.3 0.6 1.6 2.0 − 103.1 − 96.1 − 94.6 − 93.1 − 90.1
 R 27.0 29.8 32.8 35.8 38.8 − 96.2 − 91.2 − 87.2 − 84.2 − 81.2
 T 27.2 30.2 34.2 36.3 38.2 − 93.8 − 90.8 − 87.8 − 81.8 − 78.8
14.1                
 L > 40.0 > 40.0 > 40.0 > 40.0 > 40.0 1.9 1.1 1.1 0.9 1.5 − 107.2 − 103.2 − 100.1 − 97.1 − 94.1
 R 25.8 28.8 31.8 34.8 37.7 − 98.2 − 97.3 − 94.2 − 91.2 − 83.1
 T 25.4 29.4 33.2 34.4 37.4 − 97.5 − 91.5 − 85.5 − 82.5 − 79.5
22.0                
 L > 40.0 > 40.0 > 40.0 > 40.0 > 40.0 − 0.4 1.1 1.5 − 0.5 1.4 − 113.0 − 107.5 − 104.0 − 102.5 − 101.0
 R 21.7 24.7 30.7 33.7 36.6 − 99.3 − 98.3 − 94.3 − 86.3 − 85.3
 T 21.5 25.5 29.5 32.5 36.5 − 99.5 − 96.6 − 90.5 − 87.4 − 81.4
  1. α, α′, β three relaxation processes of loss modulus