Scientia Silvae Sinicae ›› 2023, Vol. 59 ›› Issue (5): 145-156.doi: 10.11707/j.1001-7488.LYKX20220293
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Zheng Wang,Xiaoyu Gu,Yuhao Zhou,Yifan Zhang,Zhaoyu Shen,Yujie Huang
Received:
2022-05-05
Online:
2023-05-25
Published:
2023-08-02
CLC Number:
Zheng Wang,Xiaoyu Gu,Yuhao Zhou,Yifan Zhang,Zhaoyu Shen,Yujie Huang. Free Square Plate Torsional Mode Method for Measurement of Shear Modulus of Timber[J]. Scientia Silvae Sinicae, 2023, 59(5): 145-156.
Table 1
Input parameters of ANSYS modal block calculation of Picea sitchensis, Fagus longipetiolata, Pinus sylvestris and Pseudotsuga menziesii"
树种 Species | ρ/(kg·m?3) | 主向面 Main-direction plane | Ex/GPa | Ey/GPa | Ez/GPa | μxy | μyz | μxz | Gxy/GPa | Gyz/GPa | Gxz/GPa |
西加云杉 Picea sitchensis | 390 | LT | 11.60 | 0.50 | 0.90 | 0.47 | 0.250 | 0.370 | 0.720 | 0.039 | 0.75 |
LR | 11.60 | 0.90 | 0.50 | 0.37 | 0.430 | 0.470 | 0.750 | 0.039 | 0.72 | ||
RT | 0.90 | 0.50 | 11.60 | 0.43 | 0.020 | 0.029 | 0.039 | 0.720 | 0.75 | ||
山毛榉 Fagus longipetiolata | 750 | LT | 13.70 | 1.14 | 2.24 | 0.51 | 0.360 | 0.450 | 1.060 | 0.460 | 1.61 |
LR | 13.70 | 2.24 | 1.14 | 0.45 | 0.750 | 0.510 | 1.610 | 0.460 | 1.06 | ||
RT | 2.24 | 1.14 | 13.70 | 0.75 | 0.044 | 0.073 | 0.460 | 1.060 | 1.61 | ||
欧洲赤松 Pinus sylvestris | 550 | LT | 16.30 | 0.57 | 1.10 | 0.57 | 0.310 | 0.420 | 0.680 | 0.066 | 1.16 |
LR | 16.30 | 1.10 | 0.57 | 0.42 | 0.680 | 0.570 | 1.160 | 0.066 | 0.68 | ||
RT | 1.10 | 0.57 | 16.30 | 0.68 | 0.150 | 0.038 | 0.066 | 0.680 | 1.16 | ||
北美黄杉 Pseudotsuga menziesii | 590 | LT | 16.40 | 0.90 | 1.30 | 0.37 | 0.400 | 0.430 | 0.910 | 0.079 | 1.18 |
LR | 16.40 | 1.30 | 0.90 | 0.43 | 0.630 | 0.370 | 1.180 | 0.079 | 0.91 | ||
RT | 1.30 | 0.90 | 16.40 | 0.63 | 0.024 | 0.028 | 0.079 | 0.910 | 1.18 |
Table 2
Main-direction mode shape coefficient of timber free square plate at the different width-thickness ratio"
方板宽厚比 Width-thickness ratio | 木材方板主向振型系数 Main-direction mode shape coefficient | ||
LT | LR | RT | |
7 | 7.566 3 | 7.569 4 | 8.479 0 |
10 | 7.640 7 | 7.646 8 | 8.491 3 |
15 | 7.698 5 | 7.724 9 | 8.512 3 |
20 | 7.717 7 | 7.752 8 | 8.538 2 |
25 | 7.730 4 | 7.771 2 | 8.566 8 |
30 | 7.706 4 | 7.766 6 | 8.587 2 |
均值Mean | 7.671 5 | 7.698 0 | 8.524 1 |
变异系数 Coefficient of variation (%) | 0.77 | 1.01 | 0.51 |
Table 3
Basic parameters of square plate specimens and asymmetric four-point bending specimens"
材质或树种 Material | l/mm | b/mm | h/mm | 数量 Quantity/piece | b/h | ρ/(kg·m?3) | 含水率 Moisture content(%) |
胶合板(7层) Plywood (7 layers) | 240 | 240 | 9.00 | 5 | 26.7 | 581 | 9.0 |
定向刨花板 OSB | 120 | 120 | 10.94 | 6 | 11.0 | 623 | 9.0 |
铁杉弦向 Tangential Tsuga chinensis | 135 | 135 | 12.95 | 5 | 10.4 | 422 | 9.5 |
红雪松弦向 Tangential Thuja plicata | 147 | 147 | 13.96 | 5 | 10.5 | 385 | 9.0 |
西加云杉径向 Radial Picea sitchensis | 115 | 115 | 12.44 | 6 | 9.2 | 408 | 9.5 |
西加云杉横向 Transverse Picea sitchensis | 116 | 116 | 11.89 | 6 | 9.8 | 368 | 9.0 |
落叶松弦向 Tangential Larix gmelinii | 155 | 155 | 9.61 | 8 | 16.1 | 590 | 9.0 |
落叶松径向 Radial Larix gmelinii | 118 | 118 | 11.41 | 6 | 10.3 | 748 | 9.0 |
落叶松弦向 Tangential Larix gmelinii | 240 | 20 | 20.12 | 6 | 非对称四点弯曲 Asymmetric four-point bending | 628 | 9.5 |
落叶松径向 Radial Larix gmelinii | 240 | 20 | 24.03 | 6 | 非对称四点弯曲 Asymmetric four-point bending | 748 | 8.0 |
