| 木材高温干燥过程中的弹性应变 |
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| 引用本文： | 李大纲,顾炼百.木材高温干燥过程中的弹性应变[J].木材工业,2000,14(2):15-17. |
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| 作者姓名： | 李大纲 顾炼百 |
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| 作者单位： | 南京林业大学木材工业学院!南京210037 |
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| 摘 要： | 本文对美洲黑杨锯材高温干燥过程中的弹性应变进行了研究。结果表明：高温干燥使得木材表层产生较大的塑化变定，并对干燥后期木材内层的正常收缩造成障碍。心层的拉伸应力与木材内裂有关，当心层拉伸应力超过木材横纹拉伸极限强度时，木材产生内裂。因此，在用高温干燥工艺快速干燥杨木类软阔叶树材时，在干燥后期应注意由于干燥应力转向而引起的干燥缺陷。
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| 关 键 词： | 木材干燥 高温干燥 弹性应变 |
Elasticity Strain of Wood in High Temperature Drying |
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| LI Da gang,GU Lian bai.Elasticity Strain of Wood in High Temperature Drying[J].China Wood Industry,2000,14(2):15-17. |
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| Authors: | LI Da gang GU Lian bai |
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| Abstract: | The surface layer of the lumber can be greatly plasticized in the high temperature drying. Th e internal cracking may be produced due to the restraint of regular shrinkage in the internal layer in the later drying period. The internal cracking is related to the tensile stress of the core layer. When the tensile stress of the core layer is bigger than the tensile strength perpendicular to grain of wood, the internal crack will appear. Therefore, when the high temperature drying technology is used to rapidly dry the soft broadleaf lumber such as the poplar( Populus deltoides Bartr.) wood, attention should be paid to the drying defect due to the drying stress reversal in the later drying period. |
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| Keywords: | Wood High temperature drying Elasticity strain |
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