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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。
Using Chinese fir and masson pine as test materials, the longitudinal tensile strength of tracheids was evaluated by zero-distance tensile technology. The differences of tracheid tensile strength under different water contents were compared, and the influence mechanism of water content was discussed. In addition, the effect of heat treatment on the longitudinal tensile strength of wood tracheids was mainly studied. The relationship between the changes of tracheid strength and the chemical composition and the crystallinity of cellulose was analyzed. The results showed that the average longitudinal tensile strength of Chinese earlywood tracheids was 499 MPa and that of Pinus massoniana was 461 MPa. The tensile strength of the two kinds of tracheids in the saturated state was lower than that in the dry state The longitudinal tensile strength of earlywood tracheids of Pinus massoniana decreased with the heat treatment at 160 ~ 220 ℃ for 1 ~ 3 h.