Table 4
Basic parameters of free-rod torsional vibration method (verification test)"
材质或树种 Material | l/mm | b/mm | h/mm | 数量 Quantity/piece | ρ/(kg·m?3) | 含水率 Moisture content(%) |
胶合板(7层) Plywood (7 layers) | 340 | 60 | 8.98 | 8 | 550 | 9.5 |
定向刨花板 OSB | 699 | 113 | 11.27 | 3 | 639 | 9.0 |
铁杉弦向 Tangential Tsuga chinensis | 405 | 133 | 12.80 | 3 | 475 | 9.0 |
红雪松弦向 Tangential Thuja plicata | 768 | 148 | 19.92 | 3 | 389 | 9.0 |
西加云杉径向 Radial Picea sitchensis | 400 | 71 | 12.39 | 8 | 379 | 9.5 |
西加云杉横向 Transverse Picea sitchensis | 400 | 71 | 12.36 | 8 | 367 | 9.0 |
Table 5
Shear modulus of Larix gmelinii chordwise 155, 115, 90 and 70 mm free square plate torsional modal method"
l/ mm | b/ mm | h/ mm | 数量 Quantity/piece | b/h | ρ/ (kg·m?3) | MPa | MPa |
155 | 155 | 9.60 | 8 | 16.1 | 590 | 880(10.8%) | 917(10.7%) |
115 | 115 | 9.65 | 8 | 11.9 | 579 | 839(12.4%) | 913(12.4%) |
90 | 90 | 9.68 | 8 | 9.3 | 567 | 800(15.5%) | 917(15.5%) |
70 | 70 | 9.68 | 8 | 7.2 | 569 | 765(19.0%) | 944(19.0%) |
Table 6
Shear modulus of radial Larix gmelinii 118 mm× 118 mm free square plate at width-thickness ratios of 10.3 and 14.8"
l/ mm | b/ mm | h/ mm | 数量 Quantity/piece | b/h | ρ/ (kg·m?3) | MPa | MPa | |
118 | 118 | 11.47 | 6 | 10.3 | 748 | 1 232(2.3%) | 1 444(2.3%) | |
118 | 118 | 7.95 | 6 | 14.8 | 742 | 1 317(2.5%) | 1 426(2.5%) |
Table 7
Principal shear modulus of wood measured by free square plate torsional modal method and its experimental verification"
树种 Species | 主向 Main-direction plane | 自由方板扭转模态法剪切模量 G obtained by free square plate torsional mode method /MPa | 自由杆件扭转振动法剪切模量 G obtained by free rod torsional vibration method/MPa |
铁杉 Tsuga chinensis | LT | 686(3.3%) | 637 (7.7%) |
红雪松 Thuja plicata | LT | 704 (6.2%) | 698 (7.5%) |
西加云杉 Picea sitchenrsis | LR | 699 (1.4%) | 737 (9.5%) |
西加云杉 Picea sitchenrsis | RT | 44.6 (12.9%) | 47.0(8.3%) |
Table 9
Free-square-plate torsional modal method and free-square-plate torsional vibration method for the determination of shear modulus of wood and wood composites"
材质和树种 Material | 宽宽厚比 b/h | 自由方板扭转模态法剪切模量G obtained by free square plate torsional mode method/MPa | 自由方板扭转振动法剪切模量 G obtained by free rod torsional vibration method/MPa |
铁杉弦向 Tangential Tsuga chinensis | 11.3 | 686 (3.3%) ) | 559 (3.3%) |
红雪松弦向 Tangential Thuja plicata | 10.5 | 704(6.2%) | 576 (10.1%) |
西加云杉径向 Radial Picea sitchenrsis | 9.2 | 699 (1.4%) | 510 (1.1%) |
西加云杉横向 Transverse Picea sitchenrsis | 9.8 | 44.6 (12.9%) | 36.2 (14.6) |
OSB | 11.0 | 1 328(6.8%) | 1 137 (7.2%) |
胶合板 Plywood (7 layers) | 26.7 | 763 (4.3%) | 736 (4.3%) |
Table 10
LVL longitudinal shear modulus tested by free plate torsional vibration method and free rod torsional vibration method"
长 Length/mm | 宽 Width/mm | 厚 Thickness/mm | 长宽比 Aspect ratio | 自由板扭转振型法 Free plate torsional mode method G/MPa | 自由杆件扭转振动法 Free-rod torsional vibration method G/MPa |
320 | 100 | 10.8 | 3.2 | 915(2.5%) | 985(3.2%) |
220 | 100 | 10.8 | 2.2 | 884(5.9%) | 978(5.9%) |
100 | 100 | 10.8 | 1.0 | 757(1.4%) | 794(1.4%) |
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Cheng K, Wang Z. New method for testing shear modulus based on torsional vibration shape of free plate. Journal of Nanjing Tech University(Natural Science Edition), 2015, 37 (5): 61- 66. | |
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