摘要
以杉木、马尾松木材为试验材料,采用零距拉伸技术评价了木材管胞纵向抗拉强度,比较了不同含水率条件下管胞抗拉强度的差异,探讨了水分的影响机制。此外,重点研究了热处理对木材管胞纵向抗拉强度的影响,分析了管胞强度变化与化学成分、纤维素结晶度之间的关系。结果表明,杉木早材管胞纵向抗拉强度平均值为499 MPa,马尾松早材管胞平均值461 MPa;两种木材管胞在饱水态下的抗拉强度比气干态均较低;在160～220℃、1～3 h热处理条件下马尾松木材早材管胞纵向抗拉强度与素材相比有所降低。
In this paper,the longitudinal tensile strength of tracheids of Cunninghamia lanceolata and Pinus massoniana were evaluated using zero-span tensile test.The tensile strengths of wood tracheids with different moisture contents were compared,and the impact of the moisture on the tracheids＇ strength was discussed.In ad-dition,the longitudinal tensile strengths of the tracheids of heat-treated wood were determined,which were corre-lated with changes in the chemical composition,and cellulose crystallinity induced by heat treatment.The results showed that the average tracheid＇s longitudinal tensile strength of Chinese fir and Masson pine earlywood were 499 MPa and 461 MPa,respectively.The longitudinal tensile strengths of Chinese fir and Masson pine under the condition of water-saturated state were lower than those under the air-dry state,and the longitudinal tensile strength of Masson pine earlywood tracheids treated under the condition of 160～220℃ for 1～3 h were lower than that of non-heat treatment.
出处
《安徽农业大学学报》
CAS
CSCD
北大核心
2011年第4期491-495,共5页
Journal of Anhui Agricultural University
基金
国家自然科学基金项目(30730076)资助
关键词
马尾松
杉木
热处理
管胞
零距拉伸
抗拉强度
Masson pine
Chinese fir
heat treatment
tracheids
zero-span tensile test
tensile test